CVE-2025-40201High· 7.8▾ TwilightIn 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() pa…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 18c91bb2d87268d23868bf13508f5bc9cf04e89a < 1bc0d9315ef5296abb2c9fd840336255850ded18Linux >= 18c91bb2d87268d23868bf13508f5bc9cf04e89a < 132f827e7bac7373e1522e89709d70b43cae5342Linux >= 18c91bb2d87268d23868bf13508f5bc9cf04e89a < 19b45c84bd9fd42fa97ff80c6350d604cb871c75Linux >= 18c91bb2d87268d23868bf13508f5bc9cf04e89a < 6796412decd2d8de8ec708213bbc958fab72f143Linux >= 18c91bb2d87268d23868bf13508f5bc9cf04e89a < a15f37a40145c986cdf289a4b88390f35efdecc4Linux 5.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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