CVE-2026-72071— 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 6.4版本存在安全漏洞，该漏洞源于tracing/user_events中user_event_mm_dup()在fork()期间无锁遍历enabler列表，与user_event_enabler_destroy()存在竞争条件，可能导致释放后重用。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7235759084a4f8524a46bd2638885ff3b34ce279< 25acb6711da6fa0382744fa92bd6d42a22c1ae68 |
affected |
7235759084a4f8524a46bd2638885ff3b34ce279< 95400e7039cdfeb0b53652d521d766f1698cae95 |
affected | ||
7235759084a4f8524a46bd2638885ff3b34ce279< b33ac2d39953efb12f598c0dae242c5f644ea669 |
affected | ||
7235759084a4f8524a46bd2638885ff3b34ce279< 05b24f68f78ff3a1ef7f015f7327b35886b741f6 |
affected | ||
7235759084a4f8524a46bd2638885ff3b34ce279< 50fd6dd755c6e48a38af2fa4621167eea56829c2 |
affected | ||
6.4 |
affected | ||
< 6.4 |
unaffected | ||
6.6.148≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-72071 基础信息
漏洞信息
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Vulnerability Title
tracing/user_events: Fix use-after-free in user_event_mm_dup()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tracing/user_events: Fix use-after-free in user_event_mm_dup()
user_event_mm_dup() walks the parent mm's enabler list locklessly under
rcu_read_lock() during fork() (from copy_process()); it does not take
event_mutex:
rcu_read_lock();
list_for_each_entry_rcu(enabler, &old_mm->enablers, mm_enablers_link)
enabler->event = user_event_get(orig->event);
user_event_enabler_destroy() removes an enabler from that list with
list_del_rcu() and then, without waiting for a grace period, drops the
enabler's user_event reference with user_event_put() and frees the enabler
with kfree(). A reader that loaded the enabler before the list_del_rcu()
can still be walking it, which leads to two use-after-frees:
- kfree(enabler) frees the enabler while that reader dereferences
enabler->event.
- user_event_put() may drop the last reference to the user_event, which
is then freed (via delayed_destroy_user_event() on a work queue), while
the same reader does user_event_get(orig->event) on it.
Both are reachable by an unprivileged task that can open user_events_data:
one multithreaded process that registers an enabler and then concurrently
unregisters it and calls fork() triggers the race. KASAN reports a
slab-use-after-free in user_event_mm_dup() during clone(), with a
"refcount_t: addition on 0" warning when the user_event is freed.
The enabler use-after-free was found first; the user_event one was reported
by XIAO WU, and the earlier enabler-only fix did not address it.
Defer both the user_event_put() and the kfree(enabler) to a work item
queued with queue_rcu_work(), so they run only after an RCU grace period,
once all readers walking the enabler list have finished. The put must run
in process context because user_event_put() takes event_mutex on the last
reference, so a work queue is used rather than call_rcu(). The now-unlocked
put lets the locked argument of user_event_enabler_destroy() be removed;
all callers are updated.
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 6.4版本存在安全漏洞，该漏洞源于tracing/user_events中user_event_mm_dup()在fork()期间无锁遍历enabler列表，与user_event_enabler_destroy()存在竞争条件，可能导致释放后重用。
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-2026-72071 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72071 补丁与修复 (5)
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-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 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-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74545 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72322 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72429 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72129 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72130 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72436 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72319 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72317 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74427 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74433 | 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-2026-72071
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