CVE-2025-37923

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-37923", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.969Z", "datePublished": "2025-05-20T15:21:51.927Z", "dateUpdated": "2026-08-05T11:58:24.005Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:58:24.005Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix oob write in trace_seq_to_buffer()\n\nsyzbot reported this bug:\n==================================================================\nBUG: KASAN: slab-out-of-bounds in trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\nBUG: KASAN: slab-out-of-bounds in tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\nWrite of size 4507 at addr ffff888032b6b000 by task syz.2.320/7260\n\nCPU: 1 UID: 0 PID: 7260 Comm: syz.2.320 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc3/0x670 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106\n trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\n tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\n ....\n==================================================================\n\nIt has been reported that trace_seq_to_buffer() tries to copy more data\nthan PAGE_SIZE to buf. Therefore, to prevent this, we should use the\nsmaller of trace_seq_used(&iter->seq) and PAGE_SIZE as an argument."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires opening `/sys/kernel/tracing/trace_pipe` (or a per-CPU variant) on the local system and issuing `splice(2)` against it. There is no network-facing path to `tracing_splice_read_pipe()`.\nAC:L - The overflow is deterministic and fully attacker-driven: generate more than one page of formatted trace output (a single ~4096-byte `trace_marker` record, or simply let `tracing_fill_pipe_page()` accumulate events up to the 8K trace_seq limit) and then splice from trace_pipe. No race, no memory-layout luck, and no non-default kernel config is needed.\nPR:L - `tracing_open_pipe()` contains no capability check whatsoever \u2014 reachability is gated only by DAC on the tracefs inode, and tracefs exposes `uid=`/`gid=`/`mode=` mount parameters precisely so a non-root group can be granted ftrace access. Android grants `shell`/atrace/Perfetto (`AID_READTRACEFS`) access to trace_pipe and distro/CI/observability deployments commonly chgrp the tracing tree, so an unprivileged local account reaches this path.\nUI:N - The attacker performs every step (open, generate trace data, splice) from its own process. No victim action or interaction is required.\nS:U - The out-of-bounds write and disclosure occur within kernel memory under the same security authority as the kernel itself; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Before the fix `spd.partial[i].len` was set to `trace_seq_used()` (up to ~8152) for a 4096-byte page, so `splice_to_pipe()` returns a pipe buffer that lets userspace read roughly 4KB of adjacent kernel memory directly \u2014 an arbitrary-content kernel infoleak, on top of the OOB write's exploitability for further disclosure.\nI:H - `trace_seq_to_buffer()` memcpy's up to ~4056 bytes past the end of a freshly allocated order-0 page into adjacent kernel memory, with largely attacker-chosen content (e.g. arbitrary bytes injected via `trace_marker`). A ~4KB controlled linear-map overflow with attacker-groomable neighbours is a strong write primitive suitable for control-flow hijacking.\nA:H - The overflow corrupts whatever kernel memory follows the page, reliably producing KASAN splats, oopses, or panics as reported by syzbot, and it can be re-triggered at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace.c"], "versions": [{"version": "3c56819b14b00dd449bd776303e61f8532fad09f", "lessThan": "f4b0174e9f18aaba59ee6ffdaf8827a7f94eb606", "status": "affected", "versionType": "git"}, {"version": "3c56819b14b00dd449bd776303e61f8532fad09f", "lessThan": "665ce421041890571852422487f4c613d1824ba9", "status": "affected", "versionType": "git"}, {"version": "3c56819b14b00dd449bd776303e61f8532fad09f", "lessThan": "1a3f9482b50b74fa9421bff8ceecfefd0dc06f8f", "status": "affected", 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in trace_seq_to_buffer()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:57:21.994Z"}}]}}

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"FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix oob write in trace_seq_to_buffer()\n\nsyzbot reported this bug:\n==================================================================\nBUG: KASAN: slab-out-of-bounds in trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\nBUG: KASAN: slab-out-of-bounds in tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\nWrite of size 4507 at addr ffff888032b6b000 by task syz.2.320/7260\n\nCPU: 1 UID: 0 PID: 7260 Comm: syz.2.320 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc3/0x670 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106\n trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\n tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\n ....\n==================================================================\n\nIt has been reported that trace_seq_to_buffer() tries to copy more data\nthan PAGE_SIZE to buf. Therefore, to prevent this, we should use the\nsmaller of trace_seq_used(&iter->seq) and PAGE_SIZE as an argument."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rastreo: Se corrige la escritura fuera de los l\u00edmite en trace_seq_to_buffer() syzbot inform\u00f3 este error: ====================================================================== ERROR: KASAN: slab-out-of-bounds en trace_seq_to_buffer kernel/trace/trace.c:1830 [en l\u00ednea] ERROR: KASAN: slab-out-of-bounds en tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822 Escritura de tama\u00f1o 4507 en la direcci\u00f3n ffff888032b6b000 por tarea syz.2.320/7260 CPU: 1 UID: 0 PID: 7260 Comm: syz.2.320 No contaminado 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full) Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:94 [en l\u00ednea] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [en l\u00ednea] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [en l\u00ednea] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106 trace_seq_to_buffer kernel/trace/trace.c:1830 [en l\u00ednea] tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822 .... ===================================================================== Se ha informado que trace_seq_to_buffer() intenta copiar m\u00e1s datos que PAGE_SIZE a buf. Por lo tanto, para evitarlo, debemos usar el valor menor entre trace_seq_used(&amp;iter-&gt;seq) y PAGE_SIZE como argumento."}], "id": "CVE-2025-37923", "lastModified": "2026-07-30T06:22:34.017", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-20T16:15:28.930", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/056ebbddb8faf4ddf83d005454dd78fc25c2d897"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a3f9482b50b74fa9421bff8ceecfefd0dc06f8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f27a3e93b8d674b24b27fcdbc6f72743cd96c0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/441021e5b3c7d9bd1b963590652c415929f3b157"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/665ce421041890571852422487f4c613d1824ba9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c5d2b66c5ef5037b4b4360e5447605ff00ba1bd4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4b0174e9f18aaba59ee6ffdaf8827a7f94eb606"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f5178c41bb43444a6008150fe6094497135d07cb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tracing: Fix oob write in trace_seq_to_buffer()", "id": "2367503", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367503"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Fix oob write in trace_seq_to_buffer()\nsyzbot reported this bug:\n==================================================================\nBUG: KASAN: slab-out-of-bounds in trace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\nBUG: KASAN: slab-out-of-bounds in tracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\nWrite of size 4507 at addr ffff888032b6b000 by task syz.2.320/7260\nCPU: 1 UID: 0 PID: 7260 Comm: syz.2.320 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:94 [inline]\ndump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\nprint_address_description mm/kasan/report.c:408 [inline]\nprint_report+0xc3/0x670 mm/kasan/report.c:521\nkasan_report+0xe0/0x110 mm/kasan/report.c:634\ncheck_region_inline mm/kasan/generic.c:183 [inline]\nkasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n__asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106\ntrace_seq_to_buffer kernel/trace/trace.c:1830 [inline]\ntracing_splice_read_pipe+0x6be/0xdd0 kernel/trace/trace.c:6822\n....\n==================================================================\nIt has been reported that trace_seq_to_buffer() tries to copy more data\nthan PAGE_SIZE to buf. Therefore, to prevent this, we should use the\nsmaller of trace_seq_used(&iter->seq) and PAGE_SIZE as an argument."], "name": "CVE-2025-37923", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37923\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37923\nhttps://lore.kernel.org/linux-cve-announce/2025052003-CVE-2025-37923-1bbf@gregkh/T"], "statement": "A bounds check was missing in trace_seq_to_buffer(), leading to a possible out-of-bounds write. Exploitable only by privileged users through tracing interfaces. Potential for kernel crash (DoS).", "threat_severity": "Moderate"}

{"created": "2025-06-27T09:26:51.176218+00:00", "updated": "2025-06-27T09:26:51.176267+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}