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CVE-2024-49850

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LO…

Published Oct 21, 2024CWE-476EPSS 0.21%

Overview

CVE-2024-49850 is a medium-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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: correctly handle malformed BPF_CORE_TYPE_ID_LOCAL relos

In case of malformed relocation record of kind BPF_CORE_TYPE_ID_LOCAL

referencing a non-existing BTF type, function bpf_core_calc_relo_insn

would cause a null pointer deference.

Fix this by adding a proper check upper in call stack, as malformed

relocation records could be passed from user space.

Simplest reproducer is a program:

r0 = 0

exit

With a single relocation record:

.insn_off = 0, /* patch first instruction */

.type_id = 100500, /* this type id does not exist */

.access_str_off = 6, /* offset of string "0" */

.kind = BPF_CORE_TYPE_ID_LOCAL,

See the link for original reproducer or next commit for a test case.

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/2288b54b96dcb55bedebcef3572bb8821fc5e708Refgit.kernel.org/stable/c/3d2786d65aaa954ebd3fcc033ada433e10da21c4Refgit.kernel.org/stable/c/584cd3ff792e1edbea20b2a7df55897159b0be3eRefgit.kernel.org/stable/c/dc7ce14f00bcd50641f2110b7a32aa6552e0780fRefgit.kernel.org/stable/c/e7e9c5b2dda29067332df2a85b0141a92b41f218Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49850?

CVE-2024-49850 is a medium-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-49850?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-49850?

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-2024-49850?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49850 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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