CVE-2026-43091xfrm: Wait for RCU readers during policy netns exit
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Wait for RCU readers during policy netns exit xfrm_policy_fini() frees the policy_bydst hash tables after flushing the policy work items and deleting all policies, but it does not wait for concurrent RCU readers to leave their read-side critical sections first. The policy_bydst tables are published via rcu_assign_pointer() and are looked up through rcu_dereference_check(), so netns teardown must also wait for an RCU grace period before freeing the table memory. Fix this by adding synchronize_rcu() before freeing the policy hash tables.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < b2faee12538b5b008eaef65a4201eb29cb5cefb3
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < b66920a3348c0f63ba18365248fa21fbf0b3a937
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < 438b1f668ad58f46ce699bb48e4698a7839e3f9e
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < 3733fce2871c9bca9dd18a1a23b1432ea215a094
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028
- affected e1e551bc56302b80ff930c966f9985095fb1b70d – < 069daad4f2ae9c5c108131995529d5f02392c446
- affected 4.9
- unaffected < 4.9
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.136 – ≤ 6.6.*
- unaffected 6.12.83 – ≤ 6.12.*
- unaffected 6.18.24 – ≤ 6.18.*
- unaffected 6.19.14 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/b2faee12538b5b008eaef65a4201eb29cb5cefb3 (opens in a new tab)
- https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937 (opens in a new tab)
- https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e (opens in a new tab)
- https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094 (opens in a new tab)
- https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028 (opens in a new tab)
- https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-27592 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43091)Record last updated .