Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - Fix OOM ->tfm_count leak If memory allocation fails,… (CVE-2026-31391)
In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - Fix OOM ->tfm_count leak If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.
AI Analysis
Technical Summary
The Linux kernel's atmel-sha204a cryptographic driver had a flaw where, if a memory allocation failed (out-of-memory condition), the internal reference count (->tfm_count) was not decremented properly. This could cause a resource leak that blocks future cryptographic read operations, impacting system availability. The vulnerability is tracked as CVE-2026-31391 and affects the linux-hwe-edge kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The issue has been resolved by correcting the reference count decrement on allocation failure. The fix is included in official Ubuntu kernel updates. The advisory also references numerous other Linux kernel vulnerabilities fixed in the same update cycle.
Potential Impact
This vulnerability impacts system availability by causing a resource leak in the cryptographic driver, potentially blocking future cryptographic operations. There is no impact on confidentiality or integrity. The CVSS 3.1 vector indicates local attack vector with low complexity and low privileges required, no user interaction, and unchanged scope. No known exploits in the wild have been reported.
Mitigation Recommendations
An official patch is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later for the linux-hwe-edge package. Users should update their systems to these versions or later and reboot to apply the fix. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules may be required. Follow vendor instructions for updating and rebooting. No additional mitigations are specified or required.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - Fix OOM ->tfm_count leak If memory allocation fails,… (CVE-2026-31391)
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: atmel-sha204a - Fix OOM ->tfm_count leak If memory allocation fails, decrement ->tfm_count to avoid blocking future reads.
CVSS v3.1
Score 5.5medium
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?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]?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]?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=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 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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=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's atmel-sha204a cryptographic driver had a flaw where, if a memory allocation failed (out-of-memory condition), the internal reference count (->tfm_count) was not decremented properly. This could cause a resource leak that blocks future cryptographic read operations, impacting system availability. The vulnerability is tracked as CVE-2026-31391 and affects the linux-hwe-edge kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The issue has been resolved by correcting the reference count decrement on allocation failure. The fix is included in official Ubuntu kernel updates. The advisory also references numerous other Linux kernel vulnerabilities fixed in the same update cycle.
Potential Impact
This vulnerability impacts system availability by causing a resource leak in the cryptographic driver, potentially blocking future cryptographic operations. There is no impact on confidentiality or integrity. The CVSS 3.1 vector indicates local attack vector with low complexity and low privileges required, no user interaction, and unchanged scope. No known exploits in the wild have been reported.
Mitigation Recommendations
An official patch is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later for the linux-hwe-edge package. Users should update their systems to these versions or later and reboot to apply the fix. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules may be required. Follow vendor instructions for updating and rebooting. No additional mitigations are specified or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31391
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro: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: 6a5b62702d1edb114c88d914
Added to database: 07/18/2026, 11:24:32 UTC
Last enriched: 08/01/2026, 06:02:36 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 19
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