Linux azure: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case… (CVE-2026-23272)
A vulnerability in the Linux kernel's netfilter nf_tables subsystem was resolved. The issue involved unconditionally incrementing the set->nelems counter before insertion, which could lead to a race condition where a new element is published and removed without waiting for the RCU grace period, potentially causing use-after-free scenarios. The fix involves safely handling the insertion when the set is full by toggling a set_full flag and properly unwinding the set state. This vulnerability affects multiple Linux Azure kernel versions prior to specific fixed releases. A patch is available and included in updated Linux kernel packages. Users should update and reboot their systems to apply the fix.
AI Analysis
Technical Summary
The Linux kernel netfilter nf_tables subsystem had a vulnerability where the set->nelems counter was incremented unconditionally before inserting elements. If the set was full, a new element could be published and then removed without waiting for the RCU grace period, risking concurrent RCU readers accessing freed memory. The fix adds the element transaction even if the set is full but toggles a set_full flag to return an error and safely revert the set to its previous state. This avoids the need for synchronize_rcu() calls that could slow down batch insertions. The vulnerability affects multiple Linux Azure kernel versions prior to 4.15.0-253.265, 4.15.0-1194.207, 5.4.0-1161.172~18.04.1, 4.15.0-1204.219, and 5.4.0-1166.172~18.04.1. The issue is tracked as CVE-2026-23272 with a CVSS 3.1 score of 7.8 (high impact on confidentiality, integrity, and availability). Ubuntu has released patched kernel versions and advises users to update and reboot. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled after updating.
Potential Impact
Successful exploitation could allow an attacker with local privileges to cause use-after-free conditions in the kernel, potentially leading to system compromise including arbitrary code execution or denial of service. The CVSS score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and low complexity. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages. Users should apply the updates corresponding to their distribution and kernel version and reboot the system to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled after updating. No additional mitigation steps are indicated by the vendor advisory.
Linux azure: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case… (CVE-2026-23272)
Description
A vulnerability in the Linux kernel's netfilter nf_tables subsystem was resolved. The issue involved unconditionally incrementing the set->nelems counter before insertion, which could lead to a race condition where a new element is published and removed without waiting for the RCU grace period, potentially causing use-after-free scenarios. The fix involves safely handling the insertion when the set is full by toggling a set_full flag and properly unwinding the set state. This vulnerability affects multiple Linux Azure kernel versions prior to specific fixed releases. A patch is available and included in updated Linux kernel packages. Users should update and reboot their systems to apply the fix.
CVSS v3.1
Score 7.8high
Affected software
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protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?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=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel netfilter nf_tables subsystem had a vulnerability where the set->nelems counter was incremented unconditionally before inserting elements. If the set was full, a new element could be published and then removed without waiting for the RCU grace period, risking concurrent RCU readers accessing freed memory. The fix adds the element transaction even if the set is full but toggles a set_full flag to return an error and safely revert the set to its previous state. This avoids the need for synchronize_rcu() calls that could slow down batch insertions. The vulnerability affects multiple Linux Azure kernel versions prior to 4.15.0-253.265, 4.15.0-1194.207, 5.4.0-1161.172~18.04.1, 4.15.0-1204.219, and 5.4.0-1166.172~18.04.1. The issue is tracked as CVE-2026-23272 with a CVSS 3.1 score of 7.8 (high impact on confidentiality, integrity, and availability). Ubuntu has released patched kernel versions and advises users to update and reboot. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled after updating.
Potential Impact
Successful exploitation could allow an attacker with local privileges to cause use-after-free conditions in the kernel, potentially leading to system compromise including arbitrary code execution or denial of service. The CVSS score of 7.8 reflects high impact on confidentiality, integrity, and availability. However, exploitation requires local access and low complexity. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages. Users should apply the updates corresponding to their distribution and kernel version and reboot the system to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled after updating. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23272
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu: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"]
- Cvss Version
- 3.1
Threat ID: 6a58b4e168715ace43daf09a
Added to database: 07/16/2026, 10:39:29 UTC
Last enriched: 08/01/2026, 06:51:42 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 22
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