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Linux Kernel CVE-2026-23147

MEDIUM
Memory Leak (CWE-401)
2026-02-14 416baaa9-dc9f-4396-8d5f-8c081fb06d67
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.5 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:03 vuln.today
CVE Published
Feb 14, 2026 - 16:15 nvd
MEDIUM 5.5

DescriptionCVE.org

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().

AnalysisAI

A memory leak in the Linux kernel's btrfs zlib compression module on S390 hardware-accelerated systems fails to properly release file cache pages, potentially leading to memory exhaustion and denial of service on affected systems. The vulnerability stems from missing cleanup code introduced during a refactoring of the S390x hardware acceleration buffer handling. Local attackers with access to the system could trigger the leak through repeated compression operations.

Technical ContextAI

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 idea

RemediationAI

Monitor vendor advisories for a patch.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-23147 vulnerability details – vuln.today

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