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NVD / CVE Program· CNA Linux

CVE-2025-40055: ocfs2: fix double free in user_cluster_connect()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 283333079d96c84baa91f0c62b5e0cbec246b7a2, 694d5b401036a614f8080085a9de6f86ff0742dc, 7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2.

Low priority for now. Upgrade to Linux Linux 283333079d96c84baa91f0c62b5e0cbec246b7a2, 694d5b401036a614f8080085a9de6f86ff0742dc, 7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix double free in user_cluster_connect() user_cluster_disconnect() frees "conn->cc_private" which is "lc" but then the error handling frees "lc" a second time. Set "lc" to NULL on this path to avoid a double free.

—No exploit Fix available
Published
Oct 28, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 13th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

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

    • 3.14affected
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 283333079d96c84baa91f0c62b5e0cbec246b7a2affected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before f992bc72f681c32a682d474a29c2135a64d4f4e5affected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 827c8efa0d1afe817b90f3618afff552e88348d2affected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before bfe011297ddd2d0cd64752978baaa0c04cd20573affected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2affected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 694d5b401036a614f8080085a9de6f86ff0742dcaffected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 892f41e12c8689130d552a9eb2b77bafd26484abaffected · git
    • c994c2ebdbbc391a42f177c8eb7882ebf3f142d8 and later · before 8f45f089337d924db24397f55697cda0e6960516affected · git
    • before 3.14not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.81.16.4.0-150600.23.81.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.58.16.4.0-150600.8.58.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.81.3.150600.12.36.36.4.0-150600.23.81.3.150600.12.36.3
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.81.16.4.0-150600.23.81.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.81.16.4.0-150600.23.81.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.61.16.4.0-150600.10.61.1
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.61.16.4.0-150600.10.61.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.81.26.4.0-150600.23.81.2
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.58.16.4.0-150600.8.58.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.61.16.4.0-150600.10.61.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.81.16.4.0-150600.23.81.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.58.16.4.0-150600.8.58.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.61.16.4.0-150600.10.61.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.81.36.4.0-150600.23.81.3
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6_Update_18before 1-150600.13.3.31-150600.13.3.3
SUSE:Linux Enterprise Live Patching 15 SP6kernel-livepatch-SLE15-SP6-RT_Update_18before 1-150600.1.3.11-150600.1.3.1

+21

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40053Oct 28, 2025 · net: dlink: handle copy_thresh allocation failure
    30Monitor
  • ← EarlierCVE-2025-40054Oct 28, 2025 · f2fs: fix UAF issue in f2fs_merge_page_bio()
    31Monitor
  • Later →CVE-2025-40056Oct 28, 2025 · vhost: vringh: Fix copy_to_iter return value check
    0Monitor

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 Linux283333079d96c84baa91f0c62b5e0cbec246b7a2Vendor (CNA)
Linux Linux694d5b401036a614f8080085a9de6f86ff0742dcVendor (CNA)
Linux Linux7e76fe9dfadbc00364d7523d5a109e9d3e4a7db2Vendor (CNA)
Linux Linux827c8efa0d1afe817b90f3618afff552e88348d2Vendor (CNA)
Linux Linux892f41e12c8689130d552a9eb2b77bafd26484abVendor (CNA)
Linux Linux8f45f089337d924db24397f55697cda0e6960516Vendor (CNA)
Linux Linuxbfe011297ddd2d0cd64752978baaa0c04cd20573Vendor (CNA)
Linux Linuxf992bc72f681c32a682d474a29c2135a64d4f4e5Vendor (CNA)
debian:linux6.1.158-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.81.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.81.3.150600.12.36.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.81.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.81.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.81.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.81.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.81.3 · openSUSE:Leap 15.6Package registry (OSV)
suse:kernel-64kb6.4.0-150600.23.81.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-azure6.4.0-150600.8.58.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)
suse:kernel-default6.4.0-150600.23.81.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-default-base6.4.0-150600.23.81.3.150600.12.36.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-docs6.4.0-150600.23.81.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-livepatch-SLE15-SP6_Update_181-150600.13.3.3 · SUSE:Linux Enterprise Live Patching 15 SP6Package registry (OSV)
suse:kernel-obs-build6.4.0-150600.23.81.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP6Package registry (OSV)
suse:kernel-source6.4.0-150600.23.81.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:kernel-source-azure6.4.0-150600.8.58.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP6Package registry (OSV)

+3

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.

No history yet (it accumulates with the daily EPSS job).

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.

Credits

All researchers

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records