In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads… (CVE-2026-31612)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received. Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.
AI Analysis
Technical Summary
The Linux kernel's ksmbd subsystem had a vulnerability where smb2_get_ea() read the EaNameLength field from a client request and used it directly as the length parameter in a strncmp() comparison without validating that the length corresponded to the actual buffer size. This lack of validation allowed potential leakage of uninitialized heap memory to the client. The issue was fixed by adding proper checks to ensure the EaNameLength does not exceed the bounds of the input buffer before performing the comparison. The vulnerability is tracked as CVE-2026-31612 and affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The CVSS v3.1 score is 7.5 (High confidentiality impact, no integrity or availability impact). The vendor advisory from Ubuntu confirms that a patch is available and recommends updating to fixed kernel versions.
Potential Impact
An unauthenticated remote attacker could exploit this vulnerability to leak uninitialized heap memory contents from the kernel to the client. This results in a confidentiality breach, potentially exposing sensitive information. There is no impact on integrity or availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch addressing this vulnerability is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to the fixed versions as provided by their distribution vendor, such as the Ubuntu security notices USN-8488-1 and USN-8488-2. After updating, a system reboot is required to apply the kernel changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigations are indicated by the vendor advisory.
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads… (CVE-2026-31612)
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received. Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.
CVSS v3.1
Score 7.5high
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's ksmbd subsystem had a vulnerability where smb2_get_ea() read the EaNameLength field from a client request and used it directly as the length parameter in a strncmp() comparison without validating that the length corresponded to the actual buffer size. This lack of validation allowed potential leakage of uninitialized heap memory to the client. The issue was fixed by adding proper checks to ensure the EaNameLength does not exceed the bounds of the input buffer before performing the comparison. The vulnerability is tracked as CVE-2026-31612 and affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions listed. The CVSS v3.1 score is 7.5 (High confidentiality impact, no integrity or availability impact). The vendor advisory from Ubuntu confirms that a patch is available and recommends updating to fixed kernel versions.
Potential Impact
An unauthenticated remote attacker could exploit this vulnerability to leak uninitialized heap memory contents from the kernel to the client. This results in a confidentiality breach, potentially exposing sensitive information. There is no impact on integrity or availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch addressing this vulnerability is available and included in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should update their Linux kernel to the fixed versions as provided by their distribution vendor, such as the Ubuntu security notices USN-8488-1 and USN-8488-2. After updating, a system reboot is required to apply the kernel changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31612
- 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","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5b61d82d1edb114c88652a
Added to database: 07/18/2026, 11:22:00 UTC
Last enriched: 08/01/2026, 05:15:33 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 20
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