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NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package kernel-doc  (opens in a new tab)

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0.19% (9th percentile)

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  • Snyk IDSNYK-RHEL6-KERNELDOC-13599252
  • published17 Oct 2025
  • disclosed15 Oct 2025
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Introduced: 15 Oct 2025

CVE-2025-39997  (opens in a new tab)
CWE-476  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:6.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by RHEL.

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: fix race condition to UAF in snd_usbmidi_free

The previous commit 0718a78f6a9f ("ALSA: usb-audio: Kill timer properly at removal") patched a UAF issue caused by the error timer.

However, because the error timer kill added in this patch occurs after the endpoint delete, a race condition to UAF still occurs, albeit rarely.

Additionally, since kill-cleanup for urb is also missing, freed memory can be accessed in interrupt context related to urb, which can cause UAF.

Therefore, to prevent this, error timer and urb must be killed before freeing the heap memory.