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NVD / CVE Program· CNA Linux

CVE-2026-52928: af_unix: Reject SIOCATMARK on non-stream sockets

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: 0.11% (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 3147ddf5a41c20c45c2eb69e00b62f10f822056a, 645b1ed3259af38b7814242a420bc2081bdd1eb6, b741c9c6ef59f17c1f104ddf1217ef77f79ed29b; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3147ddf5a41c20c45c2eb69e00b62f10f822056a, 645b1ed3259af38b7814242a420bc2081bdd1eb6, b741c9c6ef59f17c1f104ddf1217ef77f79ed29b; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1 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: af_unix: Reject SIOCATMARK on non-stream sockets SIOCATMARK reports whether the receive queue is at the urgent mark for MSG_OOB. In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets. SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(), so they should not support SIOCATMARK either. Return -EOPNOTSUPP for non-stream sockets before checking the receive queue.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 24, 2026
Updated
Oct 15, 2026
EPSS
0.1% · 1th percentile
CWE
—

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%

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

  • when it enters CISA KEV
  • 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

Affected versions

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

  • linux linux kernel5.15 and later · before 5.15.211
  • linux linux kernel5.16 and later · before 6.1.177
  • linux linux kernel6.2 and later · before 6.6.144
  • linux linux kernel6.7 and later · before 6.12.88
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 7.0.7
  • linux linux kernel7.1

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

    • 5.15affected
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before ec123873fdc83e7244c8ed6d17b8f8ea6c416a67affected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before f085971de6d6b8ef946a5e0bcd73ff24509a0f85affected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before b741c9c6ef59f17c1f104ddf1217ef77f79ed29baffected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before 645b1ed3259af38b7814242a420bc2081bdd1eb6affected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before c34c41446acf6c0d13b5b06c809be11e0f7f2729affected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before 3147ddf5a41c20c45c2eb69e00b62f10f822056aaffected · git
    • 314001f0bf927015e459c9d387d62a231fe93af3 and later · before d119775f2bad827edc28071c061fdd4a91f889a5affected · git
    • before 5.15not affected · semver
    • 5.15.211 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 6.1.177-16.1.177-1
Debian:13linuxbefore 6.12.88-16.12.88-1
Debian:14linuxbefore 7.0.7-17.0.7-1

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-2026-52924Jun 24, 2026 · sctp: purge outqueue on stale COOKIE-ECHO handling
    39Monitor
  • ← EarlierCVE-2026-52927Jun 24, 2026 · netfilter: ebtables: fix OOB read in compat_mtw_from_user
    31Monitor
  • Later →CVE-2026-52929Jun 24, 2026 · sctp: stream: fully roll back denied add-stream state
    30Monitor

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 Linux3147ddf5a41c20c45c2eb69e00b62f10f822056aVendor (CNA)
Linux Linux645b1ed3259af38b7814242a420bc2081bdd1eb6Vendor (CNA)
Linux Linuxb741c9c6ef59f17c1f104ddf1217ef77f79ed29bVendor (CNA)
Linux Linuxc34c41446acf6c0d13b5b06c809be11e0f7f2729Vendor (CNA)
Linux Linuxd119775f2bad827edc28071c061fdd4a91f889a5Vendor (CNA)
Linux Linuxec123873fdc83e7244c8ed6d17b8f8ea6c416a67Vendor (CNA)
Linux Linuxf085971de6d6b8ef946a5e0bcd73ff24509a0f85Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.144.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.177-1 · 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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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)

—

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 (7 more)

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

All records