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NVD / CVE Program· CNA Linux

CVE-2026-64515: wifi: mac80211: fix MLE defragmentation

Noroxi assessment

Priority: Monitor (action score 33/100)

  • 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: 0.23% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4, 55c479aae99b120489a432db9c717484e523dfd6, 722b3f86df80644463d29fe5451e30a617f74500.

Low priority for now. Upgrade to Linux Linux 1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4, 55c479aae99b120489a432db9c717484e523dfd6, 722b3f86df80644463d29fe5451e30a617f74500 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: wifi: mac80211: fix MLE defragmentation If either reconf or EPCS multi-link element (MLE) is contained in a non-transmitted profile, the defragmentation routine is called with a pointer to the defragmented copy, but the original elements. This is incorrect for two reasons: - if the original defragmentation was needed, it will not find the correct data - if the original frame is at a higher address, the parsing will potentially overrun the heap data (though given the layout of the buffers, only into the new defragmentation buffer, and then it has to stop and fail once that's filled with copied data. Fix it by tracking the container along with the pointer and in doing so also unify the two almost identical defragmentation routines.

HighCVSS 8.3 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Nov 3, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
33 / 40 · 8.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2026-64515

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.

—

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

    • 6.9affected
    • 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and later · before 1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4affected · git
    • 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and later · before 55c479aae99b120489a432db9c717484e523dfd6affected · git
    • 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and later · before 722b3f86df80644463d29fe5451e30a617f74500affected · git
    • 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and later · before a74e893f30db64cdce0fc7a96d3baa417bcd55f5affected · git
    • before 6.9not affected · semver
    • 6.12.92 and later · up to and including 6.12.*not affected · semver
    • 6.18.34 and later · up to and including 6.18.*not affected · semver
    • 7.0.11 and later · up to and including 7.0.*not affected · semver
    • 7.1 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

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-2026-64513Jul 25, 2026 · KVM: x86: Unconditionally recompute CR8 intercept on PPR update
    0Monitor
  • ← EarlierCVE-2026-64514Jul 25, 2026 · userfaultfd: gate must_wait writability check on pte_present()
    0Monitor
  • Later →CVE-2026-64516Jul 25, 2026 · drm/amdgpu/vce1: Fix VCE 1 firmware size and offsets
    35Monitor

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 Linux1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4Vendor (CNA)
Linux Linux55c479aae99b120489a432db9c717484e523dfd6Vendor (CNA)
Linux Linux722b3f86df80644463d29fe5451e30a617f74500Vendor (CNA)
Linux Linuxa74e893f30db64cdce0fc7a96d3baa417bcd55f5Vendor (CNA)
debian:linux6.12.94-1 · Debian:13Package 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.

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.

  • CVE-2026-7209821 days apartdm-verity: fix buffer overflow in FEC calculation
    39Monitor
  • CVE-2025-68811193 days apartsvcrdma: use rc_pageoff for memcpy byte offset
    39Monitor
  • CVE-2026-6812816 days apartice: reject out-of-range ptype in ice_parser_profile_init
    35Monitor
  • CVE-2026-645522 days apartvirtio-net: fix len check in receive_big()
    33Monitor
  • CVE-2026-6837616 days apartsctp: fix auth_hmacs array size in struct sctp_cookie
    32Monitor
  • CVE-2024-140401 days apartnet: nexthop: Increase weight to u16
    31Monitor

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 on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-secondary

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 (3 more)

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

All records