In the Linux kernel, the following vulnerability has been resolved: 8021q: delete cleared egress QoS mappings vlan_dev_set_egress_priority()… (CVE-2026-46153)
A memory leak vulnerability in the Linux kernel's 802.1Q VLAN egress QoS mapping implementation was resolved. The issue involved the vlan_dev_set_egress_priority() function retaining cleared egress priority mappings as tombstones, causing accumulation of mapping nodes and memory leaks during repeated set/clear cycles. The fix deletes mappings when vlan_prio is cleared, safely unlinking and freeing nodes after a grace period. This vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. The issue has been patched and updates are available from Ubuntu and other Linux distributors.
AI Analysis
Technical Summary
The Linux kernel had a vulnerability in the 802.1Q VLAN protocol implementation where the vlan_dev_set_egress_priority() function kept cleared egress priority mappings in the hash as tombstones. This caused memory leaks due to accumulation of mapping nodes during repeated set/clear cycles with distinct skb priorities until device teardown. The fix involves deleting mappings when vlan_prio is cleared instead of retaining tombstones. The egress mapping lists are now RCU protected, allowing safe unlinking and freeing of nodes after a grace period. This vulnerability is tracked as CVE-2026-46153 and affects Linux kernel versions prior to 7.0.0-28.28 and related variants. The issue has been addressed in official Linux kernel updates distributed by Ubuntu and others.
Potential Impact
The vulnerability causes memory leaks in the Linux kernel's VLAN egress QoS mapping subsystem, which can lead to resource exhaustion and potential denial of service conditions. There is no impact on confidentiality or integrity. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to versions 7.0.0-28.28 or later and corresponding patched builds as provided by the vendor. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow vendor instructions for updating and rebuilding kernel modules. No additional mitigation is required beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: 8021q: delete cleared egress QoS mappings vlan_dev_set_egress_priority()… (CVE-2026-46153)
Description
A memory leak vulnerability in the Linux kernel's 802.1Q VLAN egress QoS mapping implementation was resolved. The issue involved the vlan_dev_set_egress_priority() function retaining cleared egress priority mappings as tombstones, causing accumulation of mapping nodes and memory leaks during repeated set/clear cycles. The fix deletes mappings when vlan_prio is cleared, safely unlinking and freeing nodes after a grace period. This vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. The issue has been patched and updates are available from Ubuntu and other Linux distributors.
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? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel had a vulnerability in the 802.1Q VLAN protocol implementation where the vlan_dev_set_egress_priority() function kept cleared egress priority mappings in the hash as tombstones. This caused memory leaks due to accumulation of mapping nodes during repeated set/clear cycles with distinct skb priorities until device teardown. The fix involves deleting mappings when vlan_prio is cleared instead of retaining tombstones. The egress mapping lists are now RCU protected, allowing safe unlinking and freeing of nodes after a grace period. This vulnerability is tracked as CVE-2026-46153 and affects Linux kernel versions prior to 7.0.0-28.28 and related variants. The issue has been addressed in official Linux kernel updates distributed by Ubuntu and others.
Potential Impact
The vulnerability causes memory leaks in the Linux kernel's VLAN egress QoS mapping subsystem, which can lead to resource exhaustion and potential denial of service conditions. There is no impact on confidentiality or integrity. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to versions 7.0.0-28.28 or later and corresponding patched builds as provided by the vendor. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow vendor instructions for updating and rebuilding kernel modules. No additional mitigation is required beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46153
- 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
- 3.1
Threat ID: 6a5a01eb91ae9bcd3f82fc5d
Added to database: 07/17/2026, 10:20:27 UTC
Last enriched: 09/08/2026, 00:38:03 UTC
Last updated: 09/14/2026, 22:01:34 UTC
Views: 24
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