CVE-2025-39683

HighCVSS 7.1/10Last modified Oct 19, 2026

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness enumeration

CWE-125

Affected software

VendorProductVersions
LinuxLinux>= 634684d79733124f7470b226b0f42aada4426b07, < b842ef39c2ad6156c13afdec25ecc6792a9b67b9; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < 41b838420457802f21918df66764b6fbf829d330; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < 418b448e1d7470da9d4d4797f71782595ee69c49; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < 58ff8064cb4c7eddac4da1a59da039ead586950a; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < d0c68045b8b0f3737ed7bd6b8c83b7887014adee; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < 3079517a5ba80901fe828a06998da64b9b8749be; >= 8c9af478c06bb1ab1422f90d8ecbc53defd44bc3, < 6a909ea83f226803ea0e718f6e88613df9234d58; 24cd31752f47699b89b4b3471155c8e599a1a23a; e9cb474de7ff7a970c2a3951c12ec7e3113c0c35; 6ab671191f64b0da7d547e2ad4dc199ca7e5b558; 3d9281a4ac7171c808f9507f0937eb236b353905; 0b641b25870f02e2423e494365fc5243cc1e2759; ffd51dbfd2900e50c71b5c069fe407957e52d61f; cdd107d7f18158d966c2bc136204fe826dac445c; >= 5.10.36, < 5.10.241; >= 4.4.269, < 4.5; >= 4.9.269, < 4.10; >= 4.14.233, < 4.15; >= 4.19.191, < 4.20; >= 5.4.118, < 5.5
LinuxLinux5.13
SiemensSIMATIC CN 4100< V5.0
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.5, < *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *

References

Timeline

Published
Sep 5, 2025
Last modified
Oct 19, 2026
NVD status
Modified

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CVE-2025-39683: High severity, CVSS 7.1 | Vulnix