Linux Kernel up to 5.15.144/6.1.24/6.2.11 ksmbd decode_preauth_ctxt out-of-bounds

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 5.15.144/6.1.24/6.2.11. This issue affects the function decode_preauth_ctxt of the component ksmbd. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2023-54250. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.144/6.1.24/6.2.11. It has been classified as problematic. This affects the function decode_preauth_ctxt of the component ksmbd. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2023-54250 since 12/30/2025. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.15.145, 6.1.25 or 6.2.12 eliminates this vulnerability. Applying the patch 39f5b4b313b445c980a2a295bed28228c29228ed/a2f6ded41bec1d3be643c80a5eb97f1680309001/f02edb9debbd36f44efa7567031485892c7df60d/e7067a446264a7514fa1cfaa4052cdb6803bc6a2 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-2941). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• IBM Power Hardware Management Console
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Open Source Linux Kernel
• RESF Rocky Linux
• IBM DataPower Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.144
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.1.24
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.2.10
• 6.2.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

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