Linux Kernel up to 7.2.5 BPF check_ptr_to_btf_access privileges management

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been classified as very critical. This vulnerability affects the function check_ptr_to_btf_access of the component BPF. Performing a manipulation results in privileges management. This vulnerability was named CVE-2026-93144. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.5. This affects the function check_ptr_to_btf_access of the component BPF. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. 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: bpf: Reject writes through untrusted BTF pointers check_ptr_to_btf_access() lets program-type btf_struct_access callbacks validate writes before the default BTF access path rejects non-read accesses. That bypasses the read-only policy for untrusted BTF pointers created by helpers such as bpf_rdonly_cast(). Reject non-read accesses through PTR_UNTRUSTED BTF pointers at the common entry point, before the callback branch to handle all cases.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93144 since 09/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 19d5566b84ca1af0256d0d0003e1a081580c3ba3/ac65c710cc643cbc52b899627577357867249530 is able to eliminate this problem. 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

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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