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CVE-2026-43070

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Reset register ID for BPF_END value tracking When a register undergoes a BPF_END (byte swap) operation, its scalar value i…

Published May 5, 2026CWE-125EPSS 0.17%

Overview

CVE-2026-43070 is a high-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

bpf: Reset register ID for BPF_END value tracking

When a register undergoes a BPF_END (byte swap) operation, its scalar

value is mutated in-place. If this register previously shared a scalar ID

with another register (e.g., after an `r1 = r0` assignment), this tie must

be broken.

Currently, the verifier misses resetting `dst_reg->id` to 0 for BPF_END.

Consequently, if a conditional jump checks the swapped register, the

verifier incorrectly propagates the learned bounds to the linked register,

leading to false confidence in the linked register's value and potentially

allowing out-of-bounds memory accesses.

Fix this by explicitly resetting `dst_reg->id` to 0 in the BPF_END case

to break the scalar tie, similar to how BPF_NEG handles it via

`__mark_reg_known`.

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/0d15c3611a2cc5d08993545d4032055ae10ae2c1Refgit.kernel.org/stable/c/a17443af874229408ce6b78e2c8a2b5adeb4b7d8Refgit.kernel.org/stable/c/a3125bc01884431d30d731461634c8295b6f0529

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43070?

CVE-2026-43070 is a high-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43070?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43070?

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-2026-43070?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43070 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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