Bug 2513471 (CVE-2026-68311)

Summary: CVE-2026-68311 kernel: wifi: mt76: mt7925: guard link STA in decap offload
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: 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 `wifi: mt76: mt7925` driver. When handling Multi-Link Operation (MLO) stations, the `mt7925_sta_set_decap_offload()` function can attempt to dereference a null pointer if a station link is not properly associated with a Virtual Interface (VIF) link. This can lead to a system crash, resulting in a Denial of Service (DoS) for an affected system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-10 12:39:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7925: guard link STA in decap offload

mt7925_sta_set_decap_offload() iterates over the vif valid_links mask
when updating decap offload state for an MLO station. The station may not
have a link STA for every valid link of the vif, so mt792x_sta_to_link()
can return NULL for a link that belongs to the vif but not to the station.

The function currently dereferences mlink before checking whether the
link WCID is ready. If mlink is NULL, setting or clearing
MT_WCID_FLAG_HDR_TRANS dereferences a NULL pointer.

Skip links without a station link before touching mlink->wcid.
Comment 1 Mauro Matteo Cascella 2026-08-11 09:17:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081031-CVE-2026-68311-e53f@gregkh/T