sched_ext: Take cgroup_lock() first in scx_cgroup_lock()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74593
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:31 UTC
Updated2026-08-22 16:16:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Take cgroup_lock() first in scx_cgroup_lock() scx_cgroup_lock() write-locks scx_cgroup_ops_rwsem and then takes cgroup_lock(), which can deadlock through kernfs: scx enable/disable cgroup rmdir cpu.weight write ------------------ ------------ ---------------- cgroup_lock() percpu_down_write(rwsem) cgroup_lock() kernfs_get_active() percpu_down_read(rwsem) kernfs_drain() The enable path waits for the rmdir to release cgroup_mutex. The rmdir, deactivating the cpu controller's files, waits in kernfs_drain() for the write's active reference. The write, in scx_group_set_weight(), waits for the rwsem behind the pending writer. Take cgroup_lock() first. The set_* paths take no cgroup locks inside the read side, so a pending write-lock then only waits for read sections that always run to completion, and no dependency from the rwsem back to cgroup_mutex remains.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a5bd6ba30b3364354269b81ac55c2edca9a96d6d a054c9ffa9b7a0dffb763837b91ac9d381ec6d10 git Not specified
CNA Linux Linux affected a5bd6ba30b3364354269b81ac55c2edca9a96d6d 5f8b69642d18e1f3e11996707842ac530444e959 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5f8b69642d18e1f3e11996707842ac530444e959 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a054c9ffa9b7a0dffb763837b91ac9d381ec6d10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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