CVE-2026-53357— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于蓝牙协议栈中释放后重用问题，可能导致监听套接字关闭时与HCI断开并发导致的释放后重用攻击。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| 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 | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-53357 基础信息
漏洞信息
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Vulnerability Title
Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于蓝牙协议栈中释放后重用问题，可能导致监听套接字关闭时与HCI断开并发导致的释放后重用攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-53357 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-53357 补丁与修复 (7)
IV. Related Vulnerabilities
V. Comments for CVE-2026-53357
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