xfrm: Wait for RCU readers during policy netns exit_CVE-2026-43091

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Wait for RCU readers during policy netns exit\n\nxfrm_policy_fini() frees the policy_bydst hash tables after flushing the\npolicy work items and deleting all policies, but it does not wait for\nconcurrent RCU readers to leave their read-side critical sections first.\n\nThe policy_bydst tables are published via rcu_assign_pointer() and are\nlooked up through rcu_dereference_check(), so netns teardown must also\nwait for an RCU grace period before freeing the table memory.\n\nFix this by adding synchronize_rcu() before freeing the policy hash tables.",
    "published": "2026-05-06T07:40:23.955Z",
    "modified": "2026-05-08T12:40:29.086Z",
    "type": "cve",
    "title": "xfrm: Wait for RCU readers during policy netns exit",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937\nhttps://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e\nhttps://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094\nhttps://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028\nhttps://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446",
    "id": "CVE-2026-43091",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux e1e551bc56302b80ff930c966f9985095fb1b70d\nLinux Linux e1e551bc56302b80ff930c966f9985095fb1b70d\nLinux Linux e1e551bc56302b80ff930c966f9985095fb1b70d\nLinux Linux e1e551bc56302b80ff930c966f9985095fb1b70d\nLinux Linux e1e551bc56302b80ff930c966f9985095fb1b70d\nLinux Linux 4.9",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
    "vendor": "Linux",
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    "ai_score": 0
}