{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-47716", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.949Z", "datePublished": "2024-10-21T11:53:47.434Z", "dateUpdated": "2024-11-05T09:49:21.275Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-05T09:49:21.275Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n BUG: unsupported FP instruction in kernel mode\n FPEXC == 0xc0000780\n Internal error: Oops - undefined instruction: 0 [#1] ARM\n CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n Hardware name: BCM2835\n PC is at vfp_support_entry+0xc8/0x2cc\n LR is at do_undefinstr+0xa8/0x250\n pc : [<c0101d50>] lr : [<c010a80c>] psr: a0000013\n sp : dc8d1f68 ip : 60000013 fp : bedea19c\n r10: ec532b17 r9 : 00000010 r8 : 0044766c\n r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\n r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\n Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\n Control: 00c5387d Table: 0251c008 DAC: 00000051\n Register r0 information: non-paged memory\n Register r1 information: vmalloc memory\n Register r2 information: non-slab/vmalloc memory\n Register r3 information: non-slab/vmalloc memory\n Register r4 information: 2-page vmalloc region\n Register r5 information: slab kmalloc-cg-2k\n Register r6 information: vmalloc memory\n Register r7 information: non-slab/vmalloc memory\n Register r8 information: non-paged memory\n Register r9 information: zero-size pointer\n Register r10 information: vmalloc memory\n Register r11 information: non-paged memory\n Register r12 information: non-paged memory\n Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n Stack: (0xdc8d1f68 to 0xdc8d2000)\n 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n Call trace:\n [<c0101d50>] (vfp_support_entry) from [<c010a80c>] (do_undefinstr+0xa8/0x250)\n [<c010a80c>] (do_undefinstr) from [<c0100f10>] (__und_usr+0x70/0x80)\n Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n 1fa0: b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n #include <stdio.h>\n #include <math.h>\n\n int main(void)\n {\n double v = 1.0;\n printf(\"%fn\", NAN + *(volatile double *)&v);\n return 0;\n }\n\nAnother way to consistently trigger the oops is:\n\n calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n VFP: bounce: trigger ec532b17 fpexc c0000780\n VFP: emulate: INST=0xee377b06 SCR=0x00000000\n VFP: bounce: trigger eef1fa10 fpexc c0000780\n VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n VFP: raising exceptions 30000000\n\n calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\n vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\n vmlinux.llvm.good [0xc0101d20\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm/vfp/vfpinstr.h"], "versions": [{"version": "4708fb041346", "lessThan": "9fc60f2bdd43", "status": "affected", "versionType": "git"}, {"version": "4708fb041346", "lessThan": "cd595d87e5fd", "status": "affected", "versionType": "git"}, {"version": "4708fb041346", "lessThan": "39caf610a637", "status": "affected", "versionType": "git"}, {"version": "4708fb041346", "lessThan": "89a906dfa8c3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm/vfp/vfpinstr.h"], "versions": [{"version": "6.6", "status": "affected"}, {"version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f"}, {"url": "https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b"}, {"url": "https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a"}, {"url": "https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b"}], "title": "ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47716", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:02:37.747830Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:18.288Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47716", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:02:37.747830Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:02:40.761Z"}}], "cna": {"title": "ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4708fb041346", "lessThan": "9fc60f2bdd43", "versionType": "git"}, {"status": "affected", "version": "4708fb041346", "lessThan": "cd595d87e5fd", "versionType": "git"}, {"status": "affected", "version": "4708fb041346", "lessThan": "39caf610a637", "versionType": "git"}, {"status": "affected", "version": "4708fb041346", "lessThan": "89a906dfa8c3", "versionType": "git"}], "programFiles": ["arch/arm/vfp/vfpinstr.h"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"status": "unaffected", "version": "0", "lessThan": "6.6", "versionType": "custom"}, {"status": "unaffected", "version": "6.6.54", "versionType": "custom", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.13", "versionType": "custom", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11.2", "versionType": "custom", "lessThanOrEqual": "6.11.*"}, {"status": "unaffected", "version": "6.12-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["arch/arm/vfp/vfpinstr.h"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f"}, {"url": "https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b"}, {"url": "https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a"}, {"url": "https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b"}], "x_generator": {"engine": "bippy-c9c4e1df01b2"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n BUG: unsupported FP instruction in kernel mode\n FPEXC == 0xc0000780\n Internal error: Oops - undefined instruction: 0 [#1] ARM\n CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n Hardware name: BCM2835\n PC is at vfp_support_entry+0xc8/0x2cc\n LR is at do_undefinstr+0xa8/0x250\n pc : [<c0101d50>] lr : [<c010a80c>] psr: a0000013\n sp : dc8d1f68 ip : 60000013 fp : bedea19c\n r10: ec532b17 r9 : 00000010 r8 : 0044766c\n r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\n r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\n Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\n Control: 00c5387d Table: 0251c008 DAC: 00000051\n Register r0 information: non-paged memory\n Register r1 information: vmalloc memory\n Register r2 information: non-slab/vmalloc memory\n Register r3 information: non-slab/vmalloc memory\n Register r4 information: 2-page vmalloc region\n Register r5 information: slab kmalloc-cg-2k\n Register r6 information: vmalloc memory\n Register r7 information: non-slab/vmalloc memory\n Register r8 information: non-paged memory\n Register r9 information: zero-size pointer\n Register r10 information: vmalloc memory\n Register r11 information: non-paged memory\n Register r12 information: non-paged memory\n Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n Stack: (0xdc8d1f68 to 0xdc8d2000)\n 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n Call trace:\n [<c0101d50>] (vfp_support_entry) from [<c010a80c>] (do_undefinstr+0xa8/0x250)\n [<c010a80c>] (do_undefinstr) from [<c0100f10>] (__und_usr+0x70/0x80)\n Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n 1fa0: b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n #include <stdio.h>\n #include <math.h>\n\n int main(void)\n {\n double v = 1.0;\n printf(\"%fn\", NAN + *(volatile double *)&v);\n return 0;\n }\n\nAnother way to consistently trigger the oops is:\n\n calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n VFP: bounce: trigger ec532b17 fpexc c0000780\n VFP: emulate: INST=0xee377b06 SCR=0x00000000\n VFP: bounce: trigger eef1fa10 fpexc c0000780\n VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n VFP: raising exceptions 30000000\n\n calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\n vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\n vmlinux.llvm.good [0xc0101d20\n---truncated---"}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-10-21T11:53:47.434Z"}}}, "cveMetadata": {"cveId": "CVE-2024-47716", "state": "PUBLISHED", "dateUpdated": "2024-10-21T13:04:18.288Z", "dateReserved": "2024-09-30T16:00:12.949Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-10-21T11:53:47.434Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E729C51E-0317-4ABD-B95D-E6F8D80A17F6", "versionEndExcluding": "6.6.54", "versionStartIncluding": "6.6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CE94BB8D-B0AB-4563-9ED7-A12122B56EBE", "versionEndExcluding": "6.10.13", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AB755D26-97F4-43B6-8604-CD076811E181", "versionEndExcluding": "6.11.2", "versionStartIncluding": "6.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n BUG: unsupported FP instruction in kernel mode\n FPEXC == 0xc0000780\n Internal error: Oops - undefined instruction: 0 [#1] ARM\n CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n Hardware name: BCM2835\n PC is at vfp_support_entry+0xc8/0x2cc\n LR is at do_undefinstr+0xa8/0x250\n pc : [<c0101d50>] lr : [<c010a80c>] psr: a0000013\n sp : dc8d1f68 ip : 60000013 fp : bedea19c\n r10: ec532b17 r9 : 00000010 r8 : 0044766c\n r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\n r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\n Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\n Control: 00c5387d Table: 0251c008 DAC: 00000051\n Register r0 information: non-paged memory\n Register r1 information: vmalloc memory\n Register r2 information: non-slab/vmalloc memory\n Register r3 information: non-slab/vmalloc memory\n Register r4 information: 2-page vmalloc region\n Register r5 information: slab kmalloc-cg-2k\n Register r6 information: vmalloc memory\n Register r7 information: non-slab/vmalloc memory\n Register r8 information: non-paged memory\n Register r9 information: zero-size pointer\n Register r10 information: vmalloc memory\n Register r11 information: non-paged memory\n Register r12 information: non-paged memory\n Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n Stack: (0xdc8d1f68 to 0xdc8d2000)\n 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n Call trace:\n [<c0101d50>] (vfp_support_entry) from [<c010a80c>] (do_undefinstr+0xa8/0x250)\n [<c010a80c>] (do_undefinstr) from [<c0100f10>] (__und_usr+0x70/0x80)\n Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n 1fa0: b6f68af8 00448fc0 00000000 bedea188\n 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n #include <stdio.h>\n #include <math.h>\n\n int main(void)\n {\n double v = 1.0;\n printf(\"%fn\", NAN + *(volatile double *)&v);\n return 0;\n }\n\nAnother way to consistently trigger the oops is:\n\n calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n VFP: bounce: trigger ec532b17 fpexc c0000780\n VFP: emulate: INST=0xee377b06 SCR=0x00000000\n VFP: bounce: trigger eef1fa10 fpexc c0000780\n VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n VFP: raising exceptions 30000000\n\n calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\n vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\n vmlinux.llvm.good [0xc0101d20\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ARM: 9410/1: vfp: usar asm vol\u00e1til en macros fmrx/fmxr Las instrucciones de punto flotante en el espacio de usuario pueden bloquear algunos kernels de ARM creados con clang/LLD 17.0.6: ERROR: instrucci\u00f3n FP no compatible en modo kernel FPEXC == 0xc0000780 Error interno: Ups - instrucci\u00f3n no definida: 0 [#1] CPU ARM: 0 PID: 196 Comm: vfp-reproducer No contaminado 6.10.0 #1 Nombre del hardware: BCM2835 La PC est\u00e1 en vfp_support_entry+0xc8/0x2cc LR est\u00e1 en do_undefinstr+0xa8/0x250 pc : [] lr : [] psr: a0000013 sp : dc8d1f68 ip : 60000013 fp : bedea19c r10: ec532b17 r9 : 00000010 r8 : 0044766c r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0 r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c Indicadores: NzCv IRQ en FIQ en modo SVC_32 ISA ARM Segmento ninguno Control: 00c5387d Tabla: 0251c008 DAC: 00000051 Informaci\u00f3n del registro r0: Informaci\u00f3n del registro r1: memoria vmalloc Informaci\u00f3n del registro r2: memoria no slab/vmalloc Informaci\u00f3n del registro r3: memoria no slab/vmalloc Informaci\u00f3n del registro r4: regi\u00f3n vmalloc de 2 p\u00e1ginas Informaci\u00f3n del registro r5: slab kmalloc-cg-2k Informaci\u00f3n del registro r6: memoria vmalloc Informaci\u00f3n del registro r7: memoria no slab/vmalloc Informaci\u00f3n del registro r8: memoria no paginada Informaci\u00f3n del registro r9: puntero de tama\u00f1o cero Informaci\u00f3n del registro r10: memoria vmalloc Informaci\u00f3n del registro r11: memoria no paginada Informaci\u00f3n del registro r12: memoria no paginada Proceso vfp-reproducer (pid: 196, l\u00edmite de pila = 0x61aaaf8b) Pila: (0xdc8d1f68 a 0xdc8d2000) 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010 1fa0: ffffffff c1c13800 7d c0100f10 b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000 Seguimiento de llamadas: [] (vfp_support_entry) desde [] (do_undefinstr+0xa8/0x250) [] (do_undefinstr) desde [] (__und_usr+0x70/0x80) Pila de excepciones (0xdc8d1fb0 a 0xdc8d1ff8) 1fa0: b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff C\u00f3digo: 0a000061 e3877202 e594003c e3a09010 (eef16a10) ---[ fin del seguimiento 000000000000000 ]--- P\u00e1nico del kernel: no sincroniza: Excepci\u00f3n fatal en la interrupci\u00f3n ---[ fin del kernel: no sincroniza: Excepci\u00f3n fatal en la interrupci\u00f3n ]--- Este es un reproductor de espacio de usuario m\u00ednimo en una Raspberry Pi Zero W: #include #include int main(void) { double v = 1.0; printf(\"%fn\", NAN + *(volatile double *)&amp;v); return 0; } Otra forma de activar consistentemente el error es: calvin@raspberry-pi-zero-w ~$ python -c \"import json\" El error se reproduce solo cuando el kernel se construye con DYNAMIC_DEBUG=n, porque las llamadas pr_debug() act\u00faan como barreras incluso cuando no est\u00e1n activadas. Esta es la salida de la misma fuente del kernel creada con el mismo compilador y DYNAMIC_DEBUG=y, donde el reproductor de espacio de usuario funciona como se espera: VFP: bounce: trigger ec532b17 fpexc c0000780 VFP: emulate: INST=0xee377b06 SCR=0x00000000 VFP: bounce: trigger eef1fa10 fpexc c0000780 VFP: emulate: INST=0xeeb40b40 SCR=0x00000000 VFP: raising exceptions 30000000 calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer nan Buscar burdamente instrucciones vmsr/vmrs en el texto casi id\u00e9ntico de vfp_support_entry() hace que el problema sea obvio: vmlinux.llvm.good [0xc0101cb8] &lt;+48&gt;: vmrs r7, fpexc vmlinux.llvm.good [0xc0101cd8] &lt;+80&gt;: vmsr fpexc, r0 vmlinux.llvm.good [0xc0101d20 ---truncado---"}], "id": "CVE-2024-47716", "lastModified": "2024-10-24T14:34:17.863", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-10-21T12:15:07.943", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros", "id": "2320256", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320256"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\nBUG: unsupported FP instruction in kernel mode\nFPEXC == 0xc0000780\nInternal error: Oops - undefined instruction: 0 [#1] ARM\nCPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\nHardware name: BCM2835\nPC is at vfp_support_entry+0xc8/0x2cc\nLR is at do_undefinstr+0xa8/0x250\npc : [<c0101d50>] lr : [<c010a80c>] psr: a0000013\nsp : dc8d1f68 ip : 60000013 fp : bedea19c\nr10: ec532b17 r9 : 00000010 r8 : 0044766c\nr7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0\nr3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c\nFlags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none\nControl: 00c5387d Table: 0251c008 DAC: 00000051\nRegister r0 information: non-paged memory\nRegister r1 information: vmalloc memory\nRegister r2 information: non-slab/vmalloc memory\nRegister r3 information: non-slab/vmalloc memory\nRegister r4 information: 2-page vmalloc region\nRegister r5 information: slab kmalloc-cg-2k\nRegister r6 information: vmalloc memory\nRegister r7 information: non-slab/vmalloc memory\nRegister r8 information: non-paged memory\nRegister r9 information: zero-size pointer\nRegister r10 information: vmalloc memory\nRegister r11 information: non-paged memory\nRegister r12 information: non-paged memory\nProcess vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\nStack: (0xdc8d1f68 to 0xdc8d2000)\n1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\nCall trace:\n[<c0101d50>] (vfp_support_entry) from [<c010a80c>] (do_undefinstr+0xa8/0x250)\n[<c010a80c>] (do_undefinstr) from [<c0100f10>] (__und_usr+0x70/0x80)\nException stack(0xdc8d1fb0 to 0xdc8d1ff8)\n1fa0: b6f68af8 00448fc0 00000000 bedea188\n1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\nCode: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n---[ end trace 0000000000000000 ]---\nKernel panic - not syncing: Fatal exception in interrupt\n---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n#include <stdio.h>\n#include <math.h>\nint main(void)\n{\ndouble v = 1.0;\nprintf(\"%fn\", NAN + *(volatile double *)&v);\nreturn 0;\n}\nAnother way to consistently trigger the oops is:\ncalvin@raspberry-pi-zero-w ~$ python -c \"import json\"\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\nVFP: bounce: trigger ec532b17 fpexc c0000780\nVFP: emulate: INST=0xee377b06 SCR=0x00000000\nVFP: bounce: trigger eef1fa10 fpexc c0000780\nVFP: emulate: INST=0xeeb40b40 SCR=0x00000000\nVFP: raising exceptions 30000000\ncalvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\nnan\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\nvmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc\nvmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0\nvmlinux.llvm.good [0xc0101d20\n---truncated---"], "name": "CVE-2024-47716", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-47716\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-47716\nhttps://lore.kernel.org/linux-cve-announce/2024102120-CVE-2024-47716-72df@gregkh/T"], "threat_severity": "Moderate"}