Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: always walk all pending catchall elements During… (CVE-2026-23278)
A vulnerability in the Linux kernel's netfilter nf_tables subsystem could cause improper handling of multiple pending catchall elements during transaction processing. This flaw may lead to kernel warnings and potential system compromise. The issue affects certain Linux kernel versions prior to 5.15.0-1111.118~20.04.1 and related versions. Ubuntu has released patches addressing this and other kernel vulnerabilities. Users should update to the fixed kernel versions and reboot to apply the changes. Due to ABI changes, recompilation of third-party kernel modules may be necessary.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel netfilter nf_tables subsystem arises when multiple catchall elements exist during transaction processing, specifically when a map holding these elements is being removed. The kernel failed to toggle all catchall elements, only handling the first viable candidate, leading to kernel warnings and potential instability. This flaw was resolved by ensuring all pending catchall elements are properly walked and toggled. The issue affects Linux kernel versions prior to 5.15.0-1111.118~20.04.1 and similar versions in the Ubuntu 20.04 LTS kernel series. Ubuntu security advisories USN-8490-1 and USN-8491-1 confirm the availability of patches and recommend updating to kernel versions 6.17.0-40.40 and later for generic and OEM kernels. The CVSS v3.1 score is 7.8, indicating high impact on confidentiality, integrity, and availability with low attack vector complexity but requiring local privileges.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker with limited privileges to cause kernel instability or potentially escalate privileges due to improper handling of netfilter nf_tables catchall elements. The CVSS score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and privileges. There are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of their Linux kernel updates (see USN-8490-1 and USN-8491-1). Users should update their systems to the fixed kernel versions (e.g., linux-image-6.17.0-40.40 or later) and reboot to apply the changes. Due to an ABI change in the kernel, recompilation and reinstallation of any third-party kernel modules are required after the update. No additional mitigation steps are indicated by the vendor.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: always walk all pending catchall elements During… (CVE-2026-23278)
Description
A vulnerability in the Linux kernel's netfilter nf_tables subsystem could cause improper handling of multiple pending catchall elements during transaction processing. This flaw may lead to kernel warnings and potential system compromise. The issue affects certain Linux kernel versions prior to 5.15.0-1111.118~20.04.1 and related versions. Ubuntu has released patches addressing this and other kernel vulnerabilities. Users should update to the fixed kernel versions and reboot to apply the changes. Due to ABI changes, recompilation of third-party kernel modules may be necessary.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email 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protected]?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]~24.04.1?arch=source&distro=realtime/noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel netfilter nf_tables subsystem arises when multiple catchall elements exist during transaction processing, specifically when a map holding these elements is being removed. The kernel failed to toggle all catchall elements, only handling the first viable candidate, leading to kernel warnings and potential instability. This flaw was resolved by ensuring all pending catchall elements are properly walked and toggled. The issue affects Linux kernel versions prior to 5.15.0-1111.118~20.04.1 and similar versions in the Ubuntu 20.04 LTS kernel series. Ubuntu security advisories USN-8490-1 and USN-8491-1 confirm the availability of patches and recommend updating to kernel versions 6.17.0-40.40 and later for generic and OEM kernels. The CVSS v3.1 score is 7.8, indicating high impact on confidentiality, integrity, and availability with low attack vector complexity but requiring local privileges.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker with limited privileges to cause kernel instability or potentially escalate privileges due to improper handling of netfilter nf_tables catchall elements. The CVSS score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and privileges. There are no known exploits in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of their Linux kernel updates (see USN-8490-1 and USN-8491-1). Users should update their systems to the fixed kernel versions (e.g., linux-image-6.17.0-40.40 or later) and reboot to apply the changes. Due to an ABI change in the kernel, recompilation and reinstallation of any third-party kernel modules are required after the update. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23278
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates: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"]
- Cvss Version
- 3.1
Threat ID: 6a58b4e168715ace43daf066
Added to database: 07/16/2026, 10:39:29 UTC
Last enriched: 08/01/2026, 06:49:10 UTC
Last updated: 09/11/2026, 22:06:32 UTC
Views: 27
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