CVE-2026-31612 ksmbd: validate EaNameLength in smb2_get_ea()

What is CVE-2026-31612?

CVE-2026-31612 is a high-severity vulnerability in Linux kernel, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Which versions are affected by CVE-2026-31612?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31612?

Apply the vendor's patch.

Is CVE-2026-31612 being exploited?

There is no known exploitation of CVE-2026-31612 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-83783, BELL-CVE-2026-31612, DEBIAN-CVE-2026-31612, GHSA-mgh3-34fv-3j84, ROOT-OS-DEBIAN-12-CVE-2026-31612, ROOT-OS-UBUNTU-2204-CVE-2026-31612 and 2 more.