CVE-2023-54019
- Source
- https://cve.org/CVERecord?id=CVE-2023-54019
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54019.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-54019
- Downstream
- Related
- Published
- 2025-12-24T10:55:49.840Z
- Modified
- 2026-02-04T04:31:55.749883Z
- Summary
- sched/psi: use kernfs polling functions for PSI trigger polling
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
sched/psi: use kernfs polling functions for PSI trigger polling
Destroying psi trigger in cgroupfilerelease causes UAF issues when a cgroup is removed from under a polling process. This is happening because cgroup removal causes a call to cgroupfilerelease while the actual file is still alive. Destroying the trigger at this point would also destroy its waitqueue head and if there is still a polling process on that file accessing the waitqueue, it will step on the freed pointer:
doselect vfspoll dormdir cgrouprmdir kernfsdrainopenfiles cgroupfilerelease cgrouppressurerelease psitriggerdestroy wakeuppollfree(&t->eventwait) // vfspoll is unblocked synchronizercu kfree(t) poll_freewait -> UAF access to the trigger's waitqueue head
Patch [1] fixed this issue for epoll() case using wakeuppollfree(), however the same issue exists for synchronous poll() case. The root cause of this issue is that the lifecycles of the psi trigger's waitqueue and of the file associated with the trigger are different. Fix this by using kernfsgenericpoll function when polling on cgroup-specific psi triggers. It internally uses kernfsopennode->poll waitqueue head with its lifecycle tied to the file's lifecycle. This also renders the fix in [1] obsolete, so revert it.
[1] commit c2dbe32d5db5 ("sched/psi: Fix use-after-free in epremovewait_queue()")
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54019.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/92cc0153324b6ae8577a39f5bf2cd83c9a34ea6a
- https://git.kernel.org/stable/c/aff037078ecaecf34a7c2afab1341815f90fba5e
- https://git.kernel.org/stable/c/d124ab17024cc85a1079b7810a018a497ebc13da
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54019.json
- https://nvd.nist.gov/vuln/detail/CVE-2023-54019
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
-
Introduced0e94682b73bfa6c44c98af7a26771c9c08c055d5Fixed92cc0153324b6ae8577a39f5bf2cd83c9a34ea6aFixedd124ab17024cc85a1079b7810a018a497ebc13daFixedaff037078ecaecf34a7c2afab1341815f90fba5e