# CVE-2023-54250: linux: In the Linux kernel, the following vulnerability has been resolved:  ksmbd: avoid out of bounds access in decode_prea...

CVE-2023-54250 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-54250, released December 30, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-54250
- Priority: High
- CVSS: 8.2 (high)
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 30, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: avoid out of bounds access in decode_preauth_ctxt()  Confirm that the accessed pneg_ctxt->HashAlgorithms address sits within the SMB request boundary; deassemble_neg_contexts() only checks that the eight byte smb2_neg_context header + (client controlled) DataLength are within the packet boundary, which is insufficient.  Checking for sizeof(struct smb2_preauth_neg_context) is overkill given that the type currently assumes SMB311_SALT_SIZE bytes of trailing Salt.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.25-1 | [DEBIAN-CVE-2023-54250](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54250.md) | Dec 30, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.25-1 | [DEBIAN-CVE-2023-54250](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54250.md) | Dec 30, 2025 |
| Linux | linux Debian 14 | 6.1.25-1 | [DEBIAN-CVE-2023-54250](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54250.md) | Dec 30, 2025 |

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