CVE-2025-39683

HIGH EPSS 5.9%
Published Sep 5, 20259mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Sep 5, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥4.4.269  –  <4.5
linuxlinux_kernel*≥4.9.269  –  <4.10
linuxlinux_kernel*≥4.14.233  –  <4.15
linuxlinux_kernel*≥4.19.191  –  <4.20
linuxlinux_kernel*≥5.4.118  –  <5.5
linuxlinux_kernel*≥5.10.36  –  <5.10.241
linuxlinux_kernel*≥5.11.20  –  <5.12
linuxlinux_kernel*≥5.12.3  –  <5.15.190
linuxlinux_kernel*≥5.16  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 11

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
  • git.kernel.org https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3079517a5ba80901fe828a06998da64b9b8749be
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/418b448e1d7470da9d4d4797f71782595ee69c49
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/41b838420457802f21918df66764b6fbf829d330
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58ff8064cb4c7eddac4da1a59da039ead586950a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a909ea83f226803ea0e718f6e88613df9234d58
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b842ef39c2ad6156c13afdec25ecc6792a9b67b9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d0c68045b8b0f3737ed7bd6b8c83b7887014adee
    Patch