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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.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-06 | Updated 2026-05-08 | Assigner Linux




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

e1e551bc56302b80ff930c966f9985095fb1b70d (git) before b66920a3348c0f63ba18365248fa21fbf0b3a937
affected

e1e551bc56302b80ff930c966f9985095fb1b70d (git) before 438b1f668ad58f46ce699bb48e4698a7839e3f9e
affected

e1e551bc56302b80ff930c966f9985095fb1b70d (git) before 3733fce2871c9bca9dd18a1a23b1432ea215a094
affected

e1e551bc56302b80ff930c966f9985095fb1b70d (git) before 33a3149dd81a1e2f52b80ee1e0fc380b39f3d028
affected

e1e551bc56302b80ff930c966f9985095fb1b70d (git) before 069daad4f2ae9c5c108131995529d5f02392c446
affected

Default status
affected

4.9
affected

Any version before 4.9
unaffected

6.6.136 (semver)
unaffected

6.12.83 (semver)
unaffected

6.18.24 (semver)
unaffected

6.19.14 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/b66920a3348c0f63ba18365248fa21fbf0b3a937

git.kernel.org/...c/438b1f668ad58f46ce699bb48e4698a7839e3f9e

git.kernel.org/...c/3733fce2871c9bca9dd18a1a23b1432ea215a094

git.kernel.org/...c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028

git.kernel.org/...c/069daad4f2ae9c5c108131995529d5f02392c446

cve.org (CVE-2026-43091)

nvd.nist.gov (CVE-2026-43091)

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