What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-10-15

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.

Affected products

• Linux kernel: from 5.15 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1 — fixed in 6.12.83, 6.18.24, 6.19.14, 6.6.136, 7.0.1

How to fix

Upgrade to a fixed version: Linux kernel 6.12.83, 6.18.24, 6.19.14, 6.6.136. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/243b206bcb5a7137e8bddd57b2eec81e1ebd3859
• https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d
• https://git.kernel.org/stable/c/4b73376feecb3b61172fe5b4ff42bbbb8531669d
• https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b
• https://git.kernel.org/stable/c/66751841212c2cc196577453c37f7774ff363f02
• https://git.kernel.org/stable/c/859f11e1bc81a4d32bb3ceeae54bcd296ac675d3
• https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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