{"api_version":"1","generated_at":"2026-08-17T11:25:34+00:00","cve":"CVE-2026-74536","urls":{"html":"https://cve.report/CVE-2026-74536","api":"https://cve.report/api/cve/CVE-2026-74536.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74536","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74536"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:58","updated_at":"2026-08-17 06:19:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023","name":"https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633","name":"https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1","name":"https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a","name":"https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74536","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74536","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 96ed3c772c08e7a91c399567f412618e43231023 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a e76a0ae6542ae43241b2147bacf4990e7ae5316a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a e30e5ca63c8fbe3cd505fbb419bb547760cda633 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a ce57442a379212fe3fda59c9437ee8217eceb5b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74536","cve":"CVE-2026-74536","epss":"0.001680000","percentile":"0.064900000","score_date":"2026-08-16","updated_at":"2026-08-17 00:01:04"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"96ed3c772c08e7a91c399567f412618e43231023","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"e76a0ae6542ae43241b2147bacf4990e7ae5316a","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"e30e5ca63c8fbe3cd505fbb419bb547760cda633","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"ce57442a379212fe3fda59c9437ee8217eceb5b1","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:21:20.361Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"Bluetooth: ISO: fix leaking sk after socket release","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74536","datePublished":"2026-08-15T12:27:49.054Z","dateReserved":"2026-08-15T05:44:03.913Z","dateUpdated":"2026-08-17T05:21:20.361Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:58","lastModifiedDate":"2026-08-17 06:19:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74536","Ordinal":"1","Title":"Bluetooth: ISO: fix leaking sk after socket release","CVE":"CVE-2026-74536","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74536","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Bluetooth: ISO: fix leaking sk after socket release"}]}}}