samples/damon/mtier: handle damon_stop() failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90006
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:13 UTC
Updated2026-09-16 11:17:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: samples/damon/mtier: handle damon_stop() failure damon_sample_mtier_stop() assumes its damon_stop() call will always successfully stops the two DAMON contexts. Hence it deallocates the two DAMON contexts after the damon_stop() call. However, if a given context is already stopped, damon_stop() fails and returns an error while letting the DAMON contexts that have not yet stopped keep running. This kind of unexpected early DAMON context stops could happen due to memory allocation failures in kdamond_fn(). Because damon_sample_mtier_stop() just deallocates all DAMON contexts with damon_target and damon_region objects that are linked to the contexts, the execution of the unstopped DAMON context (kdamond) ends up using the memory that freed (use-after-free). Fix the issue by separating the damon_stop() to be invoked per context. Note that DAMON_SYSFS also allows multiple DAMON contexts execution. But, it calls damon_stop() for each context one by one. Hence this issue is only in mtier. For the long term, it would be better to refactor damon_stop() to always ensure stopping all contexts regardless of the failures in the middle. Make this fix in the current way, though, to keep it simple and easy to backport. I will do the refactoring later. The issue was discovered [1] by Sashiko.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 82a08bde3cf7bbbe90de57baa181bebf676582c7 3c07c57b894116ae26f01b84c68e68b538ada7ed git Not specified
CNA Linux Linux affected 82a08bde3cf7bbbe90de57baa181bebf676582c7 215f9a7e4f1dcfc05ebcdc5c1ad0ea0dcb47bd09 git Not specified
CNA Linux Linux affected 82a08bde3cf7bbbe90de57baa181bebf676582c7 9dc5b6d66fd51b103eff21ed0df3e292f489ebc0 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/215f9a7e4f1dcfc05ebcdc5c1ad0ea0dcb47bd09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9dc5b6d66fd51b103eff21ed0df3e292f489ebc0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c07c57b894116ae26f01b84c68e68b538ada7ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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