CVE-2026-80775— 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futex_hash_allocate()在分配mm->futex.phash.ref时未加锁，存在竞争条件，可能导致释放后使用，从而使任务在futex_q_lock()中写入已释放内存。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d9b05321e21e4b218de4ce8a590bf375f58b6346< 86d12b34bafc9a4c271a9edefea88855a934d6e5 |
affected |
d9b05321e21e4b218de4ce8a590bf375f58b6346< ff252ed45c8263525f2f54d81c5fa6d547fba344 |
affected | ||
d9b05321e21e4b218de4ce8a590bf375f58b6346< c4b4972d8edcdf50b6518f55119e129d2f668a10 |
affected | ||
d9b05321e21e4b218de4ce8a590bf375f58b6346< bde0238083647381d4747355c5a19115a3422b96 |
affected | ||
6.17 |
affected | ||
< 6.17 |
unaffected | ||
6.18.47≤ 6.18.* |
unaffected | ||
7.1.11≤ 7.1.* |
unaffected | ||
| … +2 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-80775 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
futex: Fix race on the initial mm->futex.phash.ref allocation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix race on the initial mm->futex.phash.ref allocation
futex_hash_allocate() allocates mm->futex.phash.ref without any locking.
Commit d9b05321e21e ("futex: Move futex_hash_free() back to __mmput()")
moved the allocation here and assumed that the process has just a single
thread at this point.
Commit ee9dce44362b ("futex: Drop CLONE_THREAD requirement for private
default hash alloc") widened need_futex_hash_allocate_default() to cover
any CLONE_VM clone, but left out vfork because the parent is suspended and
cannot race.
That no longer holds once vfork is nested. If a vfork child calls vfork
again and is then killed with SIGKILL, the parent is released from its
vfork wait and runs concurrently with the grandchild in the same mm.
Neither of them went through futex_hash_allocate_default().
When both call prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS) at the same
time, each one sees mm->futex.phash.ref as NULL and stores its own percpu
counter. Only the last store survives. The counter stored first is no
longer reachable from the mm, so the references on it are not seen by
__futex_ref_atomic_end(). A private hash that still has references is then
considered dead and freed, and a task that still holds one of its buckets
writes into freed memory in futex_q_lock().
Store the counter once with cmpxchg() and let the loser free_percpu() its
own. The initial reference has to be taken before the store, otherwise
another task can install a private hash while the counter is still 0.
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futex_hash_allocate()在分配mm->futex.phash.ref时未加锁，存在竞争条件，可能导致释放后使用，从而使任务在futex_q_lock()中写入已释放内存。
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-2026-80775 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-80775 的情报信息
请登录查看更多情报信息。
CVE-2026-80775 补丁与修复 (4)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80775
暂无评论