CVE-2026-74637— Linux Perf 核心组件 组领导者 分离后释放后使用漏洞
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。
以下是该漏洞描述信息的中文翻译： 在 Linux 内核中，以下漏洞已得到修复： perf/core: 修复 sibling（组内成员事件）分离后的组头（leader）使用-after-free 问题 对组头（leader）和组内成员（sibling）的分离处理方式是不同的。当组头被分离时，所有组内成员都被提升为独立事件（singleton events），并且它们的 指针会被重置指向自身。而当某个组内成员被分离时，它虽然会从组头的 中移除，但其 指针仍然指向原来的组头。 如果组内成员随后被立即关闭并释放（例如在 路
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 8a49542c0554af7d0073aac0ee73ee65b807ef34< b42948f9e0d1ea4dbd5742ce1dfc7688de5d4a35 |
affected |
8a49542c0554af7d0073aac0ee73ee65b807ef34< a979a642402d0b1f856c7a729b4cb2d92de4cf2f |
affected | ||
8a49542c0554af7d0073aac0ee73ee65b807ef34< 1e7abfeb23c12bf46f6457e4a3e1a1a300d50619 |
affected | ||
8a49542c0554af7d0073aac0ee73ee65b807ef34< 42c5ca1f0a288a52878bd72a5595b08261057438 |
affected | ||
e732ebc42aea321ee84514330eb3a675307fcc83 |
affected | ||
2.6.34.14< 2.6.35 |
affected | ||
2.6.35 |
affected | ||
< 2.6.35 |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-74637 基础信息
漏洞信息
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Vulnerability Title
perf/core: Fix group leader use-after-free after sibling detach
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
perf/core: Fix group leader use-after-free after sibling detach
perf_group_detach() handles leader and sibling detach differently. When the
group leader is detached, all siblings are promoted to singleton events and
their group_leader pointer is reset to themselves. When a sibling is
detached, it is removed from the leader's sibling_list, but its
group_leader pointer is left pointing at the old leader.
That is harmless when the sibling is being closed and freed immediately, as
in the DETACH_DEAD path. It is not safe when the sibling is detached but
kept alive, such as during CPU hotplug with DETACH_GROUP. In that case the
sibling is removed from the context, while its file descriptor can still
keep it alive.
A typical failing sequence is:
- A group contains leader L and sibling S.
- CPU hot-unplug detaches S with DETACH_GROUP, removing it from
L->sibling_list but leaving S->group_leader == L.
- L is later closed and freed.
- A PERF_IOC_FLAG_GROUP ioctl on S follows S->group_leader and
dereferences the freed leader.
This was reproduced by running the perf event fuzzer, CPU hotplug, and a
stress workload concurrently:
Unable to handle kernel paging request at virtual address 006b6b6b6b6b6cdb
CPU: 2 PID: 12489 Comm: perf_fuzzer 6.18.7 PREEMPT
pc : perf_ioctl+0x34c/0xc68
x20: ffffff89a3fa2c70 x8 : 6b6b6b6b6b6b6b6b
Code: 943c4a0e 340047a0 f9404a94 f9411e88 (f940b908)
Call trace:
perf_ioctl+0x34c/0xc68 (P)
__arm64_sys_ioctl+0xa0/0xf4
invoke_syscall+0x58/0xe4
el0_svc_common+0xa8/0xdc
do_el0_svc+0x1c/0x28
el0_svc+0x40/0xc0
el0t_64_sync_handler+0x68/0xdc
el0t_64_sync+0x1c4/0x1c8
The fault happened in perf_ioctl(), where perf_event_for_each() follows
the stale group_leader pointer and perf_event_for_each_child() then
dereferences the freed leader's context.
Fix the use-after-free by promoting the detached sibling to a singleton.
Also fix __event_disable() cgroup accounting and event state change.
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-2026-74637 的公开POC
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CVE-2026-74637 补丁与修复 (4)
同批安全公告 · Linux · 2026-08-22 · 共 150 条
| CVE-2026-74640 | ALSA FCP fcp_meter_ctl_get 缓冲区越界写漏洞 | |
| CVE-2026-74621 | Linux内核 act_ct 模块 sk_buff 泄漏漏洞 | |
| CVE-2026-74622 | Atlantic 网卡 RX 页面释放漏洞 | |
| CVE-2026-74623 | Atlantic网卡驱动TX缓冲区释放漏洞 | |
| CVE-2026-74624 | netfilter: nf_conntrack 解锁前延迟记录无效 | |
| CVE-2026-74625 | netfilter 网桥非IP路径模板连接跟踪释放漏洞 | |
| CVE-2026-74627 | net: devmem 防止 net-io v/页面混合漏洞 | |
| CVE-2026-74626 | NTB：ntb_netdev 分配失败时保留 RX 队列深度 | |
| CVE-2026-74628 | Linux内核 x25 远程计时器释放后使用漏洞 | |
| CVE-2026-74629 | net/dibs: 修复 dmb_clientid_arr 释放漏洞 | |
| CVE-2026-74631 | Linux SMC splice条目生命周期不平衡漏洞 | |
| CVE-2026-74630 | IPv6中in6_dev_get()防止复活inet6_dev漏洞 | |
| CVE-2026-74632 | Linux内核 huge_memory 竞态条件漏洞 | |
| CVE-2026-74633 | tracing: 修复模块事件缓存移除中的空指针解引用漏洞 | |
| CVE-2026-74634 | ring-buffer：禁用调整大小时防止子缓冲区间顺序变化 | |
| CVE-2026-74635 | fbdev bitblit bit_cursor() glyph索引越界漏洞 | |
| CVE-2026-74636 | tracing 工具更新字段与事件定义字段竞态条件漏洞 | |
| CVE-2026-74639 | ALSA us144mkii 重新锚定捕获 URB 漏洞 | |
| CVE-2026-74638 | drm/v3d 调度器超时处理串行化漏洞 | |
| CVE-2026-74651 | rtl8723bs: 修复rtw_get_wpa_ie()中的越界读取漏洞 |
显示前 20 条，共 150 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74637
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