Loop with Unreachable Exit Condition ('Infinite Loop') The advisory has been revoked - it doesn't affect any version of package kernel-headers (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-KERNELHEADERS-14196503
- published6 Dec 2025
- disclosed4 Dec 2025
Introduced: 4 Dec 2025
CVE-2025-40218 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/vaddr: do not repeat pte_offset_map_lock() until success
DAMON's virtual address space operation set implementation (vaddr) calls pte_offset_map_lock() inside the page table walk callback function. This is for reading and writing page table accessed bits. If pte_offset_map_lock() fails, it retries by returning the page table walk callback function with ACTION_AGAIN.
pte_offset_map_lock() can continuously fail if the target is a pmd migration entry, though. Hence it could cause an infinite page table walk if the migration cannot be done until the page table walk is finished. This indeed caused a soft lockup when CPU hotplugging and DAMON were running in parallel.
Avoid the infinite loop by simply not retrying the page table walk. DAMON is promising only a best-effort accuracy, so missing access to such pages is no problem.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2418803
- https://access.redhat.com/security/cve/CVE-2025-40218
- https://git.kernel.org/stable/c/0ccd91cf749536d41307a07e60ec14ab0dbf21f5
- https://git.kernel.org/stable/c/677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf
- https://git.kernel.org/stable/c/ac42320ec873bfe726141069cfdd90ee5bc4e885
- https://git.kernel.org/stable/c/b93af2cc8e036754c0d9970d9ddc47f43cc94b9f