Bug 2460637 (CVE-2026-31459)

Summary: CVE-2026-31459 kernel: mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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OS: Linux   
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Description OSIDB Bzimport 2026-04-22 15:02:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm/damon/sysfs: fix param_ctx leak on damon_sysfs_new_test_ctx() failure

Patch series "mm/damon/sysfs: fix memory leak and NULL dereference
issues", v4.

DAMON_SYSFS can leak memory under allocation failure, and do NULL pointer
dereference when a privileged user make wrong sequences of control.  Fix
those.


This patch (of 3):

When damon_sysfs_new_test_ctx() fails in damon_sysfs_commit_input(),
param_ctx is leaked because the early return skips the cleanup at the out
label.  Destroy param_ctx before returning.
Comment 1 Keith Grant 2026-04-22 17:46:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042250-CVE-2026-31459-0600@gregkh/T