{"id":"CVE-2025-21766","revision":null,"records":[{"revision":"2803d9f302b24b99a83ec6b7ce34f3bf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21766","aliases":[],"title":"ipv4: use RCU protection in __ip_rt_update_pmtu()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: use RCU protection in __ip_rt_update_pmtu()\n\n__ip_rt_update_pmtu() must use RCU protection to make\nsure the net structure it reads does not disappear.","state":0,"publishedAt":"2025-02-27T02:18:16.57+00:00","modifiedAt":"2026-10-15T21:51:52.707+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/route.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"ce3c6165fce0f06305c806696882a3ad4b90e33f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"ea07480b23225942208f1b754fea1e7ec486d37e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"4583748b65dee4d61bd50a2214715b4237bc152a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"a39f61d212d822b3062d7f70fa0588e50e55664e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2fbc6e89b2f1403189e624cabaf73e189c5e50c6\",\n \"lessThan\": \"139512191bd06f1b496117c76372b2ce372c9a41\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f415c264176e6095e9dee823e09c5bdd0ee0d337\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"98776a365da509ad923083ae54b38ee521c52742\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"860e2cc78c697c95bc749abb20047239fa1722ea\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2b1be6c925cdf4638811765a9160796291494b89\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4.14.200\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.148\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.68\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.8.12\",\n \"lessThan\": \"5.9\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ipv4/route.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.9\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.9\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.179\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.129\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.79\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.16\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13.4\",\n \"lessThanOrEqual\": \"6.13.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ce3c6165fce0f06305c806696882a3ad4b90e33f","https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e","https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4","https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a","https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e","https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21766","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21766","identifiers":["CVE-2025-21766"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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