mm/damon/sysfs: check contexts->nr in repeat_call_fn

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Summary

CVECVE-2026-31457
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:41 UTC
Updated2026-04-22 14:16:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: check contexts->nr in repeat_call_fn damon_sysfs_repeat_call_fn() calls damon_sysfs_upd_tuned_intervals(), damon_sysfs_upd_schemes_stats(), and damon_sysfs_upd_schemes_effective_quotas() without checking contexts->nr. If nr_contexts is set to 0 via sysfs while DAMON is running, these functions dereference contexts_arr[0] and cause a NULL pointer dereference. Add the missing check. For example, the issue can be reproduced using DAMON sysfs interface and DAMON user-space tool (damo) [1] like below. $ sudo damo start --refresh_interval 1s $ echo 0 | sudo tee \ /sys/kernel/mm/damon/admin/kdamonds/0/contexts/nr_contexts

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d809a7c64ba8229286b333c0cba03b1cdfb50238 3527e9fdc38570cea0f6ddb7a2c9303d4044b217 git Not specified
CNA Linux Linux affected d809a7c64ba8229286b333c0cba03b1cdfb50238 652cd0641a763dd0e846b0d12814977fadb2b7d8 git Not specified
CNA Linux Linux affected d809a7c64ba8229286b333c0cba03b1cdfb50238 6557004a8b59c7701e695f02be03c7e20ed1cc15 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3527e9fdc38570cea0f6ddb7a2c9303d4044b217 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6557004a8b59c7701e695f02be03c7e20ed1cc15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/652cd0641a763dd0e846b0d12814977fadb2b7d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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