CVE-2026-90006
UnknownSummary
In the Linux kernel, samples/damon/mtier function damon_sample_mtier_stop() assumes damon_stop() always succeeds and deallocates DAMON contexts after the call. If a context is already stopped, damon_stop() fails, leaving running contexts, leading to use-after-free. The issue is only in mtier.
Risk Assessment
It can lead to a kernel use-after-free, potentially causing system crash or privilege escalation, though it requires specific conditions (memory allocation failure).
Recommendation
Update the Linux kernel to a version with the fix that calls damon_stop() separately for each context.
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Original NVD description (English source)
In 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS