CVE-2026-64218

Local privilege escalation via report_work use-after-free

Published Jul 24, 2026 · Updated Jul 24, 2026

Use-after-free in Linux kernel batman-adv allows local users to gain kernel privileges by racing mesh-interface teardown. batadv_bla_purge_backbone_gw() frees a stale backbone gateway without canceling or waiting for its report_work, so the worker dereferences freed kernel objects. Low-privilege access through a user namespace is sufficient to control the race, enabling kernel-memory disclosure, modification, control-flow hijacking, or a panic.

CVSS severity7.8
High
EPSS probability0.13%
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 Linux kernel batman-adv allows local users to gain kernel privileges by racing mesh-interface teardown. batadv_bla_purge_backbone_gw() frees a stale backbone gateway without canceling or waiting for its report_work, so the worker dereferences freed kernel objects. Low-privilege access through a user namespace is sufficient to control the race, enabling kernel-memory disclosure, modification, control-flow hijacking, or a panic.

The record

CVE
CVE-2026-64218
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=23721387c409087fd3b97e274f34d3ddc0970b74 <0459430add32ea41f3e2ef9351610e6d33627a6b
  2. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <3423a45e5c3d3c5129f88143a9a969787d7d5a0a
  3. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <48663158222b3b7f6ee6791a67d512ede7fc94bb
  4. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <95a7034661274cf5985708bd2f6d86ee46f88fa9
  5. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <c6de1a5a9c406e30b91f1515a6ce05cc84023baa
  6. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <ce2c0ee4d76d5ee4b391fe0e31334361e25030ec
  7. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <eeddd7bab3d59c1e98642a204141f8c5d6194707
  8. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <f1303adb1e59582f76c22798a2e2e150e054a9e7
  9. Affected versionversion=3.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=23721387c409087fd3b97e274f34d3ddc0970b74 <0459430add32ea41f3e2ef9351610e6d33627a6b; version=23721387c409087fd3b97e274f34d3ddc0970b74 <3423a45e5c3d3c5129f88143a9a969787d7d5a0a; version=23721387c409087fd3b97e274f34d3ddc0970b74 <48663158222b3b7f6ee6791a67d512ede7fc94bb; version=23721387c409087fd3b97e274f34d3ddc0970b74 <95a7034661274cf5985708bd2f6d86ee46f88fa9; version=23721387c409087fd3b97e274f34d3ddc0970b74 <c6de1a5a9c406e30b91f1515a6ce05cc84023baa; version=23721387c409087fd3b97e274f34d3ddc0970b74 <ce2c0ee4d76d5ee4b391fe0e31334361e25030ec; version=23721387c409087fd3b97e274f34d3ddc0970b74 <eeddd7bab3d59c1e98642a204141f8c5d6194707; version=23721387c409087fd3b97e274f34d3ddc0970b74 <f1303adb1e59582f76c22798a2e2e150e054a9e7; version=3.5

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1068Exploitation for Privilege Escalation

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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