CVE-2026-46233

Kernel fault via released claim purge race

Published May 28, 2026 · Updated May 28, 2026

NULL-pointer dereference in batman-adv in Linux Kernel allows attackers to trigger a kernel fault during bridge-loop claim purging. batadv_bla_purge_claims() walks the claim hash under only an RCU read lock, so a parallel batadv_claim_put() can release a claim and clear backbone_gw before batadv_bla_claim_get_backbone_gw() dereferences it. The vulnerable path requires an active batman-adv mesh using bridge-loop avoidance and a claim-release race; published material does not identify the attacker-controlled action that wins the race.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in batman-adv in Linux Kernel allows attackers to trigger a kernel fault during bridge-loop claim purging. batadv_bla_purge_claims() walks the claim hash under only an RCU read lock, so a parallel batadv_claim_put() can release a claim and clear backbone_gw before batadv_bla_claim_get_backbone_gw() dereferences it. The vulnerable path requires an active batman-adv mesh using bridge-loop avoidance and a claim-release race; published material does not identify the attacker-controlled action that wins the race.

The record

CVE
CVE-2026-46233
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
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=23721387c409087fd3b97e274f34d3ddc0970b74 <7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe
  2. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <7b8fbcee3184d848b5aee085ca16d0cf05c9b641
  3. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d
  4. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <b65365d2b1e6095c538d49baeb140dd1c166c1b3
  5. Affected versionversion=23721387c409087fd3b97e274f34d3ddc0970b74 <cf6b604011591865ae39ac82de8978c1120d17af
  6. Affected versionversion=3.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=23721387c409087fd3b97e274f34d3ddc0970b74 <7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe; version=23721387c409087fd3b97e274f34d3ddc0970b74 <7b8fbcee3184d848b5aee085ca16d0cf05c9b641; version=23721387c409087fd3b97e274f34d3ddc0970b74 <ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d; version=23721387c409087fd3b97e274f34d3ddc0970b74 <b65365d2b1e6095c538d49baeb140dd1c166c1b3; version=23721387c409087fd3b97e274f34d3ddc0970b74 <cf6b604011591865ae39ac82de8978c1120d17af; version=3.5

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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

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 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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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