Linux Kernel up to 5.15.134/6.1.56/6.5.6 ksmbd smb20_oplock_break_ack use after free

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 5.15.134/6.1.56/6.5.6. Affected by this vulnerability is the function smb20_oplock_break_ack of the component ksmbd. The manipulation results in use after free. This vulnerability is reported as CVE-2023-52479. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.15.134/6.1.56/6.5.6 (Operating System). Affected is the function smb20_oplock_break_ack of the component ksmbd. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix uaf in smb20_oplock_break_ack drop reference after use opinfo.

The weakness was disclosed 02/29/2024. The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2023-52479 since 02/20/2024. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/05/2024).

Upgrading to version 5.15.135, 6.1.57, 6.5.7 or 6.6 eliminates this vulnerability. Applying the patch 694e13732e83/8226ffc759ea/d5b0e9d3563e/c69813471a1e 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.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.134
• 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
• 6.1.25
• 6.1.26
• 6.1.27
• 6.1.28
• 6.1.29
• 6.1.30
• 6.1.31
• 6.1.32
• 6.1.33
• 6.1.34
• 6.1.35
• 6.1.36
• 6.1.37
• 6.1.38
• 6.1.39
• 6.1.40
• 6.1.41
• 6.1.42
• 6.1.43
• 6.1.44
• 6.1.45
• 6.1.46
• 6.1.47
• 6.1.48
• 6.1.49
• 6.1.50
• 6.1.51
• 6.1.52
• 6.1.53
• 6.1.54
• 6.1.55
• 6.1.56
• 6.5.0
• 6.5.1
• 6.5.2
• 6.5.3
• 6.5.4
• 6.5.5
• 6.5.6

License

• open-source

Website

• Vendor: https://www.kernel.org/

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