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NVD / CVE Program· CNA Linux

CVE-2026-46234: vsock: fix buffer size clamping order

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.13% (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 01ef69785dc3162f588a361ab770b1e312800188, 0b68881501460c3761f196469e1e503218c5e536, 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01ef69785dc3162f588a361ab770b1e312800188, 0b68881501460c3761f196469e1e503218c5e536, 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.

Published
May 28, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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.

Follow CVE-2026-46234

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

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
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before f6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccaaffected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before caf11dfea5233a69298a1c448bbf8d1639c80536affected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before 01ef69785dc3162f588a361ab770b1e312800188affected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before a998a7e250bf976539e05a00ec64a81292afecaaaffected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before 310da27932dd0afe7ce7456dfe1f0814c3301f41affected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160affected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before 0b68881501460c3761f196469e1e503218c5e536affected · git
    • b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 and later · before d114bfdc9b76bf93b881e195b7ec957c14227babaffected · git
    • before 5.5not affected · semver
Affected versions · NVD (7)

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 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.90
  • linux linux kernel6.13 and later · before 6.18.32
  • linux linux kernel6.19 and later · before 7.0.9

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.90-16.12.90-1
Debian:14linuxbefore 7.0.9-17.0.9-1

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-2026-46229May 28, 2026 · drm/amdkfd: Clear VRAM on allocation to prevent stale data exposure
    22Monitor
  • ← EarlierCVE-2026-46230May 28, 2026 · drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg
    28Monitor
  • Later →CVE-2026-46235May 28, 2026 · media: saa7164: add ioremap return checks and cleanups
    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 Linux01ef69785dc3162f588a361ab770b1e312800188Vendor (CNA)
Linux Linux0b68881501460c3761f196469e1e503218c5e536Vendor (CNA)
Linux Linux2602f7bb5818e92315feeaeb71d8ce4d5c9ab160Vendor (CNA)
Linux Linux310da27932dd0afe7ce7456dfe1f0814c3301f41Vendor (CNA)
Linux Linuxa998a7e250bf976539e05a00ec64a81292afecaaVendor (CNA)
Linux Linuxcaf11dfea5233a69298a1c448bbf8d1639c80536Vendor (CNA)
Linux Linuxd114bfdc9b76bf93b881e195b7ec957c14227babVendor (CNA)
Linux Linuxf6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccaVendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · 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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

References

Show all references (8 more)

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

All records