{"id":"CVE-2026-80914","title":"Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready","summary":"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,…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 2387cd06a2c0b416f05028b02bba1089f54c28d9","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 49fd7116f76b860b230843700fb7423ab5331e1f","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 03288b7447c9e572f8ab82fc29cfb4ca719ab210","Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 560bef609fa5992745929e8d7d458b9d88dd2830","Linux 6.0"],"published":"2026-09-09","updated":"2026-09-14","sourceUpdated":"2026-09-14T11:58:54.701Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80914","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"}],"tags":["cve.org"],"epss":0.00232,"epssPercentile":0.14346,"ingestedAt":"2026-09-14T15:23:07.456Z","slug":"CVE-2026-80914","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 2387cd06a2c0b416f05028b02bba1089f54c28d9`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 49fd7116f76b860b230843700fb7423ab5331e1f`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 03288b7447c9e572f8ab82fc29cfb4ca719ab210`\n- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 560bef609fa5992745929e8d7d458b9d88dd2830`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":36983,"id":"CVE-2026-80914","ts":1789022125851,"field":"cvss","old":null,"new":"8.8"},{"seq":36982,"id":"CVE-2026-80914","ts":1789022125851,"field":"severity","old":"none","new":"high"}]}