CVE-2026-52912

Local privilege escalation via queued bridge use-after-free

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the Linux Kernel netfilter NFQUEUE path allows local users to gain kernel privileges through a queued bridge packet. NFQUEUE retains state and physical-device references but not skb->dev, leaving the rewritten bridge-master pointer stale if that device is freed before verdict reinjection. Exploitation requires low-privileged local access and a bridge/NFQUEUE path; successful reuse compromises kernel confidentiality, integrity, and availability.

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 the Linux Kernel netfilter NFQUEUE path allows local users to gain kernel privileges through a queued bridge packet. NFQUEUE retains state and physical-device references but not skb->dev, leaving the rewritten bridge-master pointer stale if that device is freed before verdict reinjection. Exploitation requires low-privileged local access and a bridge/NFQUEUE path; successful reuse compromises kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-52912
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.7
  2. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <15d464265120ab9818bd673af301deee09bedab2
  3. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <19924bdd8a45ebc72a7b84c57fd63057d1dc75ac
  4. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be
  5. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <3823c27099cfe2482299065814adbaa771be9644
  6. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <3fb0f5c0f64162a8c3f25616a4f1e340b921737f
  7. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <950d809f154dca04e5fbe5d3c8b9c5e44769cd57
  8. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <a698ac8ab2561cf575d2d9f34095032651dd952e
  9. Affected versionversion=ac28634456867b23b95faccba7997a62ec430603 <e196115ec330a18de415bdb9f5071aa9f08e53ce

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.7; version=ac28634456867b23b95faccba7997a62ec430603 <15d464265120ab9818bd673af301deee09bedab2; version=ac28634456867b23b95faccba7997a62ec430603 <19924bdd8a45ebc72a7b84c57fd63057d1dc75ac; version=ac28634456867b23b95faccba7997a62ec430603 <1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be; version=ac28634456867b23b95faccba7997a62ec430603 <3823c27099cfe2482299065814adbaa771be9644; version=ac28634456867b23b95faccba7997a62ec430603 <3fb0f5c0f64162a8c3f25616a4f1e340b921737f; version=ac28634456867b23b95faccba7997a62ec430603 <950d809f154dca04e5fbe5d3c8b9c5e44769cd57; version=ac28634456867b23b95faccba7997a62ec430603 <a698ac8ab2561cf575d2d9f34095032651dd952e; version=ac28634456867b23b95faccba7997a62ec430603 <e196115ec330a18de415bdb9f5071aa9f08e53ce

Published CVSS scores

7.8Linux kernel.org CNACVSS:3.1/AV:L/AC:L/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.

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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
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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