CVE-2026-43091xfrm: Wait for RCU readers during policy netns exit
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e1e551bc56302b80ff930c966f9985095fb1b70d before b66920a3348c0f63ba18365248fa21fbf0b3a937; from e1e551bc56302b80ff930c966f9985095fb1b70d before 438b1f668ad58f46ce699bb48e4698a7839e3f9e; from e1e551bc56302b80ff930c966f9985095fb1b70d before 3733fce2871c9bca9dd18a1a23b1432ea215a094; from e1e551bc56302b80ff930c966f9985095fb1b70d before 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028; from e1e551bc56302b80ff930c966f9985095fb1b70d before 069daad4f2ae9c5c108131995529d5f02392c446 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.9 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 7.0; 7.0; 7.0; 7.0; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937patch
- https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9epatch
- https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094patch
- https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028patch
- https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.