In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak Fix… (CVE-2026-23061)
A memory leak vulnerability in the Linux kernel's kvaser_usb driver was fixed. The issue involved URBs (USB Request Blocks) not being properly anchored after completion, causing them not to be freed and resulting in a memory leak. This vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. The flaw was addressed by properly anchoring URBs in the completion callback. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should update and reboot to apply the fix.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's kvaser_usb driver (CVE-2026-23061) is a memory leak caused by improper handling of USB Request Blocks (URBs). Specifically, URBs allocated for USB-in transfers are anchored and submitted, but once completed, the USB framework unanchors them before the completion callback is called. This leads to the URBs not being freed by usb_kill_anchored_urbs(), causing a memory leak. The fix involves re-anchoring the URBs in the completion callback to ensure proper cleanup. This issue affects Linux kernel versions prior to certain 5.15.0-xxx releases on Ubuntu 20.04 LTS and 22.04 LTS. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, requiring low privileges, no user interaction, and impacts availability only. Ubuntu has released patched kernel packages to address this and other kernel vulnerabilities, requiring system updates and reboots. Due to ABI changes, recompilation of third-party kernel modules may be necessary.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's USB driver for Kvaser devices, which can degrade system availability by exhausting memory resources over time. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity impact focused on availability. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of updated Linux kernel packages for affected versions. Users should apply the updates and reboot their systems to fully remediate the issue. Due to an ABI change in the kernel update, recompiling and reinstalling any third-party kernel modules is required. No additional mitigation steps are indicated by the vendor advisory.
In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak Fix… (CVE-2026-23061)
Description
A memory leak vulnerability in the Linux kernel's kvaser_usb driver was fixed. The issue involved URBs (USB Request Blocks) not being properly anchored after completion, causing them not to be freed and resulting in a memory leak. This vulnerability affects certain Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and similar versions. The flaw was addressed by properly anchoring URBs in the completion callback. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should update and reboot to apply the fix.
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 vulnerability in the Linux kernel's kvaser_usb driver (CVE-2026-23061) is a memory leak caused by improper handling of USB Request Blocks (URBs). Specifically, URBs allocated for USB-in transfers are anchored and submitted, but once completed, the USB framework unanchors them before the completion callback is called. This leads to the URBs not being freed by usb_kill_anchored_urbs(), causing a memory leak. The fix involves re-anchoring the URBs in the completion callback to ensure proper cleanup. This issue affects Linux kernel versions prior to certain 5.15.0-xxx releases on Ubuntu 20.04 LTS and 22.04 LTS. The vulnerability has a CVSS 3.1 base score of 5.5 (medium severity), with local attack vector, low complexity, requiring low privileges, no user interaction, and impacts availability only. Ubuntu has released patched kernel packages to address this and other kernel vulnerabilities, requiring system updates and reboots. Due to ABI changes, recompilation of third-party kernel modules may be necessary.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's USB driver for Kvaser devices, which can degrade system availability by exhausting memory resources over time. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity impact focused on availability. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu as part of updated Linux kernel packages for affected versions. Users should apply the updates and reboot their systems to fully remediate the issue. Due to an ABI change in the kernel update, recompiling and reinstalling any third-party kernel modules is required. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23061
- 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: 6a5b635c2d1edb114c8b31ab
Added to database: 07/18/2026, 11:28:28 UTC
Last enriched: 08/22/2026, 21:30:56 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 7
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