CVE-2026-74628— Linux内核 x25 远程计时器释放后使用漏洞
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。
在 Linux 内核中，已修复以下漏洞： 网络层 x25：修复由定时器引起的 socket 释放后使用（use-after-free）漏洞 x25 的定时器通过 启用，并通过 取消。因此，待处理的定时器并不持有对 socket 的引用，且取消操作不会等待已在其他 CPU 上运行的回调函数结束。 还会无条件地重新启用定时器，这导致在 已通过其取消点后， 仍可能被重新安装。此时，后续的 会在定时器仍处于排队状态时释放 socket 内存，而下次定时器触发时将访问已释放的内存。KASAN 报告称在由 释放的 slab 对
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6b79659590f0f82a9b8efd2ffd55ec6399ebfc33 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< fdd9ac50b9b61ef2b2d52c5156aff788be91454d |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1fc9f6d2c7c9fdb341bfe8ca449c990632299ea6 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3c4919be5d910db4beebca420953858606fba7d8 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4bc522b33438fefc3272840ae5988771863a4f1f |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e92c7e2b41d1528a830bc64c5e4e46dfa8133dda |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2195424c3da2ef1829a63b807e3a900a90e57d85 |
affected | ||
2.6.12 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-74628 基础信息
漏洞信息
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Vulnerability Title
net/x25: fix use-after-free of the socket by its timers
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/x25: fix use-after-free of the socket by its timers
The x25 timers are armed with mod_timer() and cancelled with
timer_delete(), so a pending timer holds no reference on the socket and a
cancel does not wait for a callback already running on another CPU.
x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall
sk->sk_timer after __x25_destroy_socket() has passed its cancel point.
The following __sock_put() frees the socket while the timer is still
queued, and the next expiry uses freed memory. KASAN reports a
slab-use-after-free on the kmalloc-2k object freed by close().
timer_delete_sync() cannot be used here: x25_heartbeat_expiry() and
x25_timer_expiry() both reach the cancels from inside the timer they
would wait on, through __x25_destroy_socket() and x25_disconnect().
Arm the timers with sk_reset_timer() and cancel them with sk_stop_timer()
so that an armed timer owns a reference, and release it in both expiry
handlers. Rearm the heartbeat only while sk_hashed(sk) is still true,
since __x25_destroy_socket() unlinks the socket before dropping it. Arm
the deferred destroy timer the same way and drop its reference in
x25_destroy_timer().
Reproduced on net with KASAN, with the heartbeat period shortened so the
window recurs. With this patch the reproducer no longer triggers a
report and /proc/net/x25 drains.
Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
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-2026-74628 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74628 补丁与修复 (7)
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-2026-74629 | 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-2026-74637 | Linux Perf 核心组件 组领导者 分离后释放后使用漏洞 | |
| 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-2026-74628
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