Vulnerability details
CVE-2026-43091
Linux Linux
xfrm: Wait for RCU readers during policy netns exit
CVSS 3.1
7.8High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.9 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < b66920a3348c0f63ba18365248fa21fbf0b3a937 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < 438b1f668ad58f46ce699bb48e4698a7839e3f9e | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < b2faee12538b5b008eaef65a4201eb29cb5cefb3 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < 069daad4f2ae9c5c108131995529d5f02392c446 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | e1e551bc56302b80ff930c966f9985095fb1b70d ≤ v < 3733fce2871c9bca9dd18a1a23b1432ea215a094 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://git.kernel.org/stable/c/b2faee12538b5b008eaef65a4201eb29cb5cefb3
- https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937
- https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e
- https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094
- https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028
- https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446
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Details
- Published
- 2026-05-06
- Last updated
- 2026-10-30
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.13%
Probability of exploitation in 30 days
2.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free