Bug 2536351 (CVE-2026-90382) - CVE-2026-90382 kernel: wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length
Summary: CVE-2026-90382 kernel: wifi: mt76: mt76x02: do not WARN on invalid rx descrip...
Keywords:
Status: NEW
Alias: CVE-2026-90382
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 17:32 UTC by OSIDB Bzimport
Modified: 2026-10-20 10:59 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-09-17 17:32:05 UTC
In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length

The MPDU length in the rx descriptor comes from the hardware. In
monitor mode with the fcsfail filter enabled, the hardware passes up
corrupted frames, and a corrupted frame can report a length larger
than the received buffer. The bounds check correctly discards such
frames, but its WARN_ON_ONCE wrapper means any over-the-air garbage
frame taints the kernel, and panics it on the first such frame when
panic_on_warn is set.

Drop the WARN and discard the frame silently, matching what
commit c2d4c8723dbf ("mt76x2: remove some harmless WARN_ONs in tx
status and rx path") did for the neighboring rx and tx status paths.

Observed immediately on rx with an MT7612U in fcsfail monitor mode
on a busy channel.


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