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NVD / CVE Program· CNA Linux

CVE-2026-43092: xsk: validate MTU against usable frame size on bind

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: 0.12% (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 25e1e91a8da819924df0b16e3812d7b24c8ce133, 36ee60b569ba0dfb6f961333b90d19ab5b323fa9, a55793e5a97d4e39bdb380873a9780fe0010bff6.

Low priority for now. Upgrade to Linux Linux 25e1e91a8da819924df0b16e3812d7b24c8ce133, 36ee60b569ba0dfb6f961333b90d19ab5b323fa9, a55793e5a97d4e39bdb380873a9780fe0010bff6 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: xsk: validate MTU against usable frame size on bind AF_XDP bind currently accepts zero-copy pool configurations without verifying that the device MTU fits into the usable frame space provided by the UMEM chunk. This becomes a problem since we started to respect tailroom which is subtracted from chunk_size (among with headroom). 2k chunk size might not provide enough space for standard 1500 MTU, so let us catch such settings at bind time. Furthermore, validate whether underlying HW will be able to satisfy configured MTU wrt XSK's frame size multiplied by supported Rx buffer chain length (that is exposed via net_device::xdp_zc_max_segs).

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Jun 17, 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 kernel6.6 and later · before 6.6.136
  • linux linux kernel6.7 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel7.0

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

    • 6.6affected
    • 24ea50127ecf0efe819c1f6230add27abc6ca9d9 and later · before a55793e5a97d4e39bdb380873a9780fe0010bff6affected · git
    • 24ea50127ecf0efe819c1f6230add27abc6ca9d9 and later · before f669d60db11dbabb96279f2b20f9d1cba43cddb2affected · git
    • 24ea50127ecf0efe819c1f6230add27abc6ca9d9 and later · before 25e1e91a8da819924df0b16e3812d7b24c8ce133affected · git
    • 24ea50127ecf0efe819c1f6230add27abc6ca9d9 and later · before b2f4daa6422fd6cc0cec969794dab4a88ea4cea1affected · git
    • 24ea50127ecf0efe819c1f6230add27abc6ca9d9 and later · before 36ee60b569ba0dfb6f961333b90d19ab5b323fa9affected · git
    • before 6.6not affected · semver
    • 6.6.136 and later · up to and including 6.6.*not affected · semver
    • 6.12.83 and later · up to and including 6.12.*not affected · semver
    • 6.18.24 and later · up to and including 6.18.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.14-16.19.14-1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-50.16.4.0-50.1
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-50.16.4.0-50.1
SUSE:Linux Micro 6.0kernel-rtbefore 6.4.0-50.16.4.0-50.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-50.26.4.0-50.2
SUSE:Linux Micro 6.0kernel-source-rtbefore 6.4.0-50.26.4.0-50.2

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-2026-43087May 6, 2026 · pinctrl: mcp23s08: Disable all pin interrupts during probe
    22Monitor
  • ← EarlierCVE-2026-43090May 6, 2026 · xfrm: fix refcount leak in xfrm_migrate_policy_find
    22Monitor
  • Later →CVE-2026-43096May 6, 2026 · mshv: Fix infinite fault loop on permission-denied GPA intercepts
    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 Linux25e1e91a8da819924df0b16e3812d7b24c8ce133Vendor (CNA)
Linux Linux36ee60b569ba0dfb6f961333b90d19ab5b323fa9Vendor (CNA)
Linux Linuxa55793e5a97d4e39bdb380873a9780fe0010bff6Vendor (CNA)
Linux Linuxb2f4daa6422fd6cc0cec969794dab4a88ea4cea1Vendor (CNA)
Linux Linuxf669d60db11dbabb96279f2b20f9d1cba43cddb2Vendor (CNA)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)
suse:kernel-default6.4.0-50.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-50.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-rt6.4.0-50.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-50.2 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source-rt6.4.0-50.2 · SUSE:Linux Micro 6.0Package 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)

—

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 (4 more)

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

All records