High [CVE-2026-63866] Clear wcid pointer in mt7996_mac_sta_deinit_link
This high-severity Red Hat Linux advisory covers CVE-2026-63866.
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Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: Clear wcid pointer in mt7996_mac_sta_deinit_link() Clear WCID pointer removing the sta link in mt7996_mac_sta_deinit_link routine. A flaw was found in the Linux kernel's mt76 Wi-Fi driver for mt7996 devices.
This vulnerability occurs when the `mt7996_mac_sta_deinit_link()` routine fails to properly clear a Wireless Client ID (WCID) pointer when removing a station link. This improper handling of the WCID pointer may lead to a resource management issue, potentially causing system instability or a denial of service.
This can result in a use-after-free condition that may cause a kernel panic and denial of service, with memory corruption possible in the worst case.
Upstream CVEORG rates this flaw 8.8 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) while Red Hat rates it 7.0 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, IMPORTANT); as no shipped Red Hat product contains the vulnerable code, this severity difference has no practical consequence for Red Hat customers. Weakness: CWE-825.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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