{"schema":"threatline.record/2","record":{"id":"CVE-2026-99213","aliases":[],"summary":"vsock: treat TCP_CLOSING as once-established","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: treat TCP_CLOSING as once-established\n\nHandle the TCP_ESTABLISHED -> TCP_CLOSING transition on OP_RST, which can\nrace with the connect loop. Immediately break and return 0 on\nESTABLISHED/CLOSING. The return value of connect() should reflect what\nhappened up to the point the connection was established or failed. Events\nthat occur afterwards must not affect it. E.g. even if OP_RW has already\nset sk_err, connect() should still return 0, not ENOBUFS because of it.\nAdapt the inaccurate comment above signal_pending().\n\nResetting a socket that is still present in connected_table can lead to\nmemory corruption. The reporter noted lost transports for in-flight skbs,\nand I have reproduced crashes caused by re-insertion into connected_table.\n\n  list_add double add: new=, prev=, next=.\n  kernel BUG at lib/list_debug.c:35!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  Workqueue: vsock-loopback vsock_loopback_work\n  RIP: 0010:__list_add_valid_or_report+0x11f/0x130\n  Call Trace:\n   vsock_insert_connected.cold+0xe/0x13\n   virtio_transport_recv_pkt+0x10e9/0x1460\n   vsock_loopback_work+0x305/0x480\n   process_one_work+0xe4c/0x1560\n   worker_thread+0x4f1/0xd60\n   kthread+0x36e/0x470\n   ret_from_fork+0x47b/0x6b0\n   ret_from_fork_asm+0x1a/0x30\n\nThis fix is supplementary to commit 002541ef650b (\"vsock: Ignore\nsignal/timeout on connect() if already established\"). Details under Link.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99213","source_modified_at":"2026-10-28T10:36:06.441Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"c2c5359ef2c33684fa3f3652fd761a483db8d1e7","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"44d1ca05d6094a5d75c671a0545249186d790b8d","status":"affected","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","lessThan":"4f6ac74fa594a918d41255c941256e1d51592d3b","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99213","source_modified_at":"2026-10-28T10:36:06.441Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"3.9","status":"affected"},{"version":"0","lessThan":"3.9","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","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-2026-99213","source_modified_at":"2026-10-28T10:36:06.441Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"44d1ca05d6094a5d75c671a0545249186d790b8d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99213","source_modified_at":"2026-10-28T10:36:06.441Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"4f6ac74fa594a918d41255c941256e1d51592d3b","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:36:06.441Z","modified_at":"2026-10-28T10:36:06.441Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99213","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:36:06.441Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/c2c5359ef2c33684fa3f3652fd761a483db8d1e7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/44d1ca05d6094a5d75c671a0545249186d790b8d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4f6ac74fa594a918d41255c941256e1d51592d3b"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T10:36:06.441Z","content_hash":"beb61e2ef7b552a9a30384b23e54f3124cd33171a371b94914360834a8c6c8aa"}}