EUVD-2026-24797
GHSA-rhx5-38hr-wvr9
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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6DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/sysfs: check contexts->nr before accessing contexts_arr[0]
Multiple sysfs command paths dereference contexts_arr[0] without first verifying that kdamond->contexts->nr == 1. A user can set nr_contexts to 0 via sysfs while DAMON is running, causing NULL pointer dereferences.
In more detail, the issue can be triggered by privileged users like below.
First, start DAMON and make contexts directory empty (kdamond->contexts->nr == 0).
damo start
cd /sys/kernel/mm/damon/admin/kdamonds/0
echo 0 > contexts/nr_contexts
Then, each of below commands will cause the NULL pointer dereference.
echo update_schemes_stats > state
echo update_schemes_tried_regions > state
echo update_schemes_tried_bytes > state
echo update_schemes_effective_quotas > state
echo update_tuned_intervals > state
Guard all commands (except OFF) at the entry point of damon_sysfs_handle_cmd().
AnalysisAI
Denial of service via null pointer dereference in Linux kernel DAMON sysfs module allows local privileged users to crash the system by setting nr_contexts to zero while DAMON is running, then issuing state-change commands that dereference an empty contexts array without bounds checking. EPSS exploitation probability is minimal at 0.02%, reflecting the requirement for local privileged access and active DAMON configuration.
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