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CVE-2026-53303

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count an…

Published Jun 26, 2026CWE-125EPSS 0.17%

Overview

CVE-2026-53303 is a high-severity vulnerability. It was published on June 26, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

In f2fs_sbi_show(), the extension_list, extension_count and

hot_ext_count are read without holding sbi->sb_lock. If a concurrent

sysfs store modifies the extension list via f2fs_update_extension_list(),

the show path may read inconsistent count and array contents, potentially

leading to out-of-bounds access or displaying stale data.

Fix this by holding sb_lock around the entire extension list read

and format operation.

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/4b3a1bf4c2ffd4c9595d900ead78c9035894a025Refgit.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194Refgit.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4ebRefgit.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428Refgit.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647Refgit.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53303?

CVE-2026-53303 is a high-severity vulnerability. It was published on June 26, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-53303?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-53303?

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-2026-53303?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53303 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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