cgroup/cpuset: Don't access cpuset_cgrp_subsys.root in is_in_v2_mode()

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Summary

CVECVE-2026-98972
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:18 UTC
Updated2026-10-23 13:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: Don't access cpuset_cgrp_subsys.root in is_in_v2_mode() After seeing the patch [1] to guard is_in_v2_mode() with RCU, it makes me realize that is_in_v2_mode() may be called in a context where a new cgroup filesystem is being rebound with stale cpuset_cgrp_subsys.root pointer. Avoid this potential UaF situation by adding a new cpuset_v2_mode flag which is set when the cpuset_v2_mode mount option is used. This flag is written into only when cpuset_bind() is being called with a stable cpuset_cgrp_subsys.root value. The is_in_v2_mode() helper is modified to read the new cpuset_v2_mode flag instead of accessing cpuset_cgrp_subsys.root directly. [1] https://lore.kernel.org/lkml/[email protected]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b8d1b8ee93df8ffbabbeadd65d39853cfad6d698 988bf67a13890a37a33201f95947095ca9bec856 git Not specified
CNA Linux Linux affected b8d1b8ee93df8ffbabbeadd65d39853cfad6d698 e06b678e3b4e12fdaa0b51a7a5a54abc5dbd6469 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/988bf67a13890a37a33201f95947095ca9bec856 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e06b678e3b4e12fdaa0b51a7a5a54abc5dbd6469 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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