CVE-2026-98385— Linux内核sched/cache模块UAF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。
在 Linux 内核中，已修复以下漏洞： sched/cache：将 sched_cache_group 与 mm 解耦，以修复 Use-After-Free（UAF）漏洞 目前，调度缓存（sched cache）按进程描述符（mm）进行分组，调度统计信息 存储在 结构中。这使得调度统计信息的生命周期与 的生命周期紧密绑定。 在 函数中，调度统计信息通过 进行访问。然而，当一个 CPU 上的任务正在切换其 结构时，另一个 CPU 可能正在执行 ，并可能访问已被释放的旧 。Hyunwoo 在使用 KASAN（内核地址
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation
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一、 漏洞 CVE-2026-98385 基础信息
漏洞信息
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Vulnerability Title
sched/cache: Decouple sched_cache_group from mm to fix UAF
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sched/cache: Decouple sched_cache_group from mm to fix UAF
Currently the sched cache grouping is by mm and the scheduling statistics
sched_cache_stat lives in the mm structure. This ties the life cycle
of scheduling stats with mm.
In account_mm_sched(), the scheduling stats are accessed by
task->mm->sc_stat. However, a task may be switching mm on one CPU when
another CPU is running account_mm_sched(), and possibly accessing the
old mm that was freed. This problem was found when running tests with
KASAN by Hyunwoo:
https://lore.kernel.org/lkml/apPb-Dr4nPYuHQOK@v4bel/
Instead of serializing the mm access by introducing extra acquisition of
rq lock in the mm free path, extract sched_cache_stat from mm_struct,
rename it as sched_cache_group and manage its life cycle apart from
mm_struct with its own ref counting. This allows us in the next patch
access sched_cache_group directly from task, and add a refcount
on sched_cache_group when a task links to it. This prevents the use
after free issue when accessing stale and released old mm and its
sched cache stat a task switches to a new mm while account_mm_sched()
is done elsewhere.
The other benefit of this restructure is in the future, the grouping of
tasks to a LLC would have the flexibility to be associated with a user
defined grouping, or cgroup, cookie group, numa_group or others instead
of just with a single mm address space.
Rename sched_cache_stat to sched_cache_group and turn it into a refcounted
object allocated from mm_struct. The mm_struct now holds a pointer
(sched_cache_grp) to this object instead of embedding it.
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
受影响产品
二、漏洞 CVE-2026-98385 的公开POC
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CVE-2026-98385 其他参考 (2)
IV. Related Vulnerabilities
V. Comments for CVE-2026-98385
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