CVE-2026-89796

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

mm/damon/core: avoid infinite kdamond_merge_regions() internal loop

Patch series "mm/damon: unurgent fixes for infinite loop, NULL de-ref and

races", v1.1.

Sashiko found a few issues in DAMON that could cause infinite loop, NULL

dereference and monitoring results degradation. The first two sounds

scary but the infinite loop happens only under unreasonable user setup.

The NULL dereference is only in a unit test. Monitoring results

degradation is trivial since it is only best-effort, and those happens

from only unlikely races. Still those are bugs that better to fix if

possible. Fix those.

This patch (of 6):

Due to online parameter update like events, the number of DAMON regions

could be higher than the user-set upper limit. kdamond_merge_regions()

repeats merge regions until the number meets the limit, while doubling the

merge threshold up to the theoretical maximum threshold. It is tried only

up to the the

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References