Expired Pointer Dereference Affecting kernel package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL10-KERNEL-22283169
- published8 Nov 2026
- disclosed7 Nov 2026
Introduced: 7 Nov 2026
NewCVE-2026-99271 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
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().
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2568634
- https://access.redhat.com/security/cve/CVE-2026-99271
- https://git.kernel.org/stable/c/22c82f33ff0b68d37041adf1dea5533a5863cd31
- https://git.kernel.org/stable/c/862d9268f40a6e10cef24eb226e738fb69ce8aa7
- https://git.kernel.org/stable/c/aa118c8f61d59387961d58ffae831c5259a9f222