Bug 2482641 (CVE-2026-46163)

Summary: CVE-2026-46163 kernel: wifi: b43legacy: enforce bounds check on firmware key index in RX path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `b43legacy` Wi-Fi driver. A remote attacker could exploit this vulnerability by sending specially crafted Wi-Fi frames, causing the firmware-controlled key index in the receive path to exceed its allocated bounds. This out-of-bounds read could lead to information disclosure from kernel memory or a denial of service.
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Description OSIDB Bzimport 2026-05-28 11:07:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: b43legacy: enforce bounds check on firmware key index in RX path

Same fix as b43: the firmware-controlled key index in b43legacy_rx()
can exceed dev->max_nr_keys. The existing B43legacy_WARN_ON is
non-enforcing in production builds, allowing an out-of-bounds read of
dev->key[].

Make the check enforcing by dropping the frame for invalid indices.
Comment 1 Keith Grant 2026-05-28 15:36:17 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052825-CVE-2026-46163-171e@gregkh/T