CVE-2026-74639— ALSA us144mkii 重新锚定捕获 URB 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： ALSA: us144mkii：在重新提交（resubmission）时重新锚定捕获 URB 在重新提交每个捕获 URB 时未进行锚定操作： 锚定（anchoring）是提交操作的一个属性，而非 URB 本身的属性。在“给出”（giveback）路径中，会在调用 之前调用 ，因此从 URB 自身完成处理函数重新提交的 URB 将不再处于锚定状态。捕获 URB 仅在流启动时锚定一次，因此从第一次完成之后， 即为空。 、 、 以及停止工作路径（stop-work path）均会
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 5
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 16f14f55141d4c55c3f321f93c328fff7cd6860a< 7779249561d14b8a17c0c83783225794e24a587d |
affected |
ab1db64912428cdf06a4f9542e16e0575e9ad59f< a5548ce916594c811bd90ce33d67baa3557a6791 |
affected | ||
5cff1529a2f9b3461a7f5a6e36a86682fc290534< 2615f0fb90df8cf5a96133ca4be74294ed288604 |
affected | ||
6.18.39< 6.18.45 |
affected | ||
7.1.4< 7.1.9 |
affected |
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一、 漏洞 CVE-2026-74639 基础信息
漏洞信息
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Vulnerability Title
ALSA: us144mkii: re-anchor capture URBs on resubmission
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: us144mkii: re-anchor capture URBs on resubmission
capture_urb_complete() resubmits each capture URB without anchoring it:
usb_get_urb(urb);
ret = usb_submit_urb(urb, GFP_ATOMIC);
Anchoring is a property of a submission, not of the URB. The giveback
path calls usb_unanchor_urb() before urb->complete(), so an URB
resubmitted from its own completion handler is off the anchor. The
capture URBs are anchored once, at stream start, so from the first
completion onward tascam->capture_anchor is empty.
tascam_free_urbs(), tascam_disconnect(), tascam_suspend() and the
stop-work path all call usb_kill_anchored_urbs(&tascam->capture_anchor)
to reap the capture URBs before anything is freed. With the anchor empty
those calls return immediately and the URBs stay queued on the host
controller.
tascam_free_urbs() then returns the capture transfer buffers with
usb_free_coherent(), and snd_card_free() releases the snd_card
allocation that embeds tascam (card->private_data). The controller
completes the queued URBs afterwards, writing device-supplied data into
the freed transfer buffer, and capture_urb_complete() dereferences the
freed driver object.
KASAN on 7.2.0-rc5 (arm64):
BUG: KASAN: slab-use-after-free in dummy_timer
Write of size 512 at addr ffff000015b62000
__asan_memcpy
dummy_timer
hrtimer_run_softirq
Allocated by task 64:
usb_alloc_coherent
tascam_alloc_urbs
tascam_probe
Freed by task 170:
usb_free_coherent
tascam_free_urbs
tascam_disconnect
usb_unbind_interface
BUG: KASAN: slab-use-after-free in capture_urb_complete
Read of size 4 at addr ffff0000170ee878
Freed by task 170:
release_card_device
snd_card_free
tascam_disconnect
Restore the usb_anchor_urb() between the reference count bump and the
resubmission. That also makes the handler's usb_unanchor_urb() failure
arm meaningful again and restores usb_kill_anchored_urbs() as a barrier
on the disconnect, suspend and stop-work paths.
The anchoring was removed on the premise that the URB is already anchored
from the initial submission, which does not hold once the first giveback
has run.
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-2026-74639 的公开POC
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|---|
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CVE-2026-74639 补丁与修复 (3)
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-2026-74637 | Linux Perf 核心组件 组领导者 分离后释放后使用漏洞 | |
| 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-2026-74639
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