{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80914","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.801Z","datePublished":"2026-09-09T16:10:58.675Z","dateUpdated":"2026-09-14T11:58:54.701Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-14T11:58:54.701Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\n\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\nwhich takes a reference, and then, without re-checking its state,\ncreates a child socket from it:\n\n    parent = iso_get_sock(hdev, ...);\n    if (!parent)\n        return;\n\n    lock_sock(parent);\n    sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\n    ...\n    iso_chan_add(conn, sk, parent);\n    ...\n    release_sock(parent);\n    sock_put(parent);\n\nIf the listener socket is closed concurrently, between iso_get_sock()\nand lock_sock(), the reference taken by iso_get_sock() may be the last\none: the close path drops the link-list reference, and once\niso_conn_ready() drops its own reference at the end of the function the\nsocket is freed.  The child socket, however, is already linked to the\nfreed parent, and a later disconnect of the child runs iso_chan_del()\n-> bt_accept_unlink(), which dereferences the dangling parent pointer\ninto the freed accept queue (a use-after-free).  The same dangling\npointer is also dereferenced through parent->***() in\niso_chan_del().\n\nFix it the same way the connected (non-BIS) path was fixed in commit\n0d255e63fcf3 (\"Bluetooth: ISO: hold sk properly in iso_conn_ready\"):\nafter taking the socket lock, re-check that the parent is still a\nlistening, alive socket, and bail out otherwise."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - The UAF is in Bluetooth ISO iso_conn_ready() parent-lookup for incoming CIS/BIS/PA; that path runs from HCI connect_cfm events (hci_le_cis_req_evt, BIG/PA sync) driven by LE isochronous traffic from peers in radio range, which is an adjacent attack surface.\nAC:L - This is a use-after-free race between iso_get_sock() and listener close (iso_sock_release/iso_sock_kill) before lock_sock(); an attacker who opens/closes an ISO listen socket while concurrent HCI CIS/BIS/PA completion runs controls both sides and can trigger it without uncontrollable conditions.\nPR:N - iso_sock_create has no capability check, and the vulnerable path is reached from unauthenticated HCI CIS/BIG/PA events processed for any Bluetooth-enabled device in range; listener close can occur from automatic LE Audio/bluetoothd teardown without privileged local credentials.\nUI:N - No victim action is required: iso_connect_ind returns HCI_LM_ACCEPT so incoming CIS/BIS/PA sync is auto-accepted when an ISO listener exists, and OS LE Audio stacks keep such listeners during normal broadcast/unicast operation.\nS:U - The UAF corrupts kernel socket/accept-queue memory and can enable privilege escalation within the host kernel; it does not cross a VM, container, or IOMMU security boundary, so scope remains unchanged.\nC:H - Use-after-free of the listener struct sock (and later bt_accept_unlink of the dangling parent) lets an attacker reuse the freed sock/accept-queue object, enabling arbitrary kernel memory disclosure via heap grooming per UAF guidance.\nI:H - The child is linked to the freed parent via iso_chan_add/bt_accept_enqueue; later iso_chan_del -> bt_accept_unlink writes the freed parent's accept queue (list_del, sk_acceptq_removed), a kernel heap write primitive usable for control-flow hijack.\nA:H - Dereferencing the freed listener in iso_chan_del/bt_accept_unlink (accept_q_lock, list, parent->sk_data_ready) causes kernel oops/panic; UAFs in this ISO path are a high availability impact even before full exploitation."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"],"versions":[{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8","status":"affected","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de","status":"affected","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"2387cd06a2c0b416f05028b02bba1089f54c28d9","status":"affected","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"49fd7116f76b860b230843700fb7423ab5331e1f","status":"affected","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"03288b7447c9e572f8ab82fc29cfb4ca719ab210","status":"affected","versionType":"git"},{"version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","lessThan":"560bef609fa5992745929e8d7d458b9d88dd2830","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/iso.c"],"versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.1.188","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.157","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.109","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.50","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.4","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.3-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8"},{"url":"https://git.kernel.org/stable/c/d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de"},{"url":"https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9"},{"url":"https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f"},{"url":"https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210"},{"url":"https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830"}],"title":"Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready","x_generator":{"engine":"bippy-1.2.0"}}}}