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CVE-2025-38549· NVD / CVE Program· CNA Linux

efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths When processing mount options, efivarfs allocates efivarfs_fs_info (sfi) early in fs_context initialization. However, sfi is associated with the superblock and typically freed when the superblock is destroyed. If the fs_context is released (final put) before fill_super is called—such as on error paths or during reconfiguration—the sfi structure would leak, as ownership never transfers to the superblock. Implement the .free callback in efivarfs_context_ops to ensure any allocated sfi is properly freed if the fs_context is torn down before fill_super, preventing this memory leak.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 16, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 3th percentile
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Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Affected systems

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.7 and later · before 6.12.40
  • linux linux kernel6.13 and later · before 6.15.8
  • linux linux kernel6.16

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.7affected
    • 5329aa5101f73c451bcd48deaf3f296685849d9c and later · before 816d36973467d1c9c08a48bdffe4675e219a2e84affected · git
    • 5329aa5101f73c451bcd48deaf3f296685849d9c and later · before e9fabe7036bb8be6071f39dc38605508f5f57b20affected · git
    • 5329aa5101f73c451bcd48deaf3f296685849d9c and later · before 64e135f1eaba0bbb0cdee859af3328c68d5b9789affected · git
    • before 6.7not affected · semver
    • 6.12.40 and later · up to and including 6.12.*not affected · semver
    • 6.15.8 and later · up to and including 6.15.*not affected · semver
    • 6.16 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.41-16.12.41-1
Debian:14linuxbefore 6.16.3-16.16.3-1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_16before 1-150700.15.3.21-150700.15.3.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_16before 1-150700.1.5.21-150700.1.5.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.60.1.150700.17.35.46.4.0-150700.53.60.1.150700.17.35.4
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-docsbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-obs-buildbefore 6.4.0-150700.53.60.26.4.0-150700.53.60.2
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-symsbefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7kernel-azurebefore 6.4.0-150700.53.60.16.4.0-150700.53.60.1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-47.16.4.0-47.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-47.1.21.246.4.0-47.1.21.24
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-47.16.4.0-47.1
SUSE:Linux Micro 6.0kernel-rtbefore 6.4.0-48.16.4.0-48.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-47.16.4.0-47.1
SUSE:Linux Micro 6.0kernel-source-rtbefore 6.4.0-48.16.4.0-48.1
SUSE:Real Time Module 15 SP7kernel-rtbefore 6.4.0-150700.7.59.26.4.0-150700.7.59.2
SUSE:Real Time Module 15 SP7kernel-source-rtbefore 6.4.0-150700.7.59.26.4.0-150700.7.59.2
SUSE:Real Time Module 15 SP7kernel-syms-rtbefore 6.4.0-150700.7.59.16.4.0-150700.7.59.1

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    83Now
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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux64e135f1eaba0bbb0cdee859af3328c68d5b9789Vendor (CNA)
Linux Linux816d36973467d1c9c08a48bdffe4675e219a2e84Vendor (CNA)
Linux Linuxe9fabe7036bb8be6071f39dc38605508f5f57b20Vendor (CNA)
debian:linux6.12.41-1 · Debian:13Package registry (OSV)
suse:kernel-64kb6.4.0-150700.53.60.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-47.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-47.1.21.24 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.60.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-kvmsmall6.4.0-47.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_161-150700.15.3.2 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.4.0-150700.53.60.2 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-rt6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-47.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-syms6.4.0-150700.53.60.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150700.53.60.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

All records