# CVE-2026-31409: linux: In the Linux kernel, the following vulnerability has been resolved:  ksmbd: unset conn->binding on failed binding req...

CVE-2026-31409 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-31409, released April 6, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-31409
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 6, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: unset conn->binding on failed binding request  When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.170-1 | [DEBIAN-CVE-2026-31409](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31409.md) | Apr 6, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-31409](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31409.md) | Apr 6, 2026 |
| Linux | linux Debian 14 | 6.19.10-1 | [DEBIAN-CVE-2026-31409](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31409.md) | Apr 6, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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