CVE-2026-53357

Enriched by CISA
 

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del() bt_accept_dequeue() unlinks a not-yet-accepted child from the parent accept queue and release_sock()s it before returning, so the returned sk has no caller reference and is unlocked. l2cap_sock_cleanup_listen() walks these children on listening-socket close. A concurrent HCI disconnect drives hci_rx_work -> l2cap_conn_del() which runs l2cap_chan_del() + l2cap_sock_kill() and frees the child sk and its l2cap_chan; cleanup_listen() then uses both: BUG: KASAN: slab-use-after-free in l2cap_sock_kill l2cap_sock_kill / l2cap_sock_cleanup_listen / __x64_sys_close Freed by: l2cap_conn_del -> l2cap_sock_close_cb -> l2cap_sock_kill This is distinct from the two fixes already in this area: commit e83f5e24da741 ("Bluetooth: serialize accept_q access") serialises the accept_q list/poll and takes temporary refs inside bt_accept_dequeue(), and CVE-2025-39860 serialises the userspace close()/accept() race by calling cleanup_listen() under lock_sock() in l2cap_sock_release(). Neither covers l2cap_conn_del() running from hci_rx_work, so this UAF still reproduces on current bluetooth/master. Take the reference at the source: bt_accept_dequeue() does sock_hold() while sk is still locked, before release_sock(); callers sock_put(). cleanup_listen() pins the chan with l2cap_chan_hold_unless_zero() under a brief child sk lock (serialising vs l2cap_sock_teardown_cb()), drops it before l2cap_chan_lock(), and skips a duplicate l2cap_sock_kill() on SOCK_DEAD. conn->lock is not taken here: cleanup_listen() runs under the parent sk lock and that would invert conn->lock -> chan->lock -> sk_lock (lockdep). KASAN/SMP: an unprivileged listen/close vs HCI-disconnect race produced 12 use-after-free reports per run before this change; 0, and no lockdep report, over 1600+ raced iterations after it on bluetooth/master.
https://nvd.nist.gov/vuln/detail/CVE-2026-53357

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 15f02b91056253e8cdc592888f431da0731337b8 < 751de6ec671fe75ad9cf65a0638d2a06b6a5984d [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < 407217734835d21d4e0105ebf347860dc1806f88 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < 7eebd4c2c86f573af87ff165d08a83432eb0b919 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < 87c543e2f78d0871f271df92dab98901bbd5b6f5 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < added1213395071470a900cc845a042fb51882a6 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < a5ca86a6097a8b030ca3226cd300b17ed330f966 [affected]
  • 15f02b91056253e8cdc592888f431da0731337b8 < ab1513597c6cf17cd1ad2a21e3b045421b48e022 [affected]
Linux Linux
  • 5.7 [affected]
  • < 5.7 [unaffected]
  • 5.10.259 ≤ 5.10.* [unaffected]
  • 5.15.210 ≤ 5.15.* [unaffected]
  • 6.1.175 ≤ 6.1.* [unaffected]
  • 6.6.142 ≤ 6.6.* [unaffected]
  • 6.12.92 ≤ 6.12.* [unaffected]
  • 6.18.34 ≤ 6.18.* [unaffected]
  • 7.0.11 ≤ 7.0.* [unaffected]
  • 7.1 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 5.10.259
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 5.15.210
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 6.1.175
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 6.6.142
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 6.12.92
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 6.18.34
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 7.0.11
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.7 < 7.1

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry