Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: af_unix: Drop all SCM attributes for SOCKMAP. (CVE-2026-53005)
A vulnerability in the Linux kernel's AF_UNIX socket implementation related to SOCKMAP handling has been resolved. The issue involves inflight file descriptors being hidden from garbage collection, leading to resource leaks and a use-after-free condition. Additionally, incorrect file descriptor counts could be reported due to improper handling of SCM attributes. This vulnerability has been assigned CVE-2026-53005 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available to drop all SCM attributes before passing skb to the SOCKMAP layer, mitigating the issue.
AI Analysis
Technical Summary
CVE-2026-53005 addresses a flaw in the Linux kernel's AF_UNIX socket subsystem where SOCKMAP can hide inflight file descriptors from the AF_UNIX garbage collector. When a socket in SOCKMAP receives an skb containing inflight file descriptors, the kernel's sk_psock_verdict_data_ready() function enqueues the skb to the psock ingress queue, which is not inspected by garbage collection, causing leaks of inflight sockets. This also breaks the Tarjan-based garbage collector's assumption that unix_edge.successor is always alive, resulting in a use-after-free vulnerability. Furthermore, SOCKMAP does not properly call scm_stat_del(), causing unix_show_fdinfo() to report incorrect file descriptor counts. The fix involves dropping all SCM attributes before skb is passed to the SOCKMAP layer.
Potential Impact
The vulnerability allows inflight file descriptors to be hidden from garbage collection, causing resource leaks and potential use-after-free conditions in the kernel. This can lead to system instability, denial of service, or privilege escalation due to corrupted kernel state. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, exploitation requires local access with low privileges and no user interaction.
Mitigation Recommendations
An official patch is available and should be applied promptly. The vendor advisory from Ubuntu confirms that updating to the fixed Linux kernel versions resolves this issue. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigations are necessary beyond applying the official update.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: af_unix: Drop all SCM attributes for SOCKMAP. (CVE-2026-53005)
Description
A vulnerability in the Linux kernel's AF_UNIX socket implementation related to SOCKMAP handling has been resolved. The issue involves inflight file descriptors being hidden from garbage collection, leading to resource leaks and a use-after-free condition. Additionally, incorrect file descriptor counts could be reported due to improper handling of SCM attributes. This vulnerability has been assigned CVE-2026-53005 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available to drop all SCM attributes before passing skb to the SOCKMAP layer, mitigating the issue.
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]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=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]?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 protected]~18.04.2?arch=source&distro=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=bionicpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.2?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]+cvm1.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.3?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email 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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
CVE-2026-53005 addresses a flaw in the Linux kernel's AF_UNIX socket subsystem where SOCKMAP can hide inflight file descriptors from the AF_UNIX garbage collector. When a socket in SOCKMAP receives an skb containing inflight file descriptors, the kernel's sk_psock_verdict_data_ready() function enqueues the skb to the psock ingress queue, which is not inspected by garbage collection, causing leaks of inflight sockets. This also breaks the Tarjan-based garbage collector's assumption that unix_edge.successor is always alive, resulting in a use-after-free vulnerability. Furthermore, SOCKMAP does not properly call scm_stat_del(), causing unix_show_fdinfo() to report incorrect file descriptor counts. The fix involves dropping all SCM attributes before skb is passed to the SOCKMAP layer.
Potential Impact
The vulnerability allows inflight file descriptors to be hidden from garbage collection, causing resource leaks and potential use-after-free conditions in the kernel. This can lead to system instability, denial of service, or privilege escalation due to corrupted kernel state. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability. However, exploitation requires local access with low privileges and no user interaction.
Mitigation Recommendations
An official patch is available and should be applied promptly. The vendor advisory from Ubuntu confirms that updating to the fixed Linux kernel versions resolves this issue. After updating, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigations are necessary beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53005
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro: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: 6a5a015891ae9bcd3f8025fe
Added to database: 07/17/2026, 10:18:00 UTC
Last enriched: 09/07/2026, 23:19:08 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 26
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