CVE-2026-72123— 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基金会开源的一个操作系统内核。 Linux kernel 5.19版本存在安全漏洞，该漏洞源于can:bcm模块对thrtimer处理不当，在RX操作拆除期间并发RCU读取器可重新启动thrtimer，导致释放后重用，可能造成内核崩溃或拒绝服务。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 26
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 85cd41070df992d3c0dfd828866fdd243d3b774a< de5fce46637de05bef56ec08528127676eb6fc9b |
affected |
f34f2a18e47b73e48f90a757e1f4aaa8c7d665a1< 036a8c320ca11bc912e8027adcfad14b326f067e |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< 3cf4fd5316f449811d8baf1bc6978ef5a7b743a9 |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< 4177762f70646ac48a2af382e45a795cbd295198 |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< 6fd08e8d826c3aa4cc7021f5f9cdbb7fa7441d3f |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< cd830e0bc25ee2d38cbfbdbb3cd77c5f53b2b6d5 |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< ce2d4b121fb7545e1ed588e860c8e5fd5ad45224 |
affected | ||
f1b4e32aca0811aa011c76e5d6cf2fa19224b386< 68973f9db76144825e4f35dfdc80fb8279eb2d57 |
affected | ||
| … +18 条更多 | |||
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一、 漏洞 CVE-2026-72123 基础信息
漏洞信息
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Vulnerability Title
can: bcm: defer rx_op deallocation to workqueue to fix thrtimer UAF
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: defer rx_op deallocation to workqueue to fix thrtimer UAF
Commit f1b4e32aca08 ("can: bcm: use call_rcu() instead of costly
synchronize_rcu()") replaced synchronize_rcu() in bcm_delete_rx_op()
with call_rcu() and introduced the RX_NO_AUTOTIMER flag.
However, this flag check was omitted for thrtimer in the packet rx
fast-path. During BCM RX operation teardown, a concurrent RCU reader
(bcm_rx_handler) can race and re-arm thrtimer via
bcm_rx_update_and_send() after call_rcu() has been scheduled. Once
the RCU grace period elapses, bcm_op is freed. The subsequently
firing thrtimer then dereferences the deallocated op, causing a UAF.
Adding flag checks to the rx fast-path (bcm_rx_update_and_send) does not
fully close the TOCTOU race and introduces latency for every CAN frame.
Conversely, calling hrtimer_cancel() directly inside the RCU callback
(softirq context) is fatal as hrtimer_cancel() can sleep, triggering
a "scheduling while atomic" panic.
Resolve this by deferring the timer cancellation and memory free to a
dedicated unbound workqueue (bcm_wq). The RCU callback now queues a
work item to bcm_wq, which safely cancels both timers and deallocates
memory in sleepable process context. A dedicated workqueue is used to
prevent system-wide WQ saturation and is cleanly flushed/destroyed
on module unload to avoid rmmod page faults.
Since the deferred work can now outlive the calling context by an
unbounded amount, also take a reference on op->sk when it is assigned
and drop it only once the deferred work has cancelled both timers, so a
socket can no longer be freed out from under a still-armed timer whose
callback (bcm_send_to_user()) dereferences op->sk.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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基金会开源的一个操作系统内核。 Linux kernel 5.19版本存在安全漏洞，该漏洞源于can:bcm模块对thrtimer处理不当，在RX操作拆除期间并发RCU读取器可重新启动thrtimer，导致释放后重用，可能造成内核崩溃或拒绝服务。
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-2026-72123 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72123 补丁与修复 (7)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72381 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72393 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74401 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74406 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72355 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72339 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72211 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72194 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72351 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72366 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72098 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72083 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-72123
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