CVE-2026-43091

high

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_b…

Vendor / product: Linux — linux kernel

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

7.8 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Timeline (UTC)

Published: 2026-05-06 10:16

Modified: 2026-10-30 13:18

NVD status: Modified

Last synced 1 day ago

Verified against the source API 2026-10-30 13:38 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linux / linux_kernel ≥4.9 <6.6.136, ≥6.7 <6.12.83, ≥6.13 <6.18.24, ≥6.19 <6.19.14, 7.0

Weakness classification (CWE)

NVD-CWE-noinfo CWE-416

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Patch / mitigation: https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446

Patch / mitigation: https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028

Patch / mitigation: https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094

Patch / mitigation: https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e

Patch / mitigation: https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937

References

https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b2faee12538b5b008eaef65a4201eb29cb5cefb3 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Data sources

NVD CVE API 2.0 — fetched 2026-10-30 13:38 UTC · record ↗

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CVE-2026-43091

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Weakness classification (CWE)

Mitigation & advisories

References

Data sources

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