CVE-2025-40218: mm/damon/vaddr: do not repeat pte_offset_map_lock() until success

Deferred
AliasesUBUNTU-CVE-2025-40218DEBIAN-CVE-2025-40218
Published 04-12-2025Last modified 11-05-2026

Vulnerability summary

CVE-2025-40218 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.4% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 20
OPENSUSE-SU-2026:20145-1SUSE-SU-2026:20207-1SUSE-SU-2026:20220-1SUSE-SU-2026:20228-1SUSE-SU-2026:20564-1USN-8029-1

Timeline

  1. 04-12-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu127 products
  • linux< 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 7780d04046a2288ab85d88bedacc60fa4fad9971, < 677ebfe5d00f94adec0c0204f6e6e2a82d3f77bf | ≥ 7780d04046a2288ab85d88bedacc60fa4fad9971, < ac42320ec873bfe726141069cfdd90ee5bc4e885 | ≥ 7780d04046a2288ab85d88bedacc60fa4fad9971, < 0ccd91cf749536d41307a07e60ec14ab0dbf21f5 | ≥ 7780d04046a2288ab85d88bedacc60fa4fad9971, < b93af2cc8e036754c0d9970d9ddc47f43cc94b9f | 6.5

3 vendors · 129 products

References

23 links
Show all 23 references