Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-31577

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map The DAT inode's btree node cache (i_assoc_inode) is…

Published Apr 24, 2026CWE-476EPSS 0.17%

Overview

CVE-2026-31577 is a medium-severity vulnerability. It was published on April 24, 2026 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:

nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map

The DAT inode's btree node cache (i_assoc_inode) is initialized lazily

during btree operations. However, nilfs_mdt_save_to_shadow_map()

assumes i_assoc_inode is already initialized when copying dirty pages

to the shadow map during GC.

If NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before

any btree operation has occurred on the DAT inode, i_assoc_inode is

NULL leading to a general protection fault.

Fix this by calling nilfs_attach_btree_node_cache() on the DAT inode

in nilfs_dat_read() at mount time, ensuring i_assoc_inode is always

initialized before any GC operation can use it.

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/41de342278ae025c99cc8d33648773f05e306cf1Refgit.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363Refgit.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48Refgit.kernel.org/stable/c/6637bbcfb59df5b732a79e5ab1a74886a0b93d59Refgit.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8Refgit.kernel.org/stable/c/7902b1df1520a0880bcda7a3704cfacd17905a83Refgit.kernel.org/stable/c/837c7a59fb58f81b0db33848357f6a5d0d1250adRefgit.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084Refgit.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31577?

CVE-2026-31577 is a medium-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31577?

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-2026-31577?

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-2026-31577?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31577 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.

Related MEDIUM CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999