CVE-2025-40201

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Source
https://cve.org/CVERecord?id=CVE-2025-40201
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40201.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-40201
Downstream
Related
Published
2025-11-12T21:56:34Z
Modified
2026-08-12T03:51:48Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40201.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
18c91bb2d87268d23868bf13508f5bc9cf04e89a
Fixed
1bc0d9315ef5296abb2c9fd840336255850ded18
Fixed
132f827e7bac7373e1522e89709d70b43cae5342
Fixed
19b45c84bd9fd42fa97ff80c6350d604cb871c75
Fixed
6796412decd2d8de8ec708213bbc958fab72f143
Fixed
a15f37a40145c986cdf289a4b88390f35efdecc4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40201.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.18.0
Fixed
6.1.157
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.113
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.54
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.17.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40201.json"