{"id":"CVE-2026-64535","revision":"fb9ac0e721134dab961e34467dd94c5d","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":[]}