CVE-2026-90005
UnknownSummary
In the Linux kernel, the samples/damon/wsse sample module's damon_sample_wsse_start() function did not free the DAMON context memory when damon_start() failed. This leads to a memory leak, and more broadly, similar mishandling of damon_start() and damon_stop() failures across DAMON sample modules can cause memory leaks, disruptions of subsequent DAMON operations, and use-after-free.
Risk Assessment
Repeated invocations can cause gradual kernel memory leaks and system instability. Exploitation requires administrator (sudo) privileges, limiting the risk to privileged users.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-90005. If the DAMON sample modules are not used, consider not loading them or restricting access to them.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: samples/damon/wsse: handle damon_start() failure Patch series "samples/damon: handle damon_{start,stop}() failures". All DAMON sample modules are not correctly handling failures from damon_start(). Among those, mtier also has an additional problem for handling of damon_stop() failures. wsse and prcl also have a problem in their damon_call() failure handling. As a result, memory leaks, next DAMON operation disruptions, and use-after-free can happen. Fix those. Note that only the damon_start() failure caused issues can reliably be reproduced. Reproducing those issues require the admin permission, though. This patch (of 6): damon_sample_wsse_start() callers assume it will clean up resources when it fails. And the function does the cleanup for context buildup failures. However, it is not doing the cleanup for damon_start() failure. As a result, when damon_start() fails, it leaks the memory for DAMON context. Free the context in case of the failure to fix the issues. Note that the issue can reliably be reproduced because the module calls damon_start() in the exclusive mode. For example, $ sudo damo start $ echo $$ | sudo tee /sys/module/damon_sample_wsse/parameters/target_pid $ echo Y | sudo tee /sys/module/damon_sample_wsse/parameters/enabled $ sudo cat /proc/allocinfo | grep damon_new_ctx Because the first command is running another DAMON instance, the third command fails the damon_start() call because the new DAMON instance cannot exclusively run. And without this fix, by repeating the third and the fourth commands above, we can show the memory consumption is only increasing due to the leaks. It requires the sudo permission though. The issue was discovered [1] by Sashiko.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS