{"id":"CVE-2026-46300","revision":null,"records":[{"revision":"8ef438eadd9045c2bd08702c6cd7f4ae","observedAt":"2026-10-29T04:47:47.759+00:00","statement":{"source":"cve-program","id":"CVE-2026-46300","aliases":[],"title":"net: skbuff: preserve shared-frag marker during coalescing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to. If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers. In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data(). If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags. The tailroom copy path does not need the marker because it copies\nbytes into @to's linear data rather than transferring frag descriptors.","state":0,"publishedAt":"2026-05-23T11:44:02.231+00:00","modifiedAt":"2026-10-29T03:55:37.33+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/core/skbuff.c\"\n ],\n \"versions\": [\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"3599e6b3cc1ada96883d496a50a210d3afbb6987\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"9d3e5fd19fe1063bf607219e8562fbd567b8e8d5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"78bf6b6bb19541d19fbda6242e7cfe2c682763c0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"3bd9e113d50034db99d7ef69fd8e5242d15e414a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"3884358a9286b17f389a72b1426fc4547c23c111\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"cef401de7be8c4e155c6746bfccf721a4fa5fab9\",\n \"lessThan\": \"f84eca5817390257cef78013d0112481c503b4a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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/core/skbuff.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.9\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.9\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.257\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.208\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.174\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.141\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.91\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.33\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.10\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3599e6b3cc1ada96883d496a50a210d3afbb6987","https://git.kernel.org/stable/c/2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c","https://git.kernel.org/stable/c/9d3e5fd19fe1063bf607219e8562fbd567b8e8d5","https://git.kernel.org/stable/c/78bf6b6bb19541d19fbda6242e7cfe2c682763c0","https://git.kernel.org/stable/c/760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e","https://git.kernel.org/stable/c/3bd9e113d50034db99d7ef69fd8e5242d15e414a","https://git.kernel.org/stable/c/3884358a9286b17f389a72b1426fc4547c23c111","https://git.kernel.org/stable/c/f84eca5817390257cef78013d0112481c503b4a3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46300","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46300","identifiers":["CVE-2026-46300"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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