Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon This patch is… (CVE-2026-64325)
A NULL pointer dereference vulnerability in the Linux kernel's mt76 wifi driver for mt7921 and mt7925 chipsets has been fixed. The flaw occurs when a channel-switch announcement (CSA) beacon is received and a queued work item runs after the station disconnects, causing a NULL pointer dereference in mt7921_channel_switch_rx_beacon() or mt7925_channel_switch_rx_beacon(). This results in a kernel crash (BUG). The issue affects specific linux-hwe-edge kernel versions prior to 7.0.0-31.31 and related builds. A patch is available and included in updated Ubuntu kernel packages.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's mt76 wifi driver (mt7921 and mt7925) involves a NULL pointer dereference triggered by a channel-switch announcement (CSA) beacon. When the CSA beacon is received, cfg80211 queues a work item that calls mt7921_channel_switch_rx_beacon(). If the station disconnects or the channel context is torn down before the work runs, the driver's dev->new_ctx pointer is NULL. The function then dereferences this pointer unconditionally, causing a kernel NULL pointer dereference and crash. The same issue exists in mt7925_channel_switch_rx_beacon(). This flaw has been resolved in patched kernel versions.
Potential Impact
Successful exploitation causes a kernel NULL pointer dereference leading to a system crash (denial of service). There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) reflecting local attack vector with low privileges required and no user interaction needed. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages for Ubuntu linux-hwe-edge and related kernels. Users should apply the official kernel updates and reboot their systems to remediate this vulnerability. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating to the fixed kernel versions.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921/mt7925: fix NULL dereference in CSA beacon This patch is… (CVE-2026-64325)
Description
A NULL pointer dereference vulnerability in the Linux kernel's mt76 wifi driver for mt7921 and mt7925 chipsets has been fixed. The flaw occurs when a channel-switch announcement (CSA) beacon is received and a queued work item runs after the station disconnects, causing a NULL pointer dereference in mt7921_channel_switch_rx_beacon() or mt7925_channel_switch_rx_beacon(). This results in a kernel crash (BUG). The issue affects specific linux-hwe-edge kernel versions prior to 7.0.0-31.31 and related builds. A patch is available and included in updated Ubuntu kernel packages.
CVSS v3.1
Score 5.5medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's mt76 wifi driver (mt7921 and mt7925) involves a NULL pointer dereference triggered by a channel-switch announcement (CSA) beacon. When the CSA beacon is received, cfg80211 queues a work item that calls mt7921_channel_switch_rx_beacon(). If the station disconnects or the channel context is torn down before the work runs, the driver's dev->new_ctx pointer is NULL. The function then dereferences this pointer unconditionally, causing a kernel NULL pointer dereference and crash. The same issue exists in mt7925_channel_switch_rx_beacon(). This flaw has been resolved in patched kernel versions.
Potential Impact
Successful exploitation causes a kernel NULL pointer dereference leading to a system crash (denial of service). There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) reflecting local attack vector with low privileges required and no user interaction needed. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages for Ubuntu linux-hwe-edge and related kernels. Users should apply the official kernel updates and reboot their systems to remediate this vulnerability. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating to the fixed kernel versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6c49-xc7v-mqvw
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64325"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420d9c2644c7f80859f6
Added to database: 07/25/2026, 23:09:01 UTC
Last enriched: 09/07/2026, 18:09:44 UTC
Last updated: 09/07/2026, 22:52:14 UTC
Views: 51
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