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CVE-2026-72426

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Preserve pointer spill metadata during half-slot cleanup __clean_func_state() cleans dead stack slots in 4-byte halves.

Published Aug 15, 2026EPSS 0.18%

Overview

CVE-2026-72426 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Preserve pointer spill metadata during half-slot cleanup

__clean_func_state() cleans dead stack slots in 4-byte halves. When the

high half of a STACK_SPILL slot is dead and the low half remains live,

cleanup converts the live low half to STACK_MISC or STACK_ZERO and clears

the saved spilled_ptr metadata.

That conversion is safe only for scalar spills. For a pointer spill, this

metadata clear lets a later 32-bit fill from the still-live half avoid the

normal non-scalar register-fill check and be treated as an ordinary scalar

stack read.

Leave non-scalar spill slots intact in this half-live shape. This is

conservative for pruning and preserves the existing

check_stack_read_fixed_off() rejection path for partial fills from pointer

spills.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0f9278b22cda6fd2525049930157b79b4036b4efRefgit.kernel.org/stable/c/3a354149bceacadbcf7d7b4766f5ef26a85892ab

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72426?

CVE-2026-72426 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-72426?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72426?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72426?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72426 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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