{"id":"CVE-2026-53357","revision":"33ffff6ca8074125837bcd7e61a0b8a4","records":[{"revision":"33ffff6ca8074125837bcd7e61a0b8a4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53357","aliases":[],"title":"Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()\n\nbt_accept_dequeue() unlinks a not-yet-accepted child from the parent\naccept queue and release_sock()s it before returning, so the returned\nsk has no caller reference and is unlocked.\n\nl2cap_sock_cleanup_listen() walks these children on listening-socket\nclose. A concurrent HCI disconnect drives hci_rx_work ->\nl2cap_conn_del() which runs l2cap_chan_del() + l2cap_sock_kill() and\nfrees the child sk and its l2cap_chan; cleanup_listen() then uses both:\n\n BUG: KASAN: slab-use-after-free in l2cap_sock_kill\n l2cap_sock_kill / l2cap_sock_cleanup_listen / __x64_sys_close\n Freed by: l2cap_conn_del -> l2cap_sock_close_cb -> l2cap_sock_kill\n\nThis is distinct from the two fixes already in this area: commit\ne83f5e24da741 (\"Bluetooth: serialize accept_q access\") serialises the\naccept_q list/poll and takes temporary refs inside bt_accept_dequeue(),\nand CVE-2025-39860 serialises the userspace close()/accept() race by\ncalling cleanup_listen() under lock_sock() in l2cap_sock_release().\nNeither covers l2cap_conn_del() running from hci_rx_work, so this UAF\nstill reproduces on current bluetooth/master.\n\nTake the reference at the source: bt_accept_dequeue() does sock_hold()\nwhile sk is still locked, before release_sock(); callers sock_put().\ncleanup_listen() pins the chan with l2cap_chan_hold_unless_zero() under\na brief child sk lock (serialising vs l2cap_sock_teardown_cb()), drops\nit before l2cap_chan_lock(), and skips a duplicate l2cap_sock_kill() on\nSOCK_DEAD. conn->lock is not taken here: cleanup_listen() runs under\nthe parent sk lock and that would invert\nconn->lock -> chan->lock -> sk_lock (lockdep).\n\nKASAN/SMP: an unprivileged listen/close vs HCI-disconnect race produced\n12 use-after-free reports per run before this change; 0, and no lockdep\nreport, over 1600+ raced iterations after it on bluetooth/master.","state":0,"publishedAt":"2026-07-02T13:43:17.077+00:00","modifiedAt":"2026-10-19T20:07:44.061+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/af_bluetooth.c\",\n \"net/bluetooth/iso.c\",\n \"net/bluetooth/l2cap_sock.c\",\n \"net/bluetooth/rfcomm/sock.c\",\n \"net/bluetooth/sco.c\"\n ],\n \"versions\": [\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"751de6ec671fe75ad9cf65a0638d2a06b6a5984d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"407217734835d21d4e0105ebf347860dc1806f88\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"7eebd4c2c86f573af87ff165d08a83432eb0b919\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"5d86d2f1b4d9a508c441d3e45277ae1a73cfed57\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"87c543e2f78d0871f271df92dab98901bbd5b6f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"added1213395071470a900cc845a042fb51882a6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"a5ca86a6097a8b030ca3226cd300b17ed330f966\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"15f02b91056253e8cdc592888f431da0731337b8\",\n \"lessThan\": \"ab1513597c6cf17cd1ad2a21e3b045421b48e022\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bluetooth/af_bluetooth.c\",\n \"net/bluetooth/iso.c\",\n \"net/bluetooth/l2cap_sock.c\",\n \"net/bluetooth/rfcomm/sock.c\",\n \"net/bluetooth/sco.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.142\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.92\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.34\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.11\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/751de6ec671fe75ad9cf65a0638d2a06b6a5984d","https://git.kernel.org/stable/c/407217734835d21d4e0105ebf347860dc1806f88","https://git.kernel.org/stable/c/7eebd4c2c86f573af87ff165d08a83432eb0b919","https://git.kernel.org/stable/c/5d86d2f1b4d9a508c441d3e45277ae1a73cfed57","https://git.kernel.org/stable/c/87c543e2f78d0871f271df92dab98901bbd5b6f5","https://git.kernel.org/stable/c/added1213395071470a900cc845a042fb51882a6","https://git.kernel.org/stable/c/a5ca86a6097a8b030ca3226cd300b17ed330f966","https://git.kernel.org/stable/c/ab1513597c6cf17cd1ad2a21e3b045421b48e022"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53357","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53357","identifiers":["CVE-2026-53357"]},"retained":false,"historicalAffected":[]}],"coverage":[]}