tracing: Limit access to parser->buffer when trace_get_user failed
In the Linux kernel, the following vulnerability has been resolved: tracing: Limit access to parser->buffer when trace_get_user failed When the length of the string written to set_ftrace_filter exceeds FTRACE_BUFF_MAX, the following KASAN alarm will be triggered: BUG: KASAN: slab-out-of-bounds in strsep+0x18c/0x1b0 Read of size 1 at addr ffff0000d00bd5ba by task ash/165 CPU: 1 UID: 0 PID: 165 Comm: ash Not tainted 6.16.0-g6bcdbd62bd56-dirty Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x34/0x50 (C) dump_stack_lvl+0xa0/0x158 print_address_description.constprop.0+0x88/0x398 print_report+0xb0/0x280 kasan_report+0xa4/0xf0 __asan_report_load1_noabort+0x20/0x30 strsep+0x18c/0x1b0 ftrace_process_regex.isra.0+0x100/0x2d8 ftrace_regex_release+0x484/0x618 __fput+0x364/0xa58 ____fput+0x28/0x40 task_work_run+0x154/0x278 do_notify_resume+0x1f0/0x220 el0_svc+0xec/0xf0 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x1ac/0x1b0 The reason is that trace_get_user will fail when processing a string longer than FTRACE_BUFF_MAX, but not set the end of parser->buffer to 0. Then an OOB access will be triggered in ftrace_regex_release-> ftrace_process_regex->strsep->strpbrk. We can solve this problem by limiting access to parser->buffer when trace_get_user failed.
CVE-2025-39683
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-39683
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "634684d79733124f7470b226b0f42aada4426b07",
"lessThan": "b842ef39c2ad6156c13afdec25ecc6792a9b67b9",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "41b838420457802f21918df66764b6fbf829d330",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "418b448e1d7470da9d4d4797f71782595ee69c49",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "58ff8064cb4c7eddac4da1a59da039ead586950a",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "d0c68045b8b0f3737ed7bd6b8c83b7887014adee",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "3079517a5ba80901fe828a06998da64b9b8749be",
"versionType": "git"
},
{
"status": "affected",
"version": "8c9af478c06bb1ab1422f90d8ecbc53defd44bc3",
"lessThan": "6a909ea83f226803ea0e718f6e88613df9234d58",
"versionType": "git"
},
{
"status": "affected",
"version": "24cd31752f47699b89b4b3471155c8e599a1a23a",
"versionType": "git"
},
{
"status": "affected",
"version": "e9cb474de7ff7a970c2a3951c12ec7e3113c0c35",
"versionType": "git"
},
{
"status": "affected",
"version": "6ab671191f64b0da7d547e2ad4dc199ca7e5b558",
"versionType": "git"
},
{
"status": "affected",
"version": "3d9281a4ac7171c808f9507f0937eb236b353905",
"versionType": "git"
},
{
"status": "affected",
"version": "0b641b25870f02e2423e494365fc5243cc1e2759",
"versionType": "git"
},
{
"status": "affected",
"version": "ffd51dbfd2900e50c71b5c069fe407957e52d61f",
"versionType": "git"
},
{
"status": "affected",
"version": "cdd107d7f18158d966c2bc136204fe826dac445c",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.36",
"lessThan": "5.10.241",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.4.269",
"lessThan": "4.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.9.269",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.14.233",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.191",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.118",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.11.20",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.12.3",
"lessThan": "5.13",
"versionType": "semver"
}
],
"programFiles": [
"kernel/trace/trace.c",
"kernel/trace/trace.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.241",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.44",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.4",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/trace.c",
"kernel/trace/trace.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39683
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30617 · Revision 1
- Added to Heist Feed
- Publisher date