Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()… (CVE-2026-53357)
A use-after-free vulnerability in the Linux kernel's Bluetooth subsystem (CVE-2026-53357) has been resolved. The flaw involves improper handling of socket cleanup in the l2cap_sock_cleanup_listen() function concurrent with connection deletion, leading to use-after-free conditions. This vulnerability has a high severity with a CVSS score of 8.0 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. Ubuntu has released patches addressing this and other kernel vulnerabilities, requiring system updates and reboots.
AI Analysis
Technical Summary
CVE-2026-53357 is a use-after-free vulnerability in the Linux kernel Bluetooth subsystem. The issue arises when bt_accept_dequeue() unlinks a not-yet-accepted child socket from the parent accept queue and releases it before returning, leaving the socket unlocked and without a caller reference. Concurrently, an HCI disconnect triggers l2cap_conn_del(), which frees the child socket and its associated channel. Subsequently, l2cap_sock_cleanup_listen() accesses these freed objects, causing a use-after-free error detected by KASAN. This vulnerability is distinct from previous fixes in the same area and affects multiple Linux kernel versions. Ubuntu has issued security advisories (USN-8566-1 and USN-8568-1) that include patches for this and other kernel vulnerabilities.
Potential Impact
Exploitation of this use-after-free vulnerability could lead to system instability or potential privilege escalation due to improper memory handling in the Bluetooth subsystem. The CVSS score of 8.0 indicates high impact on confidentiality, integrity, and availability. 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 their Linux kernel updates. Users should apply the relevant kernel updates for their distributions as listed in the Ubuntu advisories USN-8566-1 and USN-8568-1 and reboot their systems to complete the installation. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation actions are required beyond applying the official fixes.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()… (CVE-2026-53357)
Description
A use-after-free vulnerability in the Linux kernel's Bluetooth subsystem (CVE-2026-53357) has been resolved. The flaw involves improper handling of socket cleanup in the l2cap_sock_cleanup_listen() function concurrent with connection deletion, leading to use-after-free conditions. This vulnerability has a high severity with a CVSS score of 8.0 and affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. Ubuntu has released patches addressing this and other kernel vulnerabilities, requiring system updates and reboots.
CVSS v3.1
Score 8.0high
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
CVE-2026-53357 is a use-after-free vulnerability in the Linux kernel Bluetooth subsystem. The issue arises when bt_accept_dequeue() unlinks a not-yet-accepted child socket from the parent accept queue and releases it before returning, leaving the socket unlocked and without a caller reference. Concurrently, an HCI disconnect triggers l2cap_conn_del(), which frees the child socket and its associated channel. Subsequently, l2cap_sock_cleanup_listen() accesses these freed objects, causing a use-after-free error detected by KASAN. This vulnerability is distinct from previous fixes in the same area and affects multiple Linux kernel versions. Ubuntu has issued security advisories (USN-8566-1 and USN-8568-1) that include patches for this and other kernel vulnerabilities.
Potential Impact
Exploitation of this use-after-free vulnerability could lead to system instability or potential privilege escalation due to improper memory handling in the Bluetooth subsystem. The CVSS score of 8.0 indicates high impact on confidentiality, integrity, and availability. 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 their Linux kernel updates. Users should apply the relevant kernel updates for their distributions as listed in the Ubuntu advisories USN-8566-1 and USN-8568-1 and reboot their systems to complete the installation. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation actions are required beyond applying the official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53357
- 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"]
Threat ID: 6a5a00a891ae9bcd3f7ef283
Added to database: 07/17/2026, 10:15:04 UTC
Last enriched: 09/07/2026, 21:17:20 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 24
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