CVE-2025-39683 - CVE House
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Status published Unknown CVE-2025-39683

tracing: Limit access to parser->buffer when trace_get_user failed

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
634684d79733124f7470b226b0f42aada4426b07, 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, 24cd31752f47699b89b4b3471155c8e599a1a23a, e9cb474de7ff7a970c2a3951c12ec7e3113c0c35, 6ab671191f64b0da7d547e2ad4dc199ca7e5b558, 3d9281a4ac7171c808f9507f0937eb236b353905, 0b641b25870f02e2423e494365fc5243cc1e2759, ffd51dbfd2900e50c71b5c069fe407957e52d61f, cdd107d7f18158d966c2bc136204fe826dac445c, 5.10.36, 4.4.269, 4.9.269, 4.14.233, 4.19.191, 5.4.118, 5.11.20, 5.12.3, 5.13, 0, 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17

Timeline

Official Publish: September 5th, 2025
Last Modified: July 14th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.