{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39683", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.113Z", "datePublished": "2025-09-05T17:20:49.821Z", "dateUpdated": "2026-08-05T12:04:32.439Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:04:32.439Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Limit access to parser->buffer when trace_get_user failed\n\nWhen the length of the string written to set_ftrace_filter exceeds\nFTRACE_BUFF_MAX, the following KASAN alarm will be triggered:\n\nBUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0\nRead of size 1 at addr ffff0000d00bd5ba by task ash/165\n\nCPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty\nHardware name: linux,dummy-virt (DT)\nCall trace:\n show_stack+0x34/0x50 (C)\n dump_stack_lvl+0xa0/0x158\n print_address_description.constprop.0+0x88/0x398\n print_report+0xb0/0x280\n kasan_report+0xa4/0xf0\n __asan_report_load1_noabort+0x20/0x30\n strsep+0x18c/0x1b0\n ftrace_process_regex.isra.0+0x100/0x2d8\n ftrace_regex_release+0x484/0x618\n __fput+0x364/0xa58\n ____fput+0x28/0x40\n task_work_run+0x154/0x278\n do_notify_resume+0x1f0/0x220\n el0_svc+0xec/0xf0\n el0t_64_sync_handler+0xa0/0xe8\n el0t_64_sync+0x1ac/0x1b0\n\nThe reason is that trace_get_user will fail when processing a string\nlonger than FTRACE_BUFF_MAX, but not set the end of parser->buffer to 0.\nThen an OOB access will be triggered in ftrace_regex_release->\nftrace_process_regex->strsep->strpbrk. We can solve this problem by\nlimiting access to parser->buffer when trace_get_user failed." } ], "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 local access to write and then close the tracefs file /sys/kernel/tracing/set_ftrace_filter (or set_ftrace_notrace / set_graph_function); there is no remote or adjacent-network path to trace_get_user().\nAC:L - A single deterministic sequence — open the filter file, write one token longer than FTRACE_BUFF_MAX (670), close it — always leaves the parser buffer unterminated and drives strsep() past the allocation; the heap slack that determines how far the over-read runs is itself groomable by the attacker via ordinary kmalloc-1024 spray/free.\nPR:L - The kernel imposes no capability check on ftrace_regex_open/write/release — access is gated purely by tracefs file permissions, and real deployments grant them to unprivileged users (Android chowns the ftrace filter files to the shell user for \"atrace -k\", and embedded/automotive/ChromeOS images mount tracefs with gid= for a tracing group).\nUI:N - The attacker triggers everything itself; the OOB access happens in ftrace_regex_release() during the attacker's own close()/exit, with no victim action required.\nS:U - The over-read and NUL over-write stay within kernel slab memory in the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - strpbrk() reads an unbounded amount of heap memory past the 670-byte allocation until it happens to hit a ':' or NUL, and the bytes it traverses influence the subsequent command strcmp/dispatch, so this is an unbounded out-of-bounds read of adjacent slab objects rather than a strictly bounded few-byte over-read.\nI:H - When the ':' delimiter is located outside the allocation, strsep() executes *end++ = '\\0', writing a NUL byte out of bounds into a neighbouring heap object at an offset the attacker can influence through heap grooming — a classic single-null-byte heap-corruption primitive usable to corrupt adjacent object metadata.\nA:H - The unterminated-string walk produces a KASAN slab-out-of-bounds report (panic under panic_on_warn) and can run off the end of the slab page into unmapped memory, causing a kernel oops; the resulting adjacent-object corruption can also crash the kernel later." } ] } ], "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", "kernel/trace/trace.h" ], "versions": [ { "version": "634684d79733124f7470b226b0f42aada4426b07", "lessThan": "b842ef39c2ad6156c13afdec25ecc6792a9b67b9", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "41b838420457802f21918df66764b6fbf829d330", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "418b448e1d7470da9d4d4797f71782595ee69c49", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "58ff8064cb4c7eddac4da1a59da039ead586950a", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "d0c68045b8b0f3737ed7bd6b8c83b7887014adee", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "3079517a5ba80901fe828a06998da64b9b8749be", "status": "affected", "versionType": "git" }, { "version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3", "lessThan": "6a909ea83f226803ea0e718f6e88613df9234d58", "status": "affected", "versionType": "git" }, { "version": "24cd31752f47699b89b4b3471155c8e599a1a23a", "status": "affected", "versionType": "git" }, { "version": "e9cb474de7ff7a970c2a3951c12ec7e3113c0c35", "status": "affected", "versionType": "git" }, { "version": "6ab671191f64b0da7d547e2ad4dc199ca7e5b558", "status": "affected", "versionType": "git" }, { "version": "3d9281a4ac7171c808f9507f0937eb236b353905", "status": "affected", "versionType": "git" }, { "version": "0b641b25870f02e2423e494365fc5243cc1e2759", "status": "affected", "versionType": "git" }, { "version": "ffd51dbfd2900e50c71b5c069fe407957e52d61f", "status": "affected", "versionType": "git" }, { "version": "cdd107d7f18158d966c2bc136204fe826dac445c", "status": "affected", "versionType": "git" }, { "version": "5.10.36", "lessThan": "5.10.241", "status": "affected", "versionType": "semver" }, { "version": "4.4.269", "lessThan": "4.5", "status": "affected", "versionType": "semver" }, { "version": "4.9.269", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.233", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.191", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.118", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.11.20", "lessThan": "5.12", "status": "affected", "versionType": "semver" }, { "version": "5.12.3", "lessThan": "5.13", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/trace/trace.c", "kernel/trace/trace.h" ], "versions": [ { "version": "5.13", "status": "affected" }, { "version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.149", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.103", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.44", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.4", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "5.10.36", "versionEndExcluding": "5.10.241" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.15.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.149" }, { "vulnerable": true, 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"url": "https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58" } ], "title": "tracing: Limit access to parser->buffer when trace_get_user failed", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:42:15.575Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:42:36.864Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [ { "status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html" } ] } ] } }