Bug 2516752 (CVE-2026-74324)

Summary: CVE-2026-74324 kernel: wifi: mt76: mt7925: validate skb length in testmode query
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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Doc Text:
A flaw was found in the `mt7925` Wi-Fi driver of the Linux kernel. An attacker could exploit this vulnerability by providing a specially crafted firmware response during a test mode query. This improper validation of the response length can lead to a buffer over-read, potentially disclosing sensitive information from the kernel's memory to userspace.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-15 06:31:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7925: validate skb length in testmode query

In mt7925_tm_query(), the response skb from mt76_mcu_send_and_get_msg()
is used in a memcpy without validating its length:

  memcpy(evt_resp, skb->data + 8, MT7925_EVT_RSP_LEN);

where MT7925_EVT_RSP_LEN is 512. If the firmware returns a response
shorter than 520 bytes (8 + 512), this reads beyond the skb data
buffer. The over-read data is then returned to userspace via nla_put()
in mt7925_testmode_dump().

Add a length check before the memcpy to ensure the skb contains
sufficient data.
Comment 1 Keith Grant 2026-08-20 16:59:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081554-CVE-2026-74324-d245@gregkh/T