Linux aws: In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on… (CVE-2026-23001)
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/[email protected]/T/#u
AI Analysis
Technical Summary
CVE-2026-23001 addresses a use-after-free vulnerability in the Linux kernel's macvlan driver, specifically in the macvlan_forward_source() function. The fix involves adding Read-Copy-Update (RCU) protection on the vlan pointer within the macvlan_source_entry structure to prevent access to freed memory. When macvlan_hash_del_source() is called, the vlan pointer is cleared before the RCU grace period, allowing macvlan_forward_source() to skip entries queued for freeing. This vulnerability affects linux-aws kernel versions prior to 5.15.0-1105.112~20.04.1 and related versions. The vulnerability has a CVSS 3.1 score of 7.8 (high severity) with impact on confidentiality, integrity, and availability. Ubuntu has issued official patches and advises users to update and reboot.
Potential Impact
Successful exploitation could lead to use-after-free memory access, potentially allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The vulnerability affects the macvlan network driver in the Linux kernel, which could be leveraged to cause system instability or unauthorized code execution. However, no known exploits in the wild have been reported.
Mitigation Recommendations
An official patch is available and has been released by Ubuntu for affected linux-aws kernel versions. Users should update their systems to the fixed package versions (e.g., linux-image-5.15.0-1105-aws 5.15.0-1105.112~20.04.1) and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions carefully to ensure full remediation.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on… (CVE-2026-23001)
Description
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/[email protected]/T/#u
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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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
CVE-2026-23001 addresses a use-after-free vulnerability in the Linux kernel's macvlan driver, specifically in the macvlan_forward_source() function. The fix involves adding Read-Copy-Update (RCU) protection on the vlan pointer within the macvlan_source_entry structure to prevent access to freed memory. When macvlan_hash_del_source() is called, the vlan pointer is cleared before the RCU grace period, allowing macvlan_forward_source() to skip entries queued for freeing. This vulnerability affects linux-aws kernel versions prior to 5.15.0-1105.112~20.04.1 and related versions. The vulnerability has a CVSS 3.1 score of 7.8 (high severity) with impact on confidentiality, integrity, and availability. Ubuntu has issued official patches and advises users to update and reboot.
Potential Impact
Successful exploitation could lead to use-after-free memory access, potentially allowing an attacker with local privileges to compromise system confidentiality, integrity, and availability. The vulnerability affects the macvlan network driver in the Linux kernel, which could be leveraged to cause system instability or unauthorized code execution. However, no known exploits in the wild have been reported.
Mitigation Recommendations
An official patch is available and has been released by Ubuntu for affected linux-aws kernel versions. Users should update their systems to the fixed package versions (e.g., linux-image-5.15.0-1105-aws 5.15.0-1105.112~20.04.1) and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions carefully to ensure full remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23001
- 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"]
- Cvss Version
- 4.0
Threat ID: 6a5b636f2d1edb114c8b46f9
Added to database: 07/18/2026, 11:28:47 UTC
Last enriched: 08/19/2026, 08:04:45 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 9
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