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NVD / CVE Program· CNA Linux

CVE-2026-31752: bridge: br_nd_send: validate ND option lengths

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 259466f76f5a2148aff11134e68f4b4c6d52725b, 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2, 837392a38445729c22e03d3abcf33f07763efd85.

Low priority for now. Upgrade to Linux Linux 259466f76f5a2148aff11134e68f4b4c6d52725b, 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2, 837392a38445729c22e03d3abcf33f07763efd85 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: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 2th 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%

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-2026-31752

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 kernel4.15 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • 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

    • 4.15affected
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2affected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before 259466f76f5a2148aff11134e68f4b4c6d52725baffected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43aaffected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aaaffected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before c49b9256bbacb6a135654aebd12e4c0e87166b7caffected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before 837392a38445729c22e03d3abcf33f07763efd85affected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before e71303a9190496136e240c4f2872b7b0b16027a7affected · git
    • ed842faeb2bd49256f00485402f3113205f91d30 and later · before 850837965af15707fd3142c1cf3c5bfaf022299baffected · git
    • before 4.15not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

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-2026-31750May 1, 2026 · comedi: runflags cannot determine whether to reclaim chanlist
    22Monitor
  • ← EarlierCVE-2026-31751May 1, 2026 · comedi: dt2815: add hardware detection to prevent crash
    18Monitor
  • Later →CVE-2026-31753May 1, 2026 · auxdisplay: line-display: fix NULL dereference in linedisp_release
    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 Linux259466f76f5a2148aff11134e68f4b4c6d52725bVendor (CNA)
Linux Linux82a42eceec7c6bdb0e0da94c0542a173b7ea57f2Vendor (CNA)
Linux Linux837392a38445729c22e03d3abcf33f07763efd85Vendor (CNA)
Linux Linux850837965af15707fd3142c1cf3c5bfaf022299bVendor (CNA)
Linux Linuxc49b9256bbacb6a135654aebd12e4c0e87166b7cVendor (CNA)
Linux Linuxe0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aaVendor (CNA)
Linux Linuxe71303a9190496136e240c4f2872b7b0b16027a7Vendor (CNA)
Linux Linuxee02d8991fd7bd86ed6ebd0deb4aab53feb0e43aVendor (CNA)
debian:linux6.1.170-1 · 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).

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (10 more)

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

All records