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CVE-2026-53357: Linux, грешка в паметта

8.0

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се от съседна мрежа, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

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.

Засегнати продукти

  • Linux Linux: 15f02b91056253e8cdc592888f431da0731337b8 преди 751de6ec671fe75ad9cf65a0638d2a06b6a5984d; 15f02b91056253e8cdc592888f431da0731337b8 преди 407217734835d21d4e0105ebf347860dc1806f88; 15f02b91056253e8cdc592888f431da0731337b8 преди 7eebd4c2c86f573af87ff165d08a83432eb0b919; 15f02b91056253e8cdc592888f431da0731337b8 преди 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57; 15f02b91056253e8cdc592888f431da0731337b8 преди 87c543e2f78d0871f271df92dab98901bbd5b6f5; 15f02b91056253e8cdc592888f431da0731337b8 преди added1213395071470a900cc845a042fb51882a6; 15f02b91056253e8cdc592888f431da0731337b8 преди a5ca86a6097a8b030ca3226cd300b17ed330f966; 15f02b91056253e8cdc592888f431da0731337b8 преди ab1513597c6cf17cd1ad2a21e3b045421b48e022
  • Linux Linux: 5.7; преди 5.7; 5.10.259 до 5.10.*; 5.15.210 до 5.15.*; 6.1.175 до 6.1.*; 6.6.142 до 6.6.*; 6.12.92 до 6.12.*; 6.18.34 до 6.18.*; 7.0.11 до 7.0.*; от 7.1 нататък

Вид слабост

История

  • 2 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-53357: Linux, грешка в паметта | freedomonline.bg