{"id":"CVE-2026-74750","revision":null,"records":[{"revision":"06c96f6833a84c3cadbe21a13b7263fa","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74750","aliases":[],"title":"ovpn: defer key slot crypto freeing to workqueue","description":"In the Linux kernel, the following vulnerability has been resolved:\n\novpn: defer key slot crypto freeing to workqueue\n\nKey slots are released through a kref and the existing release path\nfrees the AEAD transforms from an RCU callback. That is not safe for all\ncrypto implementations: crypto_free_aead can sleep, for example when an\nasync or hardware implementation has teardown work to complete.\n\nUse queue_rcu_work for key-slot release. This keeps the RCU grace period\nneeded by lockless key-slot readers, but runs the actual crypto teardown\nfrom workqueue context where sleeping is allowed. Once the rcu_work\ncallback runs, pre-existing RCU readers are gone, and the final kref put\nalready proves that no transform user remains, so the worker can release\nthe AEAD transforms and free the slot directly.\n\nThe previous patch drains ovpn_wq during module exit, so queued key-slot\nteardown work cannot outlive module text.","state":0,"publishedAt":"2026-08-26T14:36:58.355+00:00","modifiedAt":"2026-10-15T10:09:31.165+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/net/ovpn/crypto.c\",\n                        \"drivers/net/ovpn/crypto.h\",\n                        \"drivers/net/ovpn/crypto_aead.c\",\n                        \"drivers/net/ovpn/crypto_aead.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8534731dbf2d52a539b94defd06d2a8d3514aacb\",\n                            \"lessThan\": \"5cea365559449f2149ab724d33d406e3ec4c00c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8534731dbf2d52a539b94defd06d2a8d3514aacb\",\n                            \"lessThan\": \"0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8534731dbf2d52a539b94defd06d2a8d3514aacb\",\n                            \"lessThan\": \"2da3dfa1ddfe55a065f484750c83660e3bd4ac00\",\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                        \"drivers/net/ovpn/crypto.c\",\n                        \"drivers/net/ovpn/crypto.h\",\n                        \"drivers/net/ovpn/crypto_aead.c\",\n                        \"drivers/net/ovpn/crypto_aead.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.10\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/5cea365559449f2149ab724d33d406e3ec4c00c9","https://git.kernel.org/stable/c/0f77ed5ee91946ea63e29f2e0ff9dc9e722d8da3","https://git.kernel.org/stable/c/2da3dfa1ddfe55a065f484750c83660e3bd4ac00"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74750","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74750","identifiers":["CVE-2026-74750"]},"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-473bda92d9f145e4a59d46ab39e596a4","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T17:15:31.9295462+00:00","lastSuccessAt":"2026-11-09T17:15:31.925+00:00","error":"8 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T17:15:31.925+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13381,"expectedIdentifiers":13707,"failedIdentifiers":8},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T17:05:03.6461191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T17:05:03.6461191+00:00","lastSuccessAt":"2026-11-09T17:05:03.8539711+00:00","error":null,"lastVerifiedAt":"2026-11-09T17:05:03.8539712+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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