In the Linux kernel, the following vulnerability has been resolved: can: esd_usb: esd_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23075)
A memory leak vulnerability in the Linux kernel's esd_usb driver (CVE-2026-23075) has been fixed. The issue involves URBs (USB Request Blocks) used for USB-in transfers that are not properly anchored after completion, causing them to not be released and resulting in a memory leak. This was addressed by anchoring the URB in the callback function to ensure proper cleanup. The vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability due to the memory leak. No known exploits are reported in the wild.
AI Analysis
Technical Summary
The Linux kernel's esd_usb driver suffered from a memory leak vulnerability (CVE-2026-23075) caused by USB Request Blocks (URBs) not being properly anchored after completion in the esd_usb_read_bulk_callback() function. Although URBs are allocated and anchored on submission, the USB framework unanchors them before the completion callback is invoked, leading to URBs not being freed in esd_usb_close(). The fix involves re-anchoring the URB within the completion callback to ensure proper release and prevent memory leaks. This vulnerability affects multiple Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and related builds. Ubuntu has released patches for affected kernel packages, and users are advised to update and reboot to apply the fix. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, low privileges required, no user interaction, and impacts availability only. No active exploitation has been reported.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's esd_usb driver, which can degrade system availability or stability over time due to unreleased USB Request Blocks (URBs). There is no impact on confidentiality or integrity. The attack requires local privileges and low complexity. No known exploits are currently in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu for affected Linux kernel versions. Users should update their systems to the fixed kernel versions listed in the vendor advisories and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the official Ubuntu security notices USN-8162-1 and USN-8180-1 for detailed update instructions. No additional mitigations are necessary once the update is applied.
In the Linux kernel, the following vulnerability has been resolved: can: esd_usb: esd_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23075)
Description
A memory leak vulnerability in the Linux kernel's esd_usb driver (CVE-2026-23075) has been fixed. The issue involves URBs (USB Request Blocks) used for USB-in transfers that are not properly anchored after completion, causing them to not be released and resulting in a memory leak. This was addressed by anchoring the URB in the callback function to ensure proper cleanup. The vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability due to the memory leak. No known exploits are reported in the wild.
CVSS v3.1
Score 5.5medium
Affected software
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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=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
The Linux kernel's esd_usb driver suffered from a memory leak vulnerability (CVE-2026-23075) caused by USB Request Blocks (URBs) not being properly anchored after completion in the esd_usb_read_bulk_callback() function. Although URBs are allocated and anchored on submission, the USB framework unanchors them before the completion callback is invoked, leading to URBs not being freed in esd_usb_close(). The fix involves re-anchoring the URB within the completion callback to ensure proper release and prevent memory leaks. This vulnerability affects multiple Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and related builds. Ubuntu has released patches for affected kernel packages, and users are advised to update and reboot to apply the fix. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, low privileges required, no user interaction, and impacts availability only. No active exploitation has been reported.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's esd_usb driver, which can degrade system availability or stability over time due to unreleased USB Request Blocks (URBs). There is no impact on confidentiality or integrity. The attack requires local privileges and low complexity. No known exploits are currently in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu for affected Linux kernel versions. Users should update their systems to the fixed kernel versions listed in the vendor advisories and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow the official Ubuntu security notices USN-8162-1 and USN-8180-1 for detailed update instructions. No additional mitigations are necessary once the update is applied.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23075
- 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
- 3.1
Threat ID: 6a5b634a2d1edb114c8b11e0
Added to database: 07/18/2026, 11:28:10 UTC
Last enriched: 08/22/2026, 21:27:10 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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