CVE-2026-80944
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the mwifiex Wi-Fi driver fails to detach the caller-provided data buffer from a still-current synchronous command when the wait is interrupted. A late firmware response can then write through a stale stack pointer, causing kernel stack corruption and a panic.
Risk Assessment
The vulnerability can cause kernel memory corruption and system panic (denial of service), especially during repeated association and disassociation cycles. In the worst case, stack corruption could be exploited for code execution in kernel context.
Recommendation
Update the Linux kernel to a version containing the fix that detaches the caller-owned data buffer from the current command after an interrupted or timed-out wait. If patching is not possible, consider restricting use of affected Wi-Fi cards (e.g., 88W8997) on exposed devices.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

