CVE-2025-40201

Advisory lineage Upstream: 0 Downstream: 27
Deferred
Published: 12 Nov 2025, 21:56
Last modified:11 May 2026, 21:44

Vulnerability Summary

Overall Risk (default)
minimal
0/100
CVSS Score
No data
EPSS Score
0.03% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 Nov 2025, 21:56
Published
Vulnerability first disclosed
11 May 2026, 21:44
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths The usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit() path is very broken. sys_prlimit64() does get_task_struct(tsk) but this only protects task_struct itself. If tsk != current and tsk is not a leader, this process can exit/exec and task_lock(tsk->group_leader) may use the already freed task_struct. Another problem is that sys_prlimit64() can race with mt-exec which changes ->group_leader. In this case do_prlimit() may take the wrong lock, or (worse) ->group_leader may change between task_lock() and task_unlock(). Change sys_prlimit64() to take tasklist_lock when necessary. This is not nice, but I don't see a better fix for -stable.

EPSS Trends

Current EPSS score: 0.03%• Percentile: 9%

Affected Systems

  • linux•linux

    ≥ 18c91bb2d87268d23868bf13508f5bc9cf04e89a, < 1bc0d9315ef5296abb2c9fd840336255850ded18 | ≥ 18c91bb2d87268d23868bf13508f5bc9cf04e89a, < 132f827e7bac7373e1522e89709d70b43cae5342 | ≥ 18c91bb2d87268d23868bf13508f5bc9cf04e89a, < 19b45c84bd9fd42fa97ff80c6350d604cb871c75 | ≥ 18c91bb2d87268d23868bf13508f5bc9cf04e89a, < 6796412decd2d8de8ec708213bbc958fab72f143 | ≥ 18c91bb2d87268d23868bf13508f5bc9cf04e89a, < a15f37a40145c986cdf289a4b88390f35efdecc4 | 5.18

References (5)