Linux Kernel up to 6.12.7 bpf_get_smp_processor_id memory corruption

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.7. It has been rated as critical. The impacted element is the function bpf_get_smp_processor_id. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2024-56768. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.12.7. This issue affects the function bpf_get_smp_processor_id. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_get_smp_processor_id() on !CONFIG_SMP On x86-64 calling bpf_get_smp_processor_id() in a kernel with CONFIG_SMP disabled can trigger the following bug, as pcpu_hot is unavailable: [ 8.471774] BUG: unable to handle page fault for address: 00000000936a290c [ 8.471849] #PF: supervisor read access in kernel mode [ 8.471881] #PF: error_code(0x0000) - not-present page Fix by inlining a return 0 in the !CONFIG_SMP case.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2024-56768 since 12/29/2024. The exploitation is known 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 10/13/2025).

The vulnerability scanner Nessus provides a plugin with the ID 231832 (Linux Distros Unpatched Vulnerability : CVE-2024-56768), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.8 eliminates this vulnerability. Applying the patch f4ab7d74247b0150547cf909b3f6f24ee85183df/23579010cf0a12476e96a5f1acdf78a9c5843657 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 (231832) and CERT Bund (WID-SEC-2025-0016). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Debian Linux
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Dell NetWorker
• Dell Avamar
• Dell PowerProtect Data Domain
• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4
• 6.12.5
• 6.12.6
• 6.12.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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