CVE-2026-72166— 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存在安全漏洞，该漏洞源于p9_client_rpc函数在处理P9_TFLUSH请求时对致命信号处理不当，清除TIF_SIGPENDING标志导致无限循环，可能导致拒绝服务。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 91b8534fa8f5e01f249b1bf8df0a2540053549ad< 18a3427526e2141f80050f82c1d26b19a454707d |
affected |
91b8534fa8f5e01f249b1bf8df0a2540053549ad< 378481cc60a937ef8ea4ef6e4f95f0dbc4e21414 |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< 4f621ae3a2d99b0bac50e8d66cbf7f68323c01e8 |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< f62a1f245a71680033260a6f6d74011cc3acb3cd |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< dc892cbb1e4341d427b1f940ebd6abd69bf8e479 |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< a8874c34c4a973f9922908a4b8be1d1278f01e42 |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< 823886a1b089b49bcd349bc8bd3417b7910cd1ac |
affected | ||
91b8534fa8f5e01f249b1bf8df0a2540053549ad< 6b4f48728faa8bb514368f7eacda05565dea8696 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-72166 基础信息
漏洞信息
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Vulnerability Title
net/9p: fix infinite loop in p9_client_rpc on fatal signal
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/9p: fix infinite loop in p9_client_rpc on fatal signal
When p9_client_rpc() is called with type P9_TFLUSH and the transport
has no peer (e.g. fd transport backed by pipes with no 9p server),
a fatal signal causes an infinite loop:
again:
err = io_wait_event_killable(req->wq, ...)
/* SIGKILL wakes the task, returns -ERESTARTSYS */
if (err == -ERESTARTSYS && c->status == Connected &&
type == P9_TFLUSH) {
sigpending = 1;
clear_thread_flag(TIF_SIGPENDING);
goto again;
}
clear_thread_flag() clears TIF_SIGPENDING before jumping back to
io_wait_event_killable(). signal_pending_state() checks TIF_SIGPENDING,
finds it zero, and the task goes to sleep again. The task can only wake
on the next signal delivery that calls signal_wake_up() and sets
TIF_SIGPENDING again. When that happens the loop repeats, clears
TIF_SIGPENDING, and sleeps again indefinitely.
This is triggered in practice by coredump_wait(): when a thread in a
multi-threaded process causes a coredump (e.g. via SIGSYS from Syscall
User Dispatch), coredump_wait() sends SIGKILL to all other threads and
waits for them to call mm_release(). If one of those threads is blocked
in p9_client_rpc() over an fd transport with no peer, it enters the
P9_TFLUSH loop and never calls mm_release(), so coredump_wait() stalls
forever:
INFO: task syz.0.18:676 blocked for more than 143 seconds.
Not tainted 6.12.77+ #1
task:syz.0.18 state:D stack:27600 pid:676 tgid:673 ppid:630 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5344 [inline]
__schedule+0xcb4/0x5d50 kernel/sched/core.c:6724
__schedule_loop kernel/sched/core.c:6801 [inline]
schedule+0xe5/0x350 kernel/sched/core.c:6816
schedule_timeout+0x253/0x290 kernel/time/timer.c:2593
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x409/0x600 kernel/sched/completion.c:116
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_state+0x1d/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:448 [inline]
do_coredump+0x854/0x4350 fs/coredump.c:629
get_signal+0x1425/0x2730 kernel/signal.c:2903
arch_do_signal_or_restart+0x81/0x880 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xf9/0x160 kernel/entry/common.c:218
do_syscall_64+0x102/0x220 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
Fix: check fatal_signal_pending() before clearing TIF_SIGPENDING in the
P9_TFLUSH retry loop. At that point TIF_SIGPENDING is still set, so
fatal_signal_pending() works correctly. If a fatal signal is pending,
jump to recalc_sigpending to restore TIF_SIGPENDING and return
-ERESTARTSYS to the caller.
The same defect is present in stable kernels back to 5.4. On those
kernels the infinite loop is broken earlier by a second SIGKILL from
the parent process (e.g. kill_and_wait() retrying after a timeout),
resulting in a zombie process and a shutdown delay rather than a
permanent D-state hang, but the underlying flaw is the same.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
来源: CVE Program / CVE List V5
CVSS Information
N/A
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存在安全漏洞，该漏洞源于p9_client_rpc函数在处理P9_TFLUSH请求时对致命信号处理不当，清除TIF_SIGPENDING标志导致无限循环，可能导致拒绝服务。
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-2026-72166 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72166 补丁与修复 (8)
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-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72201 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72065 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72064 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74480 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72191 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72192 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72194 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74269 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72209 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72211 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72210 | 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-2026-72166
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