Bug 2540474 (CVE-2026-93807)

Summary: CVE-2026-93807 kernel: wifi: rsi: avoid reading TKIP MIC keys for non-TKIP ciphers
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Redpine Signals (RSI) Wi-Fi driver. An attacker can trigger a Denial of Service (DoS) or information disclosure by configuring wireless encryption keys for ciphers with shorter key lengths than the Temporal Key Integrity Protocol (TKIP). The driver unconditionally reads key data from fixed memory offsets intended only for 32-byte TKIP keys, causing an out-of-bounds memory read when shorter key buffers are processed.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-24 16:58:09 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: rsi: avoid reading TKIP MIC keys for non-TKIP ciphers

rsi_hal_load_key() copies tx_mic_key and rx_mic_key from data[16] and
data[24] whenever key data is present. Those offsets are only part of
the 32-byte TKIP key layout. Shorter keys used by other ciphers, such as
CCMP, do not provide those bytes, so the unconditional copies can read
past the supplied key buffer.

Only copy the MIC keys for TKIP, and reject malformed TKIP keys that are
shorter than the expected 32-byte layout.

[drop useless length check]
Comment 1 Mauro Matteo Cascella 2026-09-28 12:52:01 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93807.mbox