Linux Kernel up to 6.12.3 arch_stack_walk_user_common memory corruption

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.12.3. Affected by this issue is the function arch_stack_walk_user_common. Performing a manipulation results in memory corruption. This vulnerability is identified as CVE-2024-56550. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.12.3. This affects the function arch_stack_walk_user_common. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: s390/stacktrace: Use break instead of return statement arch_stack_walk_user_common() contains a return statement instead of a break statement in case store_ip() fails while trying to store a callchain entry of a user space process. This may lead to a missing pagefault_enable() call. If this happens any subsequent page fault of the process won't be resolved by the page fault handler and this in turn will lead to the process being killed. Use a break instead of a return statement to fix this.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2024-56550 since 12/27/2024. The exploitability is told to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/23/2025).

The vulnerability scanner Nessus provides a plugin with the ID 230813 (Linux Distros Unpatched Vulnerability : CVE-2024-56550), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.4 eliminates this vulnerability. Applying the patch 20c26357826457dc7c8145297e60ddc012e18914/588a9836a4ef7ec3bfcffda526dfa399637e6cfc 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 databases at Tenable (230813) and CERT Bund (WID-SEC-2024-3762). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• RESF Rocky Linux
• Dell NetWorker
• Dell Avamar
• Red Hat OpenShift
• IBM QRadar SIEM
• Dell PowerProtect Data Domain
• Open Source Linux Kernel
• IBM DataPower Gateway
• Dell Secure Connect Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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