CVE-2026-80944 | 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
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.
- 🔗 git.kernel.org/stable/c/8c67b8c50286e0cb7f18d667e6a37a2e…
- 🔗 git.kernel.org/stable/c/9024c7729eb523cf4f3a4203966d3a4a…
- 🔗 git.kernel.org/stable/c/9e06c9c8a1f10c55d9bc5d139656d587…
- 🔗 git.kernel.org/stable/c/f2134d6ff30cd6e1bf63d6b0a5d8e083…
- 🔗 git.kernel.org/stable/c/20ee9c03f261bf6ac59331e2ca7b46b2…
- 🔗 git.kernel.org/stable/c/b1bbeb8970eeb6c6bf3cd5314138103f…
- 🔗 git.kernel.org/stable/c/d29a165588b6a0cf7a38db5cbd602aef…
- 🔗 git.kernel.org/stable/c/ef06882c7d8a7400b67d0d003b100809…
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CVE-2026-80944 | 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
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 st