{"schema":"threatline.record/2","record":{"id":"CVE-2026-97611","aliases":[],"summary":"net: openvswitch: fix use-after-free of the flow table mask array","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: fix use-after-free of the flow table mask array\n\ntbl_mask_array_realloc() retires the old mask_array before it stops being\nreachable:\n\n\told = ovsl_dereference(tbl->mask_array);\n\tif (old) {\n\t\t...\n\t\tcall_rcu(&old->rcu, mask_array_rcu_cb);\n\t}\n\n\trcu_assign_pointer(tbl->mask_array, new);\n\ncall_rcu() only waits for read-side critical sections already in flight.\ntbl->mask_array still points at old between the call_rcu() and the\nrcu_assign_pointer(), so a reader entering ovs_flow_tbl_lookup_stats() in\nthat window picks up old in a fresh critical section that the pending\ngrace period does not cover.\n\ntbl_mask_array_realloc() runs in process context under ovs_mutex, so the\nwindow is preemptible and can outlast the grace period. Then\nmask_array_rcu_cb() frees old before the swap runs:\n\n  BUG: KASAN: slab-use-after-free in flow_lookup.constprop.0+0x2bf/0x2f0\n  Read of size 8 at addr ffff888020b3e018 by task poc/741\n   flow_lookup.constprop.0+0x2bf/0x2f0\n   ovs_flow_tbl_lookup_stats+0x4a3/0x5c0\n   ovs_dp_process_packet+0x19c/0x710\n   ovs_vport_receive+0x243/0x390\n   internal_dev_xmit+0x81/0x170\n  Freed by task 728:\n   kfree+0x16a/0x4e0\n   rcu_core+0x853/0x1030\n\nPublish the new array before retiring the old one. The kfree_rcu() that\ncall_rcu() replaced ran after the swap.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"4c98b492e9ed63f9ca3e23566d9a6a4f235944f4","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"4016ead17acd75312c066ecd47c4b7f0a81ceaa2","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"017dbbf0d6c319a487f68e22f56d91fc787d5525","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"76678217cdabc41e3c74c23b45b62086ffb8fe7a","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"cd982e11684def5d4a9fcfd5354de09032828414","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"a0d18d21d48a551f82ee344e50efb8a682161489","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"035e9c3722067648a99010711d0ce81f42572ef4","status":"affected","versionType":"git"},{"version":"eac87c413bf9794c14d488998a5265ea5b32f04e","lessThan":"ba4ba11ed6eb8972c69070417fc27b48deb002e8","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.9","status":"affected"},{"version":"0","lessThan":"5.9","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4c98b492e9ed63f9ca3e23566d9a6a4f235944f4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4016ead17acd75312c066ecd47c4b7f0a81ceaa2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"017dbbf0d6c319a487f68e22f56d91fc787d5525","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"76678217cdabc41e3c74c23b45b62086ffb8fe7a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","source_modified_at":"2026-10-19T09:10:15.022Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"035e9c3722067648a99010711d0ce81f42572ef4","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00159,"percentile":0.04718,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:20.827Z","modified_at":"2026-10-19T09:10:15.022Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97611","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:10:15.022Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97611","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4c98b492e9ed63f9ca3e23566d9a6a4f235944f4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4016ead17acd75312c066ecd47c4b7f0a81ceaa2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/017dbbf0d6c319a487f68e22f56d91fc787d5525"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/76678217cdabc41e3c74c23b45b62086ffb8fe7a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cd982e11684def5d4a9fcfd5354de09032828414"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a0d18d21d48a551f82ee344e50efb8a682161489"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/035e9c3722067648a99010711d0ce81f42572ef4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ba4ba11ed6eb8972c69070417fc27b48deb002e8"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:10:15.022Z","content_hash":"6ac5f25c1bbb81e83858f3e74497356397626e534d7ab98e4ed4a1d72d7ec522"}}