CVE-2026-64115

Kernel memory corruption via peer-reset use-after-free

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in VMCI vsock in Linux Kernel allows local users to corrupt kernel memory by resetting a connection during handshake. vmci_transport_recv_connecting_server() treats a peer RST as success, so pending-list cleanup is skipped and delayed work performs a second sock_put() after the socket is freed. Reachability requires guest OS users or same-host local users and a listening vsock peer; outcomes include a kernel crash or kernel-level code execution after controlled heap reuse.

CVSS severity8.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in VMCI vsock in Linux Kernel allows local users to corrupt kernel memory by resetting a connection during handshake. vmci_transport_recv_connecting_server() treats a peer RST as success, so pending-list cleanup is skipped and delayed work performs a second sock_put() after the socket is freed. Reachability requires guest OS users or same-host local users and a listening vsock peer; outcomes include a kernel crash or kernel-level code execution after controlled heap reuse.

The record

CVE
CVE-2026-64115
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004, T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=3.9
  2. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <1dd531e28f61edd286edc486ab068f135b5ae1eb
  3. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <1e19f08552b90070ed18bafb1763c78297823af6
  4. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <440447699c681e26ed58e9c309cad718270a18b4
  5. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9
  6. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <99e22ddf4edb63dc8382bc028af928056d3450cf
  7. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <9fe74e42914c851d68069713b7b917a9c33faf26
  8. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb
  9. Affected versionversion=d021c344051af91f42c5ba9fdedc176740cbd238 <ecda37f8faab3220da199335e42564cb7a9ad145

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.9; version=d021c344051af91f42c5ba9fdedc176740cbd238 <1dd531e28f61edd286edc486ab068f135b5ae1eb; version=d021c344051af91f42c5ba9fdedc176740cbd238 <1e19f08552b90070ed18bafb1763c78297823af6; version=d021c344051af91f42c5ba9fdedc176740cbd238 <440447699c681e26ed58e9c309cad718270a18b4; version=d021c344051af91f42c5ba9fdedc176740cbd238 <47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9; version=d021c344051af91f42c5ba9fdedc176740cbd238 <99e22ddf4edb63dc8382bc028af928056d3450cf; version=d021c344051af91f42c5ba9fdedc176740cbd238 <9fe74e42914c851d68069713b7b917a9c33faf26; version=d021c344051af91f42c5ba9fdedc176740cbd238 <cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb; version=d021c344051af91f42c5ba9fdedc176740cbd238 <ecda37f8faab3220da199335e42564cb7a9ad145

Published CVSS scores

8.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation
T1611Escape to Host

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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