mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock

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Summary

CVECVE-2026-46183
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:33 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock damon_sysfs_quot_goal->path can be read and written by users, via DAMON sysfs 'path' file. It can also be indirectly read, for the parameters {on,off}line committing to DAMON. The reads for parameters committing are protected by damon_sysfs_lock to avoid the sysfs files being destroyed while any of the parameters are being read. But the user-driven direct reads and writes are not protected by any lock, while the write is deallocating the path-pointing buffer. As a result, the readers could read the already freed buffer (user-after-free). Note that the user-reads don't race when the same open file is used by the writer, due to kernfs's open file locking. Nonetheless, doing the reads and writes with separate open files would be common. Fix it by protecting both the user-direct reads and writes with damon_sysfs_lock.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.052520000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c41e253a411eb73a5ac651c14f40c2ea2f274ebd a34ca3e33da4b924c66bcca3729bf68ec5936910 git Not specified
CNA Linux Linux affected c41e253a411eb73a5ac651c14f40c2ea2f274ebd cf3b71421ca00807328c6d9cd242f9de3b77a4bf git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a34ca3e33da4b924c66bcca3729bf68ec5936910 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf3b71421ca00807328c6d9cd242f9de3b77a4bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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