Linux Kernel up to 6.11.4 entry_32 buffer overflow

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.11.4. Affected by this vulnerability is an unknown functionality of the component entry_32. This manipulation causes buffer overflow. This vulnerability is registered as CVE-2024-50193. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.11.4. It has been declared as critical. Affected by this vulnerability is an unknown code of the component entry_32. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: x86/entry_32: Clear CPU buffers after register restore in NMI return CPU buffers are currently cleared after call to exc_nmi, but before register state is restored. This may be okay for MDS mitigation but not for RDFS. Because RDFS mitigation requires CPU buffers to be cleared when registers don't have any sensitive data. Move CLEAR_CPU_BUFFERS after RESTORE_ALL_NMI.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2024-50193 since 10/21/2024. The exploitation appears to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/14/2024).

The vulnerability scanner Nessus provides a plugin with the ID 212813 (CBL Mariner 2.0 Security Update: kernel (CVE-2024-50193)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.228, 5.15.169, 6.1.114, 6.6.58, 6.8 or 6.11.5 eliminates this vulnerability. Applying the patch 6f44a5fc15b5/b6400eb0b347/43778de19d2e/227358e89703/64adf22c4bc7/48a2440d0f20 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 Tenable (212813). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.227
• 5.15.168
• 6.0
• 6.1
• 6.1.113
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.6.35
• 6.6.36
• 6.6.37
• 6.6.38
• 6.6.39
• 6.6.40
• 6.6.41
• 6.6.42
• 6.6.43
• 6.6.44
• 6.6.45
• 6.6.46
• 6.6.47
• 6.6.48
• 6.6.49
• 6.6.50
• 6.6.51
• 6.6.52
• 6.6.53
• 6.6.54
• 6.6.55
• 6.6.56
• 6.6.57
• 6.7
• 6.8
• 6.11.0
• 6.11.1
• 6.11.2
• 6.11.3
• 6.11.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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