{"id":"CVE-2026-64535","revision":null,"records":[{"revision":"fb9ac0e721134dab961e34467dd94c5d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64535","aliases":[],"title":"nvmet-tcp: Fix potential UAF when ddgst mismatch","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: Fix potential UAF when ddgst mismatch\n\nShivam Kumar found via vulnerability testing:\nWhen data digest is enabled on an NVMe/TCP connection and a digest\nmismatch occurs on a non-final H2C_DATA PDU during an R2T-based\ndata transfer, the digest error handler in nvmet_tcp_try_recv_ddgst()\ncalls nvmet_req_uninit() — which performs percpu_ref_put() on the\nsubmission queue — but does NOT mark the command as completed. It\ndoes not set cqe->status, does not modify rbytes_done, and does not\nclear any flag. When the subsequent fatal error triggers queue\nteardown, nvmet_tcp_uninit_data_in_cmds() iterates all commands,\nchecks nvmet_tcp_need_data_in() for each one, and finds that the\nalready-uninited command still appears to need data (because\nrbytes_done < transfer_len and cqe->status == 0). It therefore calls\nnvmet_req_uninit() a second time on the same command — a double\npercpu_ref_put against a single percpu_ref_get.","state":0,"publishedAt":"2026-07-27T06:32:34.859+00:00","modifiedAt":"2026-10-19T20:48:39.004+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 \"drivers/nvme/target/tcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"91edfca6f8b364d60cde3ddefaf7d03ddf35774b\",\n \"lessThan\": \"dfb902462bca478f050224ec7a7195aafa7643b1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"7e558308eba14c8136cb1e615f0c850f76d1fc0a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"96fe2513df590e74b04253a45089cae75569570e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"e091ff83d962f9ed00d9bd70443676de9fe98bdc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"6f9442983a3e4227afd1c83a5251ddbca585ea21\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"088ee46c18d99baef453afd74181dd40ade044ad\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"fda871c0ba5d2eed2cd1c881573168129da70058\",\n \"lessThan\": \"dbbd07d0a7020b80f6a7028e561908f7b83b3d5a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4b17476d809273617d3317fa0d4ae78aa488d760\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.20\",\n \"lessThan\": \"5.10.265\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.11.3\",\n \"lessThan\": \"5.12\",\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 \"drivers/nvme/target/tcp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.12\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.12\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/dfb902462bca478f050224ec7a7195aafa7643b1","https://git.kernel.org/stable/c/7e558308eba14c8136cb1e615f0c850f76d1fc0a","https://git.kernel.org/stable/c/96fe2513df590e74b04253a45089cae75569570e","https://git.kernel.org/stable/c/e091ff83d962f9ed00d9bd70443676de9fe98bdc","https://git.kernel.org/stable/c/6f9442983a3e4227afd1c83a5251ddbca585ea21","https://git.kernel.org/stable/c/088ee46c18d99baef453afd74181dd40ade044ad","https://git.kernel.org/stable/c/dbbd07d0a7020b80f6a7028e561908f7b83b3d5a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64535","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64535","identifiers":["CVE-2026-64535"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-3c4bbd4ca5ed46108ac75e394fa48ace","complete":true,"records":13654,"lastAttemptAt":"2026-11-08T16:11:35.9510843+00:00","lastSuccessAt":"2026-11-08T16:11:35.947+00:00","error":null,"lastVerifiedAt":"2026-11-08T16:11:35.947+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. 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