CVE-2026-93250Hinoki check available

Kernel memory corruption via stale VXLAN MDB entry

Published Sep 24, 2026 · Updated Sep 24, 2026

Use-after-free in the Linux kernel VXLAN MDB code allows local users to corrupt kernel memory during multicast database flushing. vxlan_mdb_flush() saves the next list entry, but flushing a (*, G) entry can free that saved (S, G) entry before the loop deletes it again. Reachability requires authority to delete the VXLAN device or issue a bulk RTM_DELMDB request; the demonstrated result is an invalid eight-byte kernel write.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in the Linux kernel VXLAN MDB code allows local users to corrupt kernel memory during multicast database flushing. vxlan_mdb_flush() saves the next list entry, but flushing a (*, G) entry can free that saved (S, G) entry before the loop deletes it again. Reachability requires authority to delete the VXLAN device or issue a bulk RTM_DELMDB request; the demonstrated result is an invalid eight-byte kernel write.

The record

CVE
CVE-2026-93250
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.4
  2. Affected versionversion=a3a48de5eade770e911d35291217bdd69ce04ef1 <3e6b705bc162fc7257645725a7d2cf6c71250318
  3. Affected versionversion=a3a48de5eade770e911d35291217bdd69ce04ef1 <bc2dc66a6693a78f8c1e6ca2dbebd50f16e2c366
  4. Affected versionversion=a3a48de5eade770e911d35291217bdd69ce04ef1 <c7dc26d06f90ca11bbd6114f6a62a67d038816c7
  5. Affected versionversion=a3a48de5eade770e911d35291217bdd69ce04ef1 <f26400b325bdc2868e40612c4804c82cf8ba6275
  6. Affected versionversion=a3a48de5eade770e911d35291217bdd69ce04ef1 <f8a9b988e7a7bc674e74e8c901794d792c35689e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=a3a48de5eade770e911d35291217bdd69ce04ef1 <3e6b705bc162fc7257645725a7d2cf6c71250318; version=a3a48de5eade770e911d35291217bdd69ce04ef1 <bc2dc66a6693a78f8c1e6ca2dbebd50f16e2c366; version=a3a48de5eade770e911d35291217bdd69ce04ef1 <c7dc26d06f90ca11bbd6114f6a62a67d038816c7; version=a3a48de5eade770e911d35291217bdd69ce04ef1 <f26400b325bdc2868e40612c4804c82cf8ba6275; version=a3a48de5eade770e911d35291217bdd69ce04ef1 <f8a9b988e7a7bc674e74e8c901794d792c35689e

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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