CVE-2021-47219

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47219", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.528Z", "datePublished": "2024-04-10T19:01:57.694Z", "dateUpdated": "2026-08-05T08:46:46.676Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:46.676Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()\n\nThe following issue was observed running syzkaller:\n\nBUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]\nBUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nRead of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815\n\nCPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0xe4/0x14a lib/dump_stack.c:118\n print_address_description+0x73/0x280 mm/kasan/report.c:253\n kasan_report_error mm/kasan/report.c:352 [inline]\n kasan_report+0x272/0x370 mm/kasan/report.c:410\n memcpy+0x1f/0x50 mm/kasan/kasan.c:302\n memcpy include/linux/string.h:377 [inline]\n sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\n fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021\n resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772\n schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429\n scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835\n scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896\n scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034\n __blk_run_queue_uncond block/blk-core.c:464 [inline]\n __blk_run_queue+0x1a4/0x380 block/blk-core.c:484\n blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78\n sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847\n sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716\n sg_write+0x64/0xa0 drivers/scsi/sg.c:622\n __vfs_write+0xed/0x690 fs/read_write.c:485\nkill_bdev:block_device:00000000e138492c\n vfs_write+0x184/0x4c0 fs/read_write.c:549\n ksys_write+0x107/0x240 fs/read_write.c:599\n do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293\n entry_SYSCALL_64_after_hwframe+0x49/0xbe\n\nWe get 'alen' from command its type is int. If userspace passes a large\nlength we will get a negative 'alen'.\n\nSwitch n, alen, and rlen to u32."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via local sg write/SG_IO on a scsi_debug /dev/sg device (sg_write \u2192 scsi_debug_queuecommand \u2192 resp_report_tgtpgs); scsi_debug is a host-side pseudo HBA and is not network-facing.\nAC:L - An attacker who can open the scsi_debug sg device can deterministically trigger the OOB by sending MAINTENANCE IN / REPORT TARGET PORT GROUPS with a CDB allocation length that has the high bit set, making signed alen negative; no race or unmanaged condition is required.\nPR:L - Once scsi_debug is loaded, MAINTENANCE_IN is permitted by scsi_cmd_allowed() without CAP_SYS_RAWIO to any process that can open /dev/sg* (e.g. disk-group membership), matching prior scsi_debug SG_IO scorings; full root is not required.\nUI:N - The attacker triggers the fault entirely by issuing their own write/SG_IO with a crafted CDB; no separate victim action is needed.\nS:U - Impact is confined to a kernel OOB read/oops within the same host OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Negative alen causes fill_from_dev_buffer()/sg_copy_from_buffer() to over-read past the 1412-byte kzalloc response buffer into adjacent slab memory and copy that data into the attacker-controlled SG data-in buffer, enabling substantial kernel memory disclosure.\nI:N - The corrupted length only drives sg_copy_from_buffer() (kernel-to-user read); there is no out-of-bounds write or other integrity/control-flow primitive in this path.\nA:H - With a large attacker-chosen DXFER length, the over-read can extend past mapped heap into a guard or unmapped page and cause a kernel oops/panic, fully disrupting availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/scsi/scsi_debug.c"], "versions": [{"version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "8440377e1a5644779b4c8d013aa2a917f5fc83c3", "status": "affected", "versionType": "git"}, {"version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "66523553fa62c7878fc5441dc4e82be71934eb77", "status": "affected", "versionType": "git"}, {"version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "f347c26836c270199de1599c3cd466bb7747caa9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/scsi/scsi_debug.c"], "versions": [{"version": "2.6.19", "status": "affected"}, {"version": "0", "lessThan": "2.6.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.82", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.10.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.15.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3"}, {"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77"}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9"}], "title": "scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47219", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-10T19:49:13.779675Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:14:05.479Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.367Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.367Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47219", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-10T19:49:13.779675Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:01:23.138Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.1, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via local sg write/SG_IO on a scsi_debug /dev/sg device (sg_write \u2192 scsi_debug_queuecommand \u2192 resp_report_tgtpgs); scsi_debug is a host-side pseudo HBA and is not network-facing.\nAC:L - An attacker who can open the scsi_debug sg device can deterministically trigger the OOB by sending MAINTENANCE IN / REPORT TARGET PORT GROUPS with a CDB allocation length that has the high bit set, making signed alen negative; no race or unmanaged condition is required.\nPR:L - Once scsi_debug is loaded, MAINTENANCE_IN is permitted by scsi_cmd_allowed() without CAP_SYS_RAWIO to any process that can open /dev/sg* (e.g. disk-group membership), matching prior scsi_debug SG_IO scorings; full root is not required.\nUI:N - The attacker triggers the fault entirely by issuing their own write/SG_IO with a crafted CDB; no separate victim action is needed.\nS:U - Impact is confined to a kernel OOB read/oops within the same host OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:H - Negative alen causes fill_from_dev_buffer()/sg_copy_from_buffer() to over-read past the 1412-byte kzalloc response buffer into adjacent slab memory and copy that data into the attacker-controlled SG data-in buffer, enabling substantial kernel memory disclosure.\nI:N - The corrupted length only drives sg_copy_from_buffer() (kernel-to-user read); there is no out-of-bounds write or other integrity/control-flow primitive in this path.\nA:H - With a large attacker-chosen DXFER length, the over-read can extend past mapped heap into a guard or unmapped page and cause a kernel oops/panic, fully disrupting availability."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "8440377e1a5644779b4c8d013aa2a917f5fc83c3", "versionType": "git"}, {"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "66523553fa62c7878fc5441dc4e82be71934eb77", "versionType": "git"}, {"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "f347c26836c270199de1599c3cd466bb7747caa9", "versionType": "git"}], "programFiles": ["drivers/scsi/scsi_debug.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.82", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.5", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/scsi/scsi_debug.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3"}, {"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77"}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()\n\nThe following issue was observed running syzkaller:\n\nBUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]\nBUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nRead of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815\n\nCPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0xe4/0x14a lib/dump_stack.c:118\n print_address_description+0x73/0x280 mm/kasan/report.c:253\n kasan_report_error mm/kasan/report.c:352 [inline]\n kasan_report+0x272/0x370 mm/kasan/report.c:410\n memcpy+0x1f/0x50 mm/kasan/kasan.c:302\n memcpy include/linux/string.h:377 [inline]\n sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\n fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021\n resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772\n schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429\n scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835\n scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896\n scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034\n __blk_run_queue_uncond block/blk-core.c:464 [inline]\n __blk_run_queue+0x1a4/0x380 block/blk-core.c:484\n blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78\n sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847\n sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716\n sg_write+0x64/0xa0 drivers/scsi/sg.c:622\n __vfs_write+0xed/0x690 fs/read_write.c:485\nkill_bdev:block_device:00000000e138492c\n vfs_write+0x184/0x4c0 fs/read_write.c:549\n ksys_write+0x107/0x240 fs/read_write.c:599\n do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293\n entry_SYSCALL_64_after_hwframe+0x49/0xbe\n\nWe get 'alen' from command its type is int. If userspace passes a large\nlength we will get a negative 'alen'.\n\nSwitch n, alen, and rlen to u32."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.82", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.5", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "2.6.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:46.676Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47219", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:46:46.676Z", "dateReserved": "2024-04-10T18:59:19.528Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-10T19:01:57.694Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/scsi/scsi_debug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8440377e1a5644779b4c8d013aa2a917f5fc83c3", "status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "versionType": "git"}, {"lessThan": "66523553fa62c7878fc5441dc4e82be71934eb77", "status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "versionType": "git"}, {"lessThan": "f347c26836c270199de1599c3cd466bb7747caa9", "status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/scsi/scsi_debug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"lessThan": "2.6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.82", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "49103CD7-A3F7-441A-AAF4-11B8B707979D", "versionEndExcluding": "5.10.82", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2128A085-4C0C-4C1E-9E9C-0DD868E2170F", "versionEndExcluding": "5.15.5", "versionStartIncluding": "5.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()\n\nThe following issue was observed running syzkaller:\n\nBUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]\nBUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nRead of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815\n\nCPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0xe4/0x14a lib/dump_stack.c:118\n print_address_description+0x73/0x280 mm/kasan/report.c:253\n kasan_report_error mm/kasan/report.c:352 [inline]\n kasan_report+0x272/0x370 mm/kasan/report.c:410\n memcpy+0x1f/0x50 mm/kasan/kasan.c:302\n memcpy include/linux/string.h:377 [inline]\n sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\n fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021\n resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772\n schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429\n scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835\n scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896\n scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034\n __blk_run_queue_uncond block/blk-core.c:464 [inline]\n __blk_run_queue+0x1a4/0x380 block/blk-core.c:484\n blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78\n sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847\n sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716\n sg_write+0x64/0xa0 drivers/scsi/sg.c:622\n __vfs_write+0xed/0x690 fs/read_write.c:485\nkill_bdev:block_device:00000000e138492c\n vfs_write+0x184/0x4c0 fs/read_write.c:549\n ksys_write+0x107/0x240 fs/read_write.c:599\n do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293\n entry_SYSCALL_64_after_hwframe+0x49/0xbe\n\nWe get 'alen' from command its type is int. If userspace passes a large\nlength we will get a negative 'alen'.\n\nSwitch n, alen, and rlen to u32."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: scsi_debug: Corregir lectura fuera de los l\u00edmites en resp_report_tgtpgs() Se observ\u00f3 el siguiente problema al ejecutar syzkaller: ERROR: KASAN: slab-out-of-bounds en memcpy include/linux/string.h:377 [en l\u00ednea] ERROR: KASAN: slab-out-of-bounds en sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831 Lectura de tama\u00f1o 2132 en la direcci\u00f3n ffff8880aea95dc8 por la tarea syz-executor.0/9815 CPU: 0 PID: 9815 Comm: syz-executor.0 No contaminado 4.19.202-00874-gfc0fe04215a9 #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 01/04/2014 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:77 [en l\u00ednea] dump_stack+0xe4/0x14a lib/dump_stack.c:118 print_address_description+0x73/0x280 mm/kasan/report.c:253 kasan_report_error mm/kasan/report.c:352 [en l\u00ednea] kasan_report+0x272/0x370 mm/kasan/report.c:410 memcpy+0x1f/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:377 [en l\u00ednea] sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831 rellenar_desde_buffer_dev+0x14f/0x340 drivers/scsi/scsi_debug.c:1021 resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772 schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429 scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835 scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896 scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034 __blk_run_queue_uncond bloque/blk-core.c:464 [en l\u00ednea] __blk_run_queue+0x1a4/0x380 bloque/blk-core.c:484 blk_execute_rq_nowait+0x1c2/0x2d0 bloque/blk-exec.c:78 sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847 sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716 sg_write+0x64/0xa0 drivers/scsi/sg.c:622 __vfs_write+0xed/0x690 fs/read_write.c:485 kill_bdev:block_device:00000000e138492c vfs_write+0x184/0x4c0 fs/read_write.c:549 ksys_write+0x107/0x240 fs/read_write.c:599 do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Obtenemos 'alen' del comando, su tipo es int. Si el espacio de usuario pasa una longitud grande, obtendremos un 'alen' negativo. Cambie n, alen y rlen a u32."}], "id": "CVE-2021-47219", "lastModified": "2026-08-04T10:16:53.023", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47219", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-10T19:49:13.779675Z", "version": "2.0.3"}}]}, "published": "2024-04-10T19:15:48.903", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()", "id": "2274567", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2274567"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nscsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()\nThe following issue was observed running syzkaller:\nBUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]\nBUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nRead of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815\nCPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nCall Trace:\n__dump_stack lib/dump_stack.c:77 [inline]\ndump_stack+0xe4/0x14a lib/dump_stack.c:118\nprint_address_description+0x73/0x280 mm/kasan/report.c:253\nkasan_report_error mm/kasan/report.c:352 [inline]\nkasan_report+0x272/0x370 mm/kasan/report.c:410\nmemcpy+0x1f/0x50 mm/kasan/kasan.c:302\nmemcpy include/linux/string.h:377 [inline]\nsg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nfill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021\nresp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772\nschedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429\nscsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835\nscsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896\nscsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034\n__blk_run_queue_uncond block/blk-core.c:464 [inline]\n__blk_run_queue+0x1a4/0x380 block/blk-core.c:484\nblk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78\nsg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847\nsg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716\nsg_write+0x64/0xa0 drivers/scsi/sg.c:622\n__vfs_write+0xed/0x690 fs/read_write.c:485\nkill_bdev:block_device:00000000e138492c\nvfs_write+0x184/0x4c0 fs/read_write.c:549\nksys_write+0x107/0x240 fs/read_write.c:599\ndo_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293\nentry_SYSCALL_64_after_hwframe+0x49/0xbe\nWe get 'alen' from command its type is int. If userspace passes a large\nlength we will get a negative 'alen'.\nSwitch n, alen, and rlen to u32.", "A vulnerability was found in the Linux kernel, related to the Small Computer System Interface (SCSI) subsystem. This issue involves an out-of-bounds read in the scsi_debug driver, which could allow an attacker to trigger a denial of service (DoS). This issue occurs during the handling of certain SCSI commands, leading to a system crash when invalid input lengths are passed. This vulnerability was patched in later kernel updates\u200b."], "name": "CVE-2021-47219", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47219\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47219\nhttps://lore.kernel.org/linux-cve-announce/2024041006-CVE-2021-47219-c09e@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:11.257027+00:00", "updated": "2025-07-12T22:31:11.257093+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}