{"id":"CVE-2026-74529","state":"PUBLISHED","title":"Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that.","publishedAt":"2026-08-15T12:27:44.783Z","updatedAt":"2026-10-21T12:45:47.259Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb8b860e87b296bd1874c79a668081efd00f9754","status":"affected","lessThan":"40ef39f1d755ff8d54423345c73d187e77854d0b","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"68ffe4265775ed9e09e18e9a3b388740e25257bf","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"c53c70ec289ee12f20c4f1b2fbfd151762c01f67","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"44fc74069d8988f2825246f9401218e29de2c0ab","versionType":"git"},{"version":"94bf6380e936339a700c0b3171a49baf512aa70b","status":"affected","versionType":"git"},{"version":"6.12.28","status":"affected","lessThan":"6.12.114","versionType":"semver"},{"version":"6.14.6","status":"affected","lessThan":"6.15","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","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/hci_sync.c"]}],"references":["https://git.kernel.org/stable/c/40ef39f1d755ff8d54423345c73d187e77854d0b","https://git.kernel.org/stable/c/68ffe4265775ed9e09e18e9a3b388740e25257bf","https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67","https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74529.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74529","state":"PUBLISHED","datePublished":"2026-08-15T12:27:44.783Z","dateUpdated":"2026-10-21T12:45:47.259Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.912Z"},"containers":{"cna":{"title":"Bluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_connect_pa_sync() callback\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb8b860e87b296bd1874c79a668081efd00f9754","status":"affected","lessThan":"40ef39f1d755ff8d54423345c73d187e77854d0b","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"68ffe4265775ed9e09e18e9a3b388740e25257bf","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"c53c70ec289ee12f20c4f1b2fbfd151762c01f67","versionType":"git"},{"version":"6d0417e4e1cf66fd917f06f0454958362714ef7d","status":"affected","lessThan":"44fc74069d8988f2825246f9401218e29de2c0ab","versionType":"git"},{"version":"94bf6380e936339a700c0b3171a49baf512aa70b","status":"affected","versionType":"git"},{"version":"6.12.28","status":"affected","lessThan":"6.12.114","versionType":"semver"},{"version":"6.14.6","status":"affected","lessThan":"6.15","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/hci_sync.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","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/hci_sync.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/40ef39f1d755ff8d54423345c73d187e77854d0b"},{"url":"https://git.kernel.org/stable/c/68ffe4265775ed9e09e18e9a3b388740e25257bf"},{"url":"https://git.kernel.org/stable/c/c53c70ec289ee12f20c4f1b2fbfd151762c01f67"},{"url":"https://git.kernel.org/stable/c/44fc74069d8988f2825246f9401218e29de2c0ab"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Reached only via local AF_BLUETOOTH BTPROTO_ISO SOCK_SEQPACKET listen() for LE broadcast PA sync (iso_listen_bis→hci_pa_create_sync→hci_connect_pa_sync); no over-the-air packet parsing triggers the bug and a remote Bluetooth peer alone cannot invoke it.\nAC:L - Use-after-free race is attacker-controlled: a local process can listen() to start hci_le_pa_create_sync and immediately close/unlink the socket to drop the PA_LINK hci_conn while cmd_sync_work is still running, retrying until the callback dereferences freed memory.\nPR:L - ISO sockets perform no capability checks in iso_sock_create/bt_sock_create (only init_net), so any unprivileged local user who can open AF_BLUETOOTH sockets on a BT_ISO-capable host can reach hci_connect_pa_sync without CAP_NET_ADMIN or root.\nUI:N - Exploitation requires no victim action; the attacker opens, binds, and listens on their own ISO socket and races teardown—typical on phones/headsets running LE Audio broadcast receivers with Bluetooth access granted to the attacking app/process.\nS:U - Impact stays within kernel memory via hci_conn UAF in create_pa_complete/hci_le_pa_create_sync; this is standard kernel memory corruption/privilege escalation, not a cross-boundary escape (VM, IOMMU, or sandbox).\nC:H - UAF of struct hci_conn lets an attacker influence freed slab contents and read adjacent kernel data through hci_conn_valid(), conn->flags, and conn->iso_qos dereferences during async PA sync work and error callbacks.\nI:H - Freed hci_conn is written via set_bit/clear_bit on conn->flags and error-path hci_connect_cfm()/hci_conn_add_unset in create_pa_complete; heap grooming of the reclaimed allocation enables arbitrary kernel writes and control-flow hijack.\nA:H - Dereferencing or deleting a freed hci_conn in hci_cmd_sync_work reliably causes kernel memory corruption, oops, or panic; UAFs in this subsystem have been observed to crash the host even when not fully exploited for privilege escalation."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:45:47.259Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.28","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74529","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:59:13.725492Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:53.194Z"}}]}}}