In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task… (CVE-2026-46180)
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task Watchdog task might end between send_sig() and kthread_stop() calls, what results in the use-after-free issue. Fix this by increasing watchdog task reference count before calling send_sig() and dropping it by switching to kthread_stop_put().
AI Analysis
Technical Summary
The Linux kernel's brcmfmac WiFi driver contained a use-after-free vulnerability triggered when stopping the watchdog task. The watchdog task could terminate between the send_sig() and kthread_stop() calls, causing a use-after-free condition. The patch increases the watchdog task's reference count before calling send_sig() and releases it correctly using kthread_stop_put(), preventing the use-after-free scenario. This vulnerability affects several Ubuntu kernel versions prior to 6.8.0-1061.64~22.04.1 and similar builds.
Potential Impact
Successful exploitation of this vulnerability could lead to a use-after-free condition, potentially allowing an attacker with local privileges to cause memory corruption. The CVSS vector indicates high impact on confidentiality, integrity, and availability (C:H/I:H/A:H), meaning an attacker could execute arbitrary code, cause system crashes, or escalate privileges.
Mitigation Recommendations
A fix is available and has been applied in Linux kernel versions 6.8.0-1061.64~22.04.1 and later (and related builds). Users and administrators should update their Linux kernel to these fixed versions or later to mitigate this vulnerability. No additional mitigation steps are indicated beyond applying the official patch.
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task… (CVE-2026-46180)
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task Watchdog task might end between send_sig() and kthread_stop() calls, what results in the use-after-free issue. Fix this by increasing watchdog task reference count before calling send_sig() and dropping it by switching to kthread_stop_put().
CVSS v3.1
Score 7.8high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's brcmfmac WiFi driver contained a use-after-free vulnerability triggered when stopping the watchdog task. The watchdog task could terminate between the send_sig() and kthread_stop() calls, causing a use-after-free condition. The patch increases the watchdog task's reference count before calling send_sig() and releases it correctly using kthread_stop_put(), preventing the use-after-free scenario. This vulnerability affects several Ubuntu kernel versions prior to 6.8.0-1061.64~22.04.1 and similar builds.
Potential Impact
Successful exploitation of this vulnerability could lead to a use-after-free condition, potentially allowing an attacker with local privileges to cause memory corruption. The CVSS vector indicates high impact on confidentiality, integrity, and availability (C:H/I:H/A:H), meaning an attacker could execute arbitrary code, cause system crashes, or escalate privileges.
Mitigation Recommendations
A fix is available and has been applied in Linux kernel versions 6.8.0-1061.64~22.04.1 and later (and related builds). Users and administrators should update their Linux kernel to these fixed versions or later to mitigate this vulnerability. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46180
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a01d791ae9bcd3f82c837
Added to database: 07/17/2026, 10:20:07 UTC
Last enriched: 07/30/2026, 14:24:22 UTC
Last updated: 07/31/2026, 19:30:21 UTC
Views: 3
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