CVE-2026-80944

Status: UPDATED  |  Advisory ID: CVE-2026-80944

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References