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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98568: vxlan: use one headroom snapshot for neighbour replies

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 3.13, 3.14, 315d42ca39f69846662961c25dcf2bb07c350d14; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3.13, 3.14, 315d42ca39f69846662961c25dcf2bb07c350d14; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: vxlan: use one headroom snapshot for neighbour replies vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then samples it again to reserve headroom. A concurrent vxlan_changelink() can update needed_headroom between the two reads, creating a TOCTOU race. The second value can exceed the allocation and make the Ethernet header write out of bounds. The race is reproducible on the unpatched kernel. It occurred when vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte skbuff_small_head allocation. Snapshot the headroom once and use that value for both allocation and reservation.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • d8be18c52dbc94989f6d74637b731af39cd3d902, 3927dace523706cc00f808520eaf2125dd7c07b5, 3.14affected
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before e3e24f4c434c56952412f875b834aa9daaa4fb15affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before 9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before fcaf456092dc86fd5b0b523ac27ec0d114066931affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before 45a67662bf8ce3aa5643accf98d328dfbb47eaf6affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before 315d42ca39f69846662961c25dcf2bb07c350d14affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before a3c5eb6e382dd426a5e7eb08608897ed57167ff7affected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before ff022fd9d0f0282c575e11778b96bd1b637503ebaffected · git
    • 4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa and later · before 481506a756dcd828ef42391cb08f38d8d96d38fcaffected · git
    • 3.12.18 and later · before 3.13affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98566Oct 18, 2026 · drm/imagination: clamp freelist reconstruction requests
    0Monitor
  • ← EarlierCVE-2026-98567Oct 18, 2026 · net: xps: reject an out of range traffic class
    0Monitor
  • Later →CVE-2026-98569Oct 18, 2026 · ip_gre: Reject enabling collect metadata through changelink
    0Monitor

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 Linux3.13Vendor (CNA)
Linux Linux3.14Vendor (CNA)
Linux Linux315d42ca39f69846662961c25dcf2bb07c350d14Vendor (CNA)
Linux Linux45a67662bf8ce3aa5643accf98d328dfbb47eaf6Vendor (CNA)
Linux Linux481506a756dcd828ef42391cb08f38d8d96d38fcVendor (CNA)
Linux Linux9ed5a548b42d46e6968a46b67ca8a8e49b12a5a1Vendor (CNA)
Linux Linuxa3c5eb6e382dd426a5e7eb08608897ed57167ff7Vendor (CNA)
Linux Linuxe3e24f4c434c56952412f875b834aa9daaa4fb15Vendor (CNA)
Linux Linuxfcaf456092dc86fd5b0b523ac27ec0d114066931Vendor (CNA)
Linux Linuxff022fd9d0f0282c575e11778b96bd1b637503ebVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+18 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (7 more)

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

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