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NVD / CVE Program· CNA Linux

CVE-2025-21669: vsock/virtio: discard packets if the transport changes

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.23% (FIRST EPSS).
  • 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.
  • Fixed version: Linux Linux 18a7fc371d1dbf8deff16c2dd9292bcc73f43040, 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1, 6486915fa661584d70e8e7e4068c6c075c67dd6d; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 18a7fc371d1dbf8deff16c2dd9292bcc73f43040, 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1, 6486915fa661584d70e8e7e4068c6c075c67dd6d; azl3 kernel 6.6.64.2-9 on Azure Linux 3.0 6.6.76.1-1; azl3 kernel 6.6.76.1-1 on Azure Linux 3.0 6.6.76.1-1 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/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jan 31, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 14th percentile

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 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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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.

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 kernel5.5 and later · before 5.15.177
  • linux linux kernel5.16 and later · before 6.1.127
  • linux linux kernel6.2 and later · before 6.6.74
  • linux linux kernel6.7 and later · before 6.12.11
  • linux linux kernel6.13

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

    • 5.5affected
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 18a7fc371d1dbf8deff16c2dd9292bcc73f43040affected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 6486915fa661584d70e8e7e4068c6c075c67dd6daffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 88244163bc7e7b0ce9dd7bf4c8a563b41525c3eeaffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before d88b249e14bd0ee1e46bbe4f456e22e01b8c68deaffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 677579b641af109613564460a4e3bdcb16850b61affected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1affected · git
    • before 5.5not affected · semver
    • 5.10.234 and later · up to and including 5.10.*not affected · semver
    • 5.15.177 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.128-16.1.128-1
Debian:13linuxbefore 6.12.11-16.12.11-1
Red Hat:enterprise_linux:10.0kernelbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64kbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debugbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-debuginfobefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-develbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-devel-matchedbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-modulesbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-modules-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debug-modules-extrabefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-debuginfobefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-develbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-devel-matchedbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-modulesbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-modules-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-64k-modules-extrabefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-abi-stablelistsbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-debugbefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-debug-corebefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0
Red Hat:enterprise_linux:10.0kernel-debug-debuginfobefore 0:6.12.0-55.16.1.el10_00:6.12.0-55.16.1.el10_0

+70

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-21667Jan 31, 2025 · iomap: avoid avoid truncating 64-bit offset to 32 bits
    22Monitor
  • ← EarlierCVE-2025-21668Jan 31, 2025 · pmdomain: imx8mp-blk-ctrl: add missing loop break condition
    22Monitor
  • Later →CVE-2025-21670Jan 31, 2025 · vsock/bpf: return early if transport is not assigned
    22Monitor

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 Linux18a7fc371d1dbf8deff16c2dd9292bcc73f43040Vendor (CNA)
Linux Linux2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1Vendor (CNA)
Linux Linux6486915fa661584d70e8e7e4068c6c075c67dd6dVendor (CNA)
Linux Linux677579b641af109613564460a4e3bdcb16850b61Vendor (CNA)
Linux Linux88244163bc7e7b0ce9dd7bf4c8a563b41525c3eeVendor (CNA)
Linux Linuxd88b249e14bd0ee1e46bbe4f456e22e01b8c68deVendor (CNA)
azl3 kernel 6.6.64.2-9 on Azure Linux 3.06.6.76.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.76.1-1 on Azure Linux 3.06.6.76.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.05.15.180.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-3 on CBL-Mariner 2.05.15.180.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.180.1-1 on CBL Mariner 2.05.15.180.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.128-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:6.12.0-55.16.1.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
rocky linux:kernel0:6.12.0-55.16.1.el10_0 · Rocky Linux:10Package 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.

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

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

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records