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NVD / CVE Program· CNA Linux

CVE-2026-64090: batman-adv: tt: avoid empty VLAN responses

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 1f467d9a095211d3f77e8ff1bee90e73ffe01c64, 99f17d1cdb371cbd037975239b321f346d38f6d2, 9a02c8fc963ddeecb5d8788be0740c1869fc54b7.

Low priority for now. Upgrade to Linux Linux 1f467d9a095211d3f77e8ff1bee90e73ffe01c64, 99f17d1cdb371cbd037975239b321f346d38f6d2, 9a02c8fc963ddeecb5d8788be0740c1869fc54b7 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: batman-adv: tt: avoid empty VLAN responses The commit 16116dac2339 ("batman-adv: prevent TT request storms by not sending inconsistent TT TLVLs") added checks to the local (direct) TT response code. But the response can also be done indirectly by another node using the global TT state. To avoid such inconsistency states reported in the original fix, also avoid sending empty VLANs for replies from the global TT state.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Aug 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%

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 kernel3.13 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.93
  • linux linux kernel6.13 and later · before 6.18.34
  • linux linux kernel6.19 and later · before 7.0.11
  • 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

    • 3.13affected
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before 1f467d9a095211d3f77e8ff1bee90e73ffe01c64affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before 9a02c8fc963ddeecb5d8788be0740c1869fc54b7affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before ea4f757641430bcc8322772e161453c4db5ecb64affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before 99f17d1cdb371cbd037975239b321f346d38f6d2affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before cfb30645280a2131e46cbd1b9a38cfd3ff893f12affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before b93ca6012712ecab2b551e120d7c95038d6a89e5affected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before ab26e346322648f5c39de017d9723c9256284fceaffected · git
    • 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b and later · before fa1bd704940b5bcbc32c0b28db9167405c8ee5e0affected · git
    • before 3.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
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-2026-31431crypto: 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-2026-64088Jul 19, 2026 · batman-adv: tt: fix negative tt_buff_len
    35Monitor
  • ← EarlierCVE-2026-64089Jul 19, 2026 · batman-adv: tt: fix negative last_changeset_len
    39Monitor
  • Later →CVE-2026-64091Jul 19, 2026 · batman-adv: tt: fix TOCTOU race for reported vlans
    39Monitor

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 Linux1f467d9a095211d3f77e8ff1bee90e73ffe01c64Vendor (CNA)
Linux Linux99f17d1cdb371cbd037975239b321f346d38f6d2Vendor (CNA)
Linux Linux9a02c8fc963ddeecb5d8788be0740c1869fc54b7Vendor (CNA)
Linux Linuxab26e346322648f5c39de017d9723c9256284fceVendor (CNA)
Linux Linuxb93ca6012712ecab2b551e120d7c95038d6a89e5Vendor (CNA)
Linux Linuxcfb30645280a2131e46cbd1b9a38cfd3ff893f12Vendor (CNA)
Linux Linuxea4f757641430bcc8322772e161453c4db5ecb64Vendor (CNA)
Linux Linuxfa1bd704940b5bcbc32c0b28db9167405c8ee5e0Vendor (CNA)
debian:linux6.1.176-1 · 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.

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).

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