CVE-2026-46206

Local kernel memory corruption via tp_meter teardown race

Published May 28, 2026 · Updated May 28, 2026

Use-after-free in Linux Kernel batman-adv from 4.8 allows local users to corrupt kernel memory through concurrent mesh teardown. The batadv_tp_start, batadv_tp_init_recv, and batadv_tp_meter_recv paths accept new sender or receiver sessions after mesh_state leaves BATADV_MESH_ACTIVE, leaving session work tied to freed mesh structures. Namespaced CAP_NET_ADMIN obtainable in a user namespace is required; successful exploitation can disclose or corrupt kernel memory or panic the host.

CVSS severity7.8
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 Linux Kernel batman-adv from 4.8 allows local users to corrupt kernel memory through concurrent mesh teardown. The batadv_tp_start, batadv_tp_init_recv, and batadv_tp_meter_recv paths accept new sender or receiver sessions after mesh_state leaves BATADV_MESH_ACTIVE, leaving session work tied to freed mesh structures. Namespaced CAP_NET_ADMIN obtainable in a user namespace is required; successful exploitation can disclose or corrupt kernel memory or panic the host.

The record

CVE
CVE-2026-46206
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <3243543592425beec83d453793e9d27caa0d8e66
  2. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <ca39545cf07c142b39d474a1439a046bf28def3d
  3. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <e1e2194cc725ec1d41f9412496212f0fa0519c36
  4. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6
  5. Affected versionversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <ff93f86ecbb50a4709c403fc279a396e308edde5
  6. Affected versionversion=4.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <3243543592425beec83d453793e9d27caa0d8e66; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <ca39545cf07c142b39d474a1439a046bf28def3d; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <e1e2194cc725ec1d41f9412496212f0fa0519c36; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6; version=33a3bb4a3345bb511f9c69c913da95d4693e2a4e <ff93f86ecbb50a4709c403fc279a396e308edde5; version=4.8

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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