Bug 2555224 (CVE-2026-98830)

Summary: CVE-2026-98830 kernel: kernel: Denial of Service via buffer overflow in WFx Wi-Fi driver
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Silicon Labs WFx Wi-Fi driver. The driver fails to validate the length of firmware responses during Management Information Base (MIB) queries before copying the data into memory buffers. A compromised or malicious wireless device could supply an oversized response, causing a buffer overflow that leads to memory corruption and a Denial of Service (DoS) via a system crash.
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Description OSIDB Bzimport 2026-10-18 16:03:00 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: wfx: validate MIB read length before copying to caller

wfx_hif_read_mib() copies reply->length bytes from the firmware
response into the caller-provided buffer without checking that
reply->length does not exceed val_len. A firmware response with
a length field larger than expected overruns the caller buffer and
reads past the end of the reply allocation.

Replace the dead -ENOMEM check with an active validation that
reply->length fits within val_len before the memcpy.