In the Linux kernel, the following vulnerability has been resolved: HID: apple: avoid memory leak in apple_report_fixup() The apple_report_fixup()… (CVE-2026-31520)
In the Linux kernel, the following vulnerability has been resolved: HID: apple: avoid memory leak in apple_report_fixup() The apple_report_fixup() function was returning a newly kmemdup()-allocated buffer, but never freeing it. The caller of report_fixup() does not take ownership of the returned pointer, but it *is* permitted to return a sub-portion of the input rdesc, whose lifetime is managed by the caller.
AI Analysis
Technical Summary
The Linux kernel contained a memory leak in the HID apple_report_fixup() function where a newly allocated buffer via kmemdup() was returned but never freed. The caller does not assume ownership of this buffer, which violates expected memory management and causes a leak. This flaw was fixed in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. The vulnerability is tracked as CVE-2026-31520 with a CVSS v3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating a local attacker with low privileges can cause a denial of service by exhausting memory. The vendor advisory from Ubuntu confirms the fix and recommends updating to patched kernel versions.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's HID subsystem, specifically in the apple_report_fixup() function. This can lead to resource exhaustion and potential denial of service (availability impact). There is no impact on confidentiality or integrity. The attack requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
An official patch is available and included in Linux kernel updates starting with version 6.8.0-1061.64~22.04.1 and related builds. Users should update their Linux kernel to the fixed versions as provided by their distribution vendor (e.g., Ubuntu security notices USN-8567-1 and USN-8574-1) and reboot the system to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are required beyond applying the official update.
In the Linux kernel, the following vulnerability has been resolved: HID: apple: avoid memory leak in apple_report_fixup() The apple_report_fixup()… (CVE-2026-31520)
Description
In the Linux kernel, the following vulnerability has been resolved: HID: apple: avoid memory leak in apple_report_fixup() The apple_report_fixup() function was returning a newly kmemdup()-allocated buffer, but never freeing it. The caller of report_fixup() does not take ownership of the returned pointer, but it *is* permitted to return a sub-portion of the input rdesc, whose lifetime is managed by the caller.
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 contained a memory leak in the HID apple_report_fixup() function where a newly allocated buffer via kmemdup() was returned but never freed. The caller does not assume ownership of this buffer, which violates expected memory management and causes a leak. This flaw was fixed in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. The vulnerability is tracked as CVE-2026-31520 with a CVSS v3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating a local attacker with low privileges can cause a denial of service by exhausting memory. The vendor advisory from Ubuntu confirms the fix and recommends updating to patched kernel versions.
Potential Impact
The vulnerability causes a memory leak in the Linux kernel's HID subsystem, specifically in the apple_report_fixup() function. This can lead to resource exhaustion and potential denial of service (availability impact). There is no impact on confidentiality or integrity. The attack requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
An official patch is available and included in Linux kernel updates starting with version 6.8.0-1061.64~22.04.1 and related builds. Users should update their Linux kernel to the fixed versions as provided by their distribution vendor (e.g., Ubuntu security notices USN-8567-1 and USN-8574-1) and reboot the system to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigation steps are required beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31520
- 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: 6a5b621b2d1edb114c889d99
Added to database: 07/18/2026, 11:23:07 UTC
Last enriched: 08/01/2026, 05:34:35 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 27
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