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CVE-2026-22991

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: libceph: make free_choose_arg_map() resilient to partial allocation free_choose_arg_map() may dereference a NULL pointer if its…

Published Jan 23, 2026CWE-476EPSS 0.44%

Overview

CVE-2026-22991 is a high-severity vulnerability. It was published on January 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

libceph: make free_choose_arg_map() resilient to partial allocation

free_choose_arg_map() may dereference a NULL pointer if its caller fails

after a partial allocation.

For example, in decode_choose_args(), if allocation of arg_map->args

fails, execution jumps to the fail label and free_choose_arg_map() is

called. Since arg_map->size is updated to a non-zero value before memory

allocation, free_choose_arg_map() will iterate over arg_map->args and

dereference a NULL pointer.

To prevent this potential NULL pointer dereference and make

free_choose_arg_map() more resilient, add checks for pointers before

iterating.

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/8081faaf089db5280c3be820948469f7c58ef8ddRefgit.kernel.org/stable/c/851241d3f78a5505224dc21c03d8692f530256b4Refgit.kernel.org/stable/c/9b3730dabcf3764bfe3ff07caf55e641a0b45234Refgit.kernel.org/stable/c/c4c2152a858c0ce4d2bff6ca8c1d5b0ef9f2cbdfRefgit.kernel.org/stable/c/e3fe30e57649c551757a02e1cad073c47e1e075eRefgit.kernel.org/stable/c/ec1850f663da64842614c86b20fe734be070c2baRefgit.kernel.org/stable/c/f21c3fdb96833aac2f533506899fe38c19cf49d5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-22991?

CVE-2026-22991 is a high-severity vulnerability. It was published on January 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-22991?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-22991?

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-2026-22991?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-22991 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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