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CVE-2026-23147

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: zlib: fix the folio leak on S390 hardware acceleration [BUG] After commit aa60fe12b4f4 ("btrfs: zlib: refactor S390x HW…

Published Feb 14, 2026CWE-401EPSS 0.13%

Overview

CVE-2026-23147 is a medium-severity vulnerability. It was published on February 14, 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:

btrfs: zlib: fix the folio leak on S390 hardware acceleration

[BUG]

After commit aa60fe12b4f4 ("btrfs: zlib: refactor S390x HW acceleration

buffer preparation"), we no longer release the folio of the page cache

of folio returned by btrfs_compress_filemap_get_folio() for S390

hardware acceleration path.

[CAUSE]

Before that commit, we call kumap_local() and folio_put() after handling

each folio.

Although the timing is not ideal (it release previous folio at the

beginning of the loop, and rely on some extra cleanup out of the loop),

it at least handles the folio release correctly.

Meanwhile the refactored code is easier to read, it lacks the call to

release the filemap folio.

[FIX]

Add the missing folio_put() for copy_data_into_buffer().

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/0d0f1314e8f86f5205f71f9e31e272a1d008e40bRefgit.kernel.org/stable/c/e80617a5e1c246da2f112a1a072cdd535046adfe

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23147?

CVE-2026-23147 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23147?

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-2026-23147?

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-2026-23147?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23147 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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