SECUFOCUSNOW
Home›CVE index›CVE-2025-40215
Review reviewHigh

CVE-2025-40215

Linux

In the Linux kernel, the following vulnerability has been resolved: xfrm: delete x->tunnel as we delete x The ipcomp fallback tunnels currently get deleted (from the various lists and hashtables) as the last user state that needed that fallback is destroyed (not deleted). If a reference to that user state still exists, the fallback state will remain on the hashtables/lists, triggering the WARN in xfrm_state_fini. Because of those remaining references, the fix in commit f75a2804da39 ("xfrm: destroy xfrm_state synchronously on net exit path") is not complete. We recently fixed one such situat...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.12.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: xfrm: delete x->tunnel as we delete x The ipcomp fallback tunnels currently get deleted (from the various lists and hashtables) as the last user state that needed that fallback is destroyed (not deleted). If a reference to that user state still exists, the fallback state will remain on the hashtables/lists, triggering the WARN in xfrm_state_fini. Because of those remaining references, the fix in commit f75a2804da39 ("xfrm: destroy xfrm_state synchronously on net exit path") is not complete. We recently fixed one such situat...

Affected product and versions

Product
Linux
Affected versions
>= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 1b28a7fae0128fa140a7dccd995182ff6cd1c67b, >= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 4b2c17d0f9be8b58bb30468bc81a4b61c985b04e, >= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < 0da961fa46da1b37ef868d9b603bd202136f8f8e, >= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < d0e0d1097118461463b76562c7ebaabaa5b90b13, >= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < dc3636912d41770466543623cb76e7b88fdb42c7, >= 9d4139c76905833afcb77fe8ccc17f302a0eb9ab < b441cf3f8c4b8576639d20c8eb4aa32917602ecd, >= 2.6.29
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available