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CVE-2026-64090 Linux CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T16:17:49.837Z and has not been modified since then. CVE-2026-64090 relates to a Linux kernel vulnerability in batman-adv, specifically avoiding empty VLAN responses in the TT to prevent TT request storms. The fix ensures consistency in TT responses, both directly and indirectly, through global TT state updates. Linux kernel users and administrators should review the CVE record and apply patches for CVE-2026-64090.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-08-11
Advisory published
2026-07-19
Advisory updated
2026-08-11

Who should care

Linux kernel users and administrators should review and apply patches for CVE-2026-64090. System operators, platform administrators, vulnerability management teams, and security teams should assess their exposure to this vulnerability and take necessary actions to secure their systems.

Technical summary

The Linux kernel vulnerability CVE-2026-64090 relates to batman-adv, which is a part of the Linux kernel. The issue involves avoiding empty VLAN responses in the TT (Translation Table) to prevent TT request storms. The fix ensures consistency in TT responses, both directly and indirectly, through global TT state updates. This update prevents inconsistent TT TLVLs from being sent, which could lead to TT request storms.

Defensive priority

Medium

Recommended defensive actions

  • Review Linux kernel updates for CVE-2026-64090
  • Apply patches for batman-adv TT responses
  • Monitor for potential TT request storms
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide limited information. Defensive verification tasks are recommended to ensure system security. Evidence limits suggest focusing on CVE-2026-64090 details and batman-adv TT response consistency. Defenders should verify Linux kernel updates, review system exposure, and monitor for potential TT request storms.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-64090 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-64090

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-64090 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64090

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/1f467d9a095211d3f77e8ff1bee90e73ffe01c64

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/99f17d1cdb371cbd037975239b321f346d38f6d2

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/9a02c8fc963ddeecb5d8788be0740c1869fc54b7

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ab26e346322648f5c39de017d9723c9256284fce

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b93ca6012712ecab2b551e120d7c95038d6a89e5

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/cfb30645280a2131e46cbd1b9a38cfd3ff893f12

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ea4f757641430bcc8322772e161453c4db5ecb64

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.