CVE-2025-40201
NoneCVSS
—
EPSS
0.2%
Published
Nov 12, 2025
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Linux | Kernel | 5.18.0 | 6.1.157 |
| openSUSE:Leap 16.0 | dtb-aarch64 | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-64kb | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-default | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-default-base | 0 | 6.12.0-160000.8.1.160000.2.5 |
| openSUSE:Leap 16.0 | kernel-docs | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-rt | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-source | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-syms | 0 | 6.12.0-160000.8.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | 0 | 6.12.0-160000.8.1 |
Related vulnerabilities
- CVE-2026-23226 In the Linux kernel, the following vulnerability has been resolved: ksmbd: add chann_lock… Also affects Kernel
- CVE-2026-23225 In the Linux kernel, the following vulnerability has been resolved: sched/mmcid: Don't… Also affects Kernel
- CVE-2026-23230 In the Linux kernel, the following vulnerability has been resolved: smb: client: split… Also affects Kernel
- CVE-2026-23224 In the Linux kernel, the following vulnerability has been resolved: erofs: fix UAF issue… Also affects Kernel
- CVE-2026-23227 In the Linux kernel, the following vulnerability has been resolved: drm/exynos: vidi: use… Also affects Kernel
- CVE-2026-23223 In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in… Also affects Kernel
- CVE-2026-23228 In the Linux kernel, the following vulnerability has been resolved: smb: server: fix leak… Also affects Kernel
- CVE-2026-23229 In the Linux kernel, the following vulnerability has been resolved: crypto: virtio - Add… Also affects Kernel