# CVE-2026-80944

## Summary

- **CVE ID:** CVE-2026-80944
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

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

wifi: mwifiex: Detach sync cmd buffer on interrupted wait

mwifiex synchronous commands keep the caller-provided data buffer in
cmd_node->data_buf. Several callers pass stack-allocated objects there.

If wait_event_interruptible_timeout() is interrupted, the caller can
return and release that stack object while the firmware command is still
the current command. A late firmware response then reaches the normal
response handler, which can copy data through cmd_node->data_buf into the
stale stack address.

This fixes a stack corruption observed during repeated association and
disassociation cycles. The panic trace showed the command wait being
interrupted immediately before a bad pointer dereference:

  cmd_wait_q terminated: -512
  Unable to handle kernel paging request at virtual address 002c583837384662
  Kernel panic - not syncing: stack-protector: Kernel stack is corrupted
  ...
  Tainted: [M]=MACHINE_CHECK

The fault address decodes as little-endian ASCII:

  0x002c583837384662 -> "bF878X,\0"

which is a fragment of the VERSION_EXT firmware string exposed as
debugfs "verext":

  w8997o-V4, RF878X, FP92, 16.92.21.p153.7

The same runs also showed corrupted control data containing:

  0x2400372e333531 -> "153.7\0$"

which is the tail of the same VERSION_EXT string. This points at a late
VERSION_EXT response writing through a stale stack-backed data_buf after
the interrupted wait returned.

After cancelling pending commands on an interrupted or timed-out wait,
detach the caller-owned data buffer from the still-current command. This
preserves the existing command cancellation behaviour while preventing a
late response from writing through a pointer whose lifetime ended with the
waiting caller.

Tested on an i.MX8MP board using an 88W8997.

## Affected Products

- Linux — Linux (3d026d09b28dda24777129a931634949c75a9181)
- Linux — Linux (3.15)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/20ee9c03f261bf6ac59331e2ca7b46b23646412a)
- [CNA](https://git.kernel.org/stable/c/b1bbeb8970eeb6c6bf3cd5314138103f7b69446d)
- [CNA](https://git.kernel.org/stable/c/d29a165588b6a0cf7a38db5cbd602aef7ef8c658)
- [CNA](https://git.kernel.org/stable/c/ef06882c7d8a7400b67d0d003b1008093dd589ed)
- [CNA](https://git.kernel.org/stable/c/8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9)
- [CNA](https://git.kernel.org/stable/c/9024c7729eb523cf4f3a4203966d3a4aaabf030d)
- [CNA](https://git.kernel.org/stable/c/9e06c9c8a1f10c55d9bc5d139656d58795e64483)
- [CNA](https://git.kernel.org/stable/c/f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._