PT-2026-8142 · Zlib+4 · Zlib+4

Published 2026-01-01 · Updated 2026-02-14 · CVE-2026-23147

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel's btrfs zlib implementation related to S390 hardware acceleration. Specifically, a folio leak occurs due to a missing folio put() call within the copy data into buffer() function after the refactoring of the S390x hardware acceleration buffer preparation. This issue arises from the removal of a folio release mechanism present in earlier code, leading to a memory leak when handling folios in the hardware acceleration path. The root cause is the absence of a call to release the filemap folio.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

CVE-2026-23147

Affected Products

Linux Kernel

S390

S390X

Btrfs

Zlib

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23147.json · Exploit
• https://ubuntu.com/security/CVE-2026-23147 · Vendor Advisory
• https://git.kernel.org/stable/c/0d0f1314e8f86f5205f71f9e31e272a1d008e40b · Patch
• https://git.kernel.org/stable/c/e80617a5e1c246da2f112a1a072cdd535046adfe · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-23147 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23147 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23147 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23147 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-23147 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23147 · Security Note
• https://twitter.com/CVEnew/status/2022708987783794941 · Twitter Post
• https://git.kernel.org/linus/0d0f1314e8f86f5205f71f9e31e272a1d008e40b · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note