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NVD / CVE Program· CNA Linux

CVE-2025-40231: vsock: fix lock inversion in vsock_assign_transport()

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 09bba278ccde25a14b6e5088a9e65a8717d0cccf, 251caee792a21eb0b781aab91362b422c945e162, 42ed0784d11adebf748711e503af0eb9f1e6d81d.

Low priority for now. Upgrade to Linux Linux 09bba278ccde25a14b6e5088a9e65a8717d0cccf, 251caee792a21eb0b781aab91362b422c945e162, 42ed0784d11adebf748711e503af0eb9f1e6d81d 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: vsock: fix lock inversion in vsock_assign_transport() Syzbot reported a potential lock inversion deadlock between vsock_register_mutex and sk_lock-AF_VSOCK when vsock_linger() is called. The issue was introduced by commit 687aa0c5581b ("vsock: Fix transport_* TOCTOU") which added vsock_register_mutex locking in vsock_assign_transport() around the transport->release() call, that can call vsock_linger(). vsock_assign_transport() can be called with sk_lock held. vsock_linger() calls sk_wait_event() that temporarily releases and re-acquires sk_lock. During this window, if another thread hold vsock_register_mutex while trying to acquire sk_lock, a circular dependency is created. Fix this by releasing vsock_register_mutex before calling transport->release() and vsock_deassign_transport(). This is safe because we don't need to hold vsock_register_mutex while releasing the old transport, and we ensure the new transport won't disappear by obtaining a module reference first via try_module_get().

—No exploit Fix available
Published
Dec 4, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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

    • 7b73bddf54777fb62d4d8c7729d0affe6df04477, 6.16affected
    • 8667e8d0eb46bc54fdae30ba2f4786407d3d88eb and later · before ce4f856c64f0bc30e29302a0ce41f4295ca391c5affected · git
    • 36a439049b34cca0b3661276049b84a1f76cc21a and later · before 09bba278ccde25a14b6e5088a9e65a8717d0cccfaffected · git
    • 9ce53e744f18e73059d3124070e960f3aa9902bf and later · before b44182c116778feaa05da52a426aeb9da1878dcfaffected · git
    • 9d24bb6780282b0255b9929abe5e8f98007e2c6e and later · before 42ed0784d11adebf748711e503af0eb9f1e6d81daffected · git
    • ae2c712ba39c7007de63cb0c75b51ce1caaf1da5 and later · before 251caee792a21eb0b781aab91362b422c945e162affected · git
    • 687aa0c5581b8d4aa87fd92973e4ee576b550cdf and later · before a2a4346eea8b4cb75037dbcb20b98cb454324f80affected · git
    • 687aa0c5581b8d4aa87fd92973e4ee576b550cdf and later · before f7c877e7535260cc7a21484c994e8ce7e8cb6780affected · git
    • 5.10.240 and later · before 5.10.246affected · semver
    • 5.15.189 and later · before 5.15.196affected · 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

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-2025-40229Dec 4, 2025 · mm/damon/core: fix potential memory leak by cleaning ops_filter in damon_destroy_scheme
    0Monitor
  • ← EarlierCVE-2025-40230Dec 4, 2025 · mm: prevent poison consumption when splitting THP
    0Monitor
  • Later →CVE-2025-40232Dec 4, 2025 · rv: Fully convert enabled_monitors to use list_head as iterator
    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 Linux09bba278ccde25a14b6e5088a9e65a8717d0cccfVendor (CNA)
Linux Linux251caee792a21eb0b781aab91362b422c945e162Vendor (CNA)
Linux Linux42ed0784d11adebf748711e503af0eb9f1e6d81dVendor (CNA)
Linux Linux5.10.246Vendor (CNA)
Linux Linux5.15.196Vendor (CNA)
Linux Linux6.1.158Vendor (CNA)
Linux Linux6.12.56Vendor (CNA)
Linux Linux6.16Vendor (CNA)
Linux Linux6.6.115Vendor (CNA)
Linux Linuxa2a4346eea8b4cb75037dbcb20b98cb454324f80Vendor (CNA)
Linux Linuxb44182c116778feaa05da52a426aeb9da1878dcfVendor (CNA)
Linux Linuxce4f856c64f0bc30e29302a0ce41f4295ca391c5Vendor (CNA)
Linux Linuxf7c877e7535260cc7a21484c994e8ce7e8cb6780Vendor (CNA)
debian:linux6.1.158-1 · Debian:12Package 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.

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✗ → ✓

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References

Show all references (6 more)

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

All records