{"id":"CVE-2026-74536","state":"PUBLISHED","title":"Bluetooth: ISO: fix leaking sk after socket release","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix leaking sk after socket release\n\niso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||\nsock_flag(sk, SOCK_DEAD) for early return, but this is always true since\nsock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket\nalways leaks, iso_sock_destruct is never called.\n\nThe socket reference also leaks when __iso_sock_close() does not set\nSOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after\nzapping.\n\nFix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for\nsomething else, and lock_sock to ensure iso_sock_kill() puts sk only\nafter socket release only once. Release and iso_conn_del may run\nconcurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up\nafter zapping.\n\nRemove call to iso_sock_kill() from iso_sock_close(), as it's generally\nno-op there.","publishedAt":"2026-08-15T12:27:49.054Z","updatedAt":"2026-08-17T05:21:20.361Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"96ed3c772c08e7a91c399567f412618e43231023","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e76a0ae6542ae43241b2147bacf4990e7ae5316a","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e30e5ca63c8fbe3cd505fbb419bb547760cda633","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"ce57442a379212fe3fda59c9437ee8217eceb5b1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"references":["https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023","https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a","https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633","https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74536.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74536","state":"PUBLISHED","datePublished":"2026-08-15T12:27:49.054Z","dateUpdated":"2026-08-17T05:21:20.361Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.913Z"},"containers":{"cna":{"title":"Bluetooth: ISO: fix leaking sk after socket release","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix leaking sk after socket release\n\niso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||\nsock_flag(sk, SOCK_DEAD) for early return, but this is always true since\nsock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket\nalways leaks, iso_sock_destruct is never called.\n\nThe socket reference also leaks when __iso_sock_close() does not set\nSOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after\nzapping.\n\nFix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for\nsomething else, and lock_sock to ensure iso_sock_kill() puts sk only\nafter socket release only once. Release and iso_conn_del may run\nconcurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up\nafter zapping.\n\nRemove call to iso_sock_kill() from iso_sock_close(), as it's generally\nno-op there."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"96ed3c772c08e7a91c399567f412618e43231023","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e76a0ae6542ae43241b2147bacf4990e7ae5316a","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"e30e5ca63c8fbe3cd505fbb419bb547760cda633","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","status":"affected","lessThan":"ce57442a379212fe3fda59c9437ee8217eceb5b1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023"},{"url":"https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a"},{"url":"https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633"},{"url":"https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:21:20.361Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}