In the Linux kernel, the following vulnerability has been resolved: selinux: allow multiple opens of /sys/fs/selinux/policy Currently there can only… (CVE-2026-46302)
A vulnerability in the Linux kernel SELinux subsystem allowed only a single open of /sys/fs/selinux/policy at a time, enabling a process to block others from reading the kernel policy. This behavior could cause denial of service by preventing access to the policy. The issue has been resolved by removing the policy_opened flag and reducing the critical section protected by the policy mutex. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied to mitigate the issue.
AI Analysis
Technical Summary
The Linux kernel SELinux subsystem previously restricted access to /sys/fs/selinux/policy to a single open at any time, which allowed a process to block other processes from reading the kernel policy, effectively causing a denial of service. The original design aimed to prevent inconsistent views of the policy size and unbounded kernel memory allocation by userspace, but this restriction was problematic. The fix removes the policy_opened flag and shrinks the critical section guarded by the policy mutex, allowing multiple concurrent opens of the policy file. This vulnerability is tracked as CVE-2026-46302 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related variants. The issue has been addressed in official Linux kernel updates.
Potential Impact
This vulnerability can be exploited locally to cause a denial of service by blocking other processes from reading the SELinux kernel policy. It does not impact confidentiality or integrity but affects availability of the policy data. There is no indication of privilege escalation or remote exploitation. The CVSS score is 5.5 (medium severity), reflecting the local attack vector and denial of service impact.
Mitigation Recommendations
A patch is available and has been released by the Linux kernel maintainers and Ubuntu. Users should update their Linux kernel packages to versions 7.0.0-28.28 or later (and corresponding patched builds) to resolve this issue. After updating, a system reboot is required to apply the fix. No additional mitigation steps are necessary beyond applying the official update.
In the Linux kernel, the following vulnerability has been resolved: selinux: allow multiple opens of /sys/fs/selinux/policy Currently there can only… (CVE-2026-46302)
Description
A vulnerability in the Linux kernel SELinux subsystem allowed only a single open of /sys/fs/selinux/policy at a time, enabling a process to block others from reading the kernel policy. This behavior could cause denial of service by preventing access to the policy. The issue has been resolved by removing the policy_opened flag and reducing the critical section protected by the policy mutex. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied to mitigate the issue.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel SELinux subsystem previously restricted access to /sys/fs/selinux/policy to a single open at any time, which allowed a process to block other processes from reading the kernel policy, effectively causing a denial of service. The original design aimed to prevent inconsistent views of the policy size and unbounded kernel memory allocation by userspace, but this restriction was problematic. The fix removes the policy_opened flag and shrinks the critical section guarded by the policy mutex, allowing multiple concurrent opens of the policy file. This vulnerability is tracked as CVE-2026-46302 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related variants. The issue has been addressed in official Linux kernel updates.
Potential Impact
This vulnerability can be exploited locally to cause a denial of service by blocking other processes from reading the SELinux kernel policy. It does not impact confidentiality or integrity but affects availability of the policy data. There is no indication of privilege escalation or remote exploitation. The CVSS score is 5.5 (medium severity), reflecting the local attack vector and denial of service impact.
Mitigation Recommendations
A patch is available and has been released by the Linux kernel maintainers and Ubuntu. Users should update their Linux kernel packages to versions 7.0.0-28.28 or later (and corresponding patched builds) to resolve this issue. After updating, a system reboot is required to apply the fix. No additional mitigation steps are necessary beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46302
- Osv Schema Version
- 1.7.0
- 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"]
- Cvss Version
- 4.0
Threat ID: 6a5a019191ae9bcd3f80524a
Added to database: 07/17/2026, 10:18:58 UTC
Last enriched: 09/07/2026, 23:57:22 UTC
Last updated: 09/14/2026, 10:01:31 UTC
Views: 25
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