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CVE-2021-47317

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: powerpc/bpf: Fix detecting BPF atomic instructions Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode other ato…

Published May 21, 2024CWE-667EPSS 0.19%

Overview

CVE-2021-47317 is a high-severity vulnerability. It was published on May 21, 2024 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:

powerpc/bpf: Fix detecting BPF atomic instructions

Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode other

atomics in .imm") converted BPF_XADD to BPF_ATOMIC and added a way to

distinguish instructions based on the immediate field. Existing JIT

implementations were updated to check for the immediate field and to

reject programs utilizing anything more than BPF_ADD (such as BPF_FETCH)

in the immediate field.

However, the check added to powerpc64 JIT did not look at the correct

BPF instruction. Due to this, such programs would be accepted and

incorrectly JIT'ed resulting in soft lockups, as seen with the atomic

bounds test. Fix this by looking at the correct immediate value.

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/0d435b6d94b05dcfd836d758a63145aa566618e2Refgit.kernel.org/stable/c/419ac821766cbdb9fd85872bb3f1a589df05c94cRefgit.kernel.org/stable/c/7284dab07e4d51d453cc42851fae9ec4fac6ef2fRefgit.kernel.org/stable/c/0d435b6d94b05dcfd836d758a63145aa566618e2Refgit.kernel.org/stable/c/419ac821766cbdb9fd85872bb3f1a589df05c94cRefgit.kernel.org/stable/c/7284dab07e4d51d453cc42851fae9ec4fac6ef2f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47317?

CVE-2021-47317 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47317?

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-2021-47317?

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-2021-47317?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47317 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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