CVE-2026-99271— ALSA line6 驱动缓冲区释放信息泄露漏洞
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，以下漏洞已得到修复： ALSA: line6：在释放捕获缓冲区时清除 prev_fbuf 在生成脉冲测试信号时，submit_audio_out_urb() 函数中报告了一起 KASAN slab-use-after-free（释放后使用）读漏洞： BUG: KASAN: slab-use-after-free in create_impulse_test_signal sound/usb/line6/playback.c:76 [inline] BUG: KASAN: slab-use-a
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一、 漏洞 CVE-2026-99271 基础信息
漏洞信息
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Vulnerability Title
ALSA: line6: Clear prev_fbuf on capture buffer release
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: line6: Clear prev_fbuf on capture buffer release
A KASAN slab-use-after-free read was reported in submit_audio_out_urb()
when generating an impulse test signal:
BUG: KASAN: slab-use-after-free in create_impulse_test_signal sound/usb/line6/playback.c:76 [inline]
BUG: KASAN: slab-use-after-free in submit_audio_out_urb+0x1848/0x1b20 sound/usb/line6/playback.c:249
Read of size 2 at addr ffff888008d74870 by task syz.2.3214/7785
Allocated by task 11:
kmem_cache_alloc_noprof+0x2f0/0x390 mm/slub.c:4144
line6_buffer_acquire+0x1a1/0x220 sound/usb/line6/pcm.c:158
line6_pcm_acquire+0xb6/0x230 sound/usb/line6/pcm.c:329
line6_startup_work+0x3c/0x50 sound/usb/line6/driver.c:728
Freed by task 7785:
kfree+0xf8/0x390 mm/slub.c:6566
line6_buffer_release sound/usb/line6/pcm.c:176 [inline]
line6_buffer_release+0xa5/0xf0 sound/usb/line6/pcm.c:170
__line6_pcm_release sound/usb/line6/pcm.c:305 [inline]
line6_pcm_release+0x5a/0x80 sound/usb/line6/pcm.c:313
snd_toneport_monitor_put+0x11b/0x190 sound/usb/line6/toneport.c:183
line6pcm->prev_fbuf points into the capture PCM stream buffer
(line6pcm->in.buffer), which is updated during audio_in_callback() to
feed rate synchronization, software monitoring, and impulse test signal
generation on playback side.
When all capture streams are closed, line6_buffer_release() frees
pstr->buffer with kfree(). However, it does not clear line6pcm->prev_fbuf.
If playback is subsequently started (e.g. via impulse test signal
volume control snd_line6_impulse_volume_put()), submit_audio_out_urb()
dereferences the stale pointer line6pcm->prev_fbuf under in.lock,
resulting in a slab-use-after-free read.
Clear prev_fbuf and prev_fsize in line6_buffer_release() when releasing
the capture stream buffer under in.lock, ensuring that no stale buffer
pointer can be accessed by submit_audio_out_urb().
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-2026-99271 的公开POC
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CVE-2026-99271 其他参考 (3)
同批安全公告 · Linux · 2026-11-07 · 共 12 条
| CVE-2026-99282 | Linux Kernel sch_teql 释放后使用漏洞 | |
| CVE-2026-99281 | Linux tun 模块权限提升漏洞 | |
| CVE-2026-99277 | ksmbd 会话通道连接引用处理缺陷 | |
| CVE-2026-99279 | ksmbd 会话回收逻辑漏洞 | |
| CVE-2026-99278 | ksmbd 会话连接限制漏洞 | |
| CVE-2026-99280 | ksmbd 会话 procfs 读取器资源竞争漏洞 | |
| CVE-2026-99276 | ksmbd 会话锁忙时连接清理延迟漏洞 | |
| CVE-2026-99275 | Samba SMB 客户端拒绝短会话响应漏洞 | |
| CVE-2026-99273 | ksmbd 流信息 UTF-16 终止符缓冲区溢出漏洞 | |
| CVE-2026-99274 | Samba SMB 客户端 fiemap 越界读取漏洞 | |
| CVE-2026-99272 | Samba SMB2 客户端数据区域验证漏洞 |