mm/damon/core: validate damos_quota_goal->nid for node_memcg_{used,free}_bp

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Summary

CVECVE-2026-46067
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:27 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/core: validate damos_quota_goal->nid for node_memcg_{used,free}_bp Users can set damos_quota_goal->nid with arbitrary value for node_memcg_{used,free}_bp. But DAMON core is using those for NODE-DATA() without a validation of the value. This can result in out of bounds memory access. The issue can actually triggered using DAMON user-space tool (damo), like below. $ sudo mkdir /sys/fs/cgroup/foo $ sudo ./damo start --damos_action stat --damos_quota_interval 1s \ --damos_quota_goal node_memcg_used_bp 50% -1 /foo $ sudo dmseg [...] [ 524.181426] Unable to handle kernel paging request at virtual address 0000000000002c00 Fix this issue by adding the validation of the given node id. If an invalid node id is given, it returns 0% for used memory ratio, and 100% for free memory ratio.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b74a120bcf50787e5b9a2c3dcff999f9836ce1db da10db73ada26345244ea5dc52f974692bd05f66 git Not specified
CNA Linux Linux affected b74a120bcf50787e5b9a2c3dcff999f9836ce1db a34dac6482e53e2c76944f25b1489b9b7da3a6e6 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a34dac6482e53e2c76944f25b1489b9b7da3a6e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/da10db73ada26345244ea5dc52f974692bd05f66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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