In the Linux kernel, the following vulnerability has been resolved: net: usb: pegasus: fix memory leak in update_eth_regs_async() When… (CVE-2026-23021)
A memory leak vulnerability in the Linux kernel's USB Pegasus network driver (update_eth_regs_async function) was identified and fixed. The issue occurs when usb_submit_urb() fails during asynchronous register writes, causing allocated resources not to be released. This flaw could lead to denial of service by exhausting system memory. The vulnerability has a medium severity with a CVSS score of 5.5. Multiple Linux kernel versions prior to specific 5.15.x updates are affected. Ubuntu has released patches addressing this and other kernel vulnerabilities, requiring system updates and reboots to apply fixes.
AI Analysis
Technical Summary
CVE-2026-23021 is a memory leak vulnerability in the Linux kernel's net: usb: pegasus driver, specifically in the update_eth_regs_async() function. When usb_submit_urb() fails during asynchronous writes to device registers, the code fails to release allocated resources, causing a memory leak. This vulnerability affects multiple Linux kernel versions prior to certain 5.15.x updates. The issue was discovered and fixed as part of a broader set of Linux kernel security updates released by Ubuntu. The fix requires updating to patched kernel versions and rebooting the system. 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, unchanged scope, no confidentiality or integrity impact, but with availability impact.
Potential Impact
The vulnerability can cause a denial of service condition by leaking memory when usb_submit_urb() fails during asynchronous register writes in the Pegasus USB network driver. This could degrade system stability or availability. There is no direct confidentiality or integrity impact reported. The attack requires local privileges and low complexity, with no user interaction needed.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions as provided by the vendor (Ubuntu). After applying the update, a system reboot is required to complete remediation. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor advisory instructions for updating to the appropriate patched kernel package versions. No additional mitigation is indicated beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: net: usb: pegasus: fix memory leak in update_eth_regs_async() When… (CVE-2026-23021)
Description
A memory leak vulnerability in the Linux kernel's USB Pegasus network driver (update_eth_regs_async function) was identified and fixed. The issue occurs when usb_submit_urb() fails during asynchronous register writes, causing allocated resources not to be released. This flaw could lead to denial of service by exhausting system memory. The vulnerability has a medium severity with a CVSS score of 5.5. Multiple Linux kernel versions prior to specific 5.15.x updates are affected. Ubuntu has released patches addressing this and other kernel vulnerabilities, requiring system updates and reboots to apply fixes.
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
CVE-2026-23021 is a memory leak vulnerability in the Linux kernel's net: usb: pegasus driver, specifically in the update_eth_regs_async() function. When usb_submit_urb() fails during asynchronous writes to device registers, the code fails to release allocated resources, causing a memory leak. This vulnerability affects multiple Linux kernel versions prior to certain 5.15.x updates. The issue was discovered and fixed as part of a broader set of Linux kernel security updates released by Ubuntu. The fix requires updating to patched kernel versions and rebooting the system. 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, unchanged scope, no confidentiality or integrity impact, but with availability impact.
Potential Impact
The vulnerability can cause a denial of service condition by leaking memory when usb_submit_urb() fails during asynchronous register writes in the Pegasus USB network driver. This could degrade system stability or availability. There is no direct confidentiality or integrity impact reported. The attack requires local privileges and low complexity, with no user interaction needed.
Mitigation Recommendations
A patch is available and should be applied by updating the Linux kernel to the fixed versions as provided by the vendor (Ubuntu). After applying the update, a system reboot is required to complete remediation. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor advisory instructions for updating to the appropriate patched kernel package versions. No additional mitigation is indicated beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23021
- 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: 6a5b63682d1edb114c8b4063
Added to database: 07/18/2026, 11:28:40 UTC
Last enriched: 08/22/2026, 21:40:33 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 6
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