In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23058)
A memory leak vulnerability in the Linux kernel's CAN network layer driver ems_usb was fixed. The issue involved USB Request Blocks (URBs) not being properly anchored and released, causing a memory leak. This flaw was addressed by anchoring the URBs correctly in the ems_usb_read_bulk_callback() function. The vulnerability affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates fixing this and other kernel vulnerabilities, requiring a system reboot and recompilation of third-party kernel modules due to ABI changes.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's ems_usb driver (CAN network layer) was caused by improper handling of USB Request Blocks (URBs) in the ems_usb_read_bulk_callback() function. Specifically, URBs were unanchored by the USB framework before the callback was called, leading to them not being freed in ems_usb_close(), resulting in a memory leak. The fix involves anchoring the URBs again within the callback to ensure proper release. This issue is similar to a previously fixed memory leak in the gs_usb driver. The vulnerability affects Linux kernel versions prior to the patched releases listed in the Ubuntu advisories. Multiple Linux kernel subsystems were updated in the related Ubuntu security notices, and the fixes require rebooting and recompiling kernel modules due to ABI changes.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's ems_usb driver, which could lead to resource exhaustion over time. While the impact is limited to memory management, such leaks can degrade system stability and performance. The Ubuntu advisory notes that attackers could potentially exploit kernel vulnerabilities to compromise the system, but no specific exploit or active exploitation is reported for this issue. The severity is assessed as medium.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should apply the official updates for their respective Ubuntu releases (20.04 LTS, 22.04 LTS, and others as listed) and reboot the system to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled after updating the kernel. Follow the vendor's update instructions precisely to ensure full remediation.
In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak Fix similar… (CVE-2026-23058)
Description
A memory leak vulnerability in the Linux kernel's CAN network layer driver ems_usb was fixed. The issue involved USB Request Blocks (URBs) not being properly anchored and released, causing a memory leak. This flaw was addressed by anchoring the URBs correctly in the ems_usb_read_bulk_callback() function. The vulnerability affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates fixing this and other kernel vulnerabilities, requiring a system reboot and recompilation of third-party kernel modules due to ABI changes.
Affected software
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protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/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]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg: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=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 ems_usb driver (CAN network layer) was caused by improper handling of USB Request Blocks (URBs) in the ems_usb_read_bulk_callback() function. Specifically, URBs were unanchored by the USB framework before the callback was called, leading to them not being freed in ems_usb_close(), resulting in a memory leak. The fix involves anchoring the URBs again within the callback to ensure proper release. This issue is similar to a previously fixed memory leak in the gs_usb driver. The vulnerability affects Linux kernel versions prior to the patched releases listed in the Ubuntu advisories. Multiple Linux kernel subsystems were updated in the related Ubuntu security notices, and the fixes require rebooting and recompiling kernel modules due to ABI changes.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's ems_usb driver, which could lead to resource exhaustion over time. While the impact is limited to memory management, such leaks can degrade system stability and performance. The Ubuntu advisory notes that attackers could potentially exploit kernel vulnerabilities to compromise the system, but no specific exploit or active exploitation is reported for this issue. The severity is assessed as medium.
Mitigation Recommendations
A patch is available and included in updated Linux kernel packages distributed by Ubuntu. Users should apply the official updates for their respective Ubuntu releases (20.04 LTS, 22.04 LTS, and others as listed) and reboot the system to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled after updating the kernel. Follow the vendor's update instructions precisely to ensure full remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23058
- 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"]
Threat ID: 6a5b63612d1edb114c8b35b3
Added to database: 07/18/2026, 11:28:33 UTC
Last enriched: 08/22/2026, 21:31:26 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 6
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