CVE-2026-53223

Kernel heap disclosure or crash via skb misclassification

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds read in affected Linux Kernel releases allows local users to disclose kernel heap data or crash the host. skb_is_err_queue() mistakes AF_PACKET outgoing receive skbs for error-queue skbs, interprets their control buffer as sock_exterr_skb, and copies beyond a non-linear skb's head. Successful exploitation requires local code execution, CAP_NET_RAW in the governing user namespace, timestamping, SO_RXQ_OVFL, an odd drop count, and a non-linear skb.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in affected Linux Kernel releases allows local users to disclose kernel heap data or crash the host. skb_is_err_queue() mistakes AF_PACKET outgoing receive skbs for error-queue skbs, interprets their control buffer as sock_exterr_skb, and copies beyond a non-linear skb's head. Successful exploitation requires local code execution, CAP_NET_RAW in the governing user namespace, timestamping, SO_RXQ_OVFL, an odd drop count, and a non-linear skb.

The record

CVE
CVE-2026-53223
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=4.10.14 <4.11
  2. Affected versionversion=4.11
  3. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <1ee90b77b727df903033db873c75caac5c27ec98
  4. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <24a0d548d3a765cd4558224e4f8e06e14cba26e3
  5. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <3dde4fb941fa5649ab809f6cd3e20e0c424a4e31
  6. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <71ff5cdd5da61d0438e902aa0fd68c28bc901abe
  7. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <ad9a0374ee6d11048e1f74cd5180bad58b9848b4
  8. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <b903e9b5629ec8dd6db92174070045bf81ad7060
  9. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <e0665b2a8e90bb08bd205062c75662b502d31797
  10. Affected versionversion=8605330aac5a5785630aec8f64378a54891937cc <eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a
  11. Affected versionversion=cdaf15b43bd31003220cb080bcbbd57787a2fca9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.10.14 <4.11; version=4.11; version=8605330aac5a5785630aec8f64378a54891937cc <1ee90b77b727df903033db873c75caac5c27ec98; version=8605330aac5a5785630aec8f64378a54891937cc <24a0d548d3a765cd4558224e4f8e06e14cba26e3; version=8605330aac5a5785630aec8f64378a54891937cc <3dde4fb941fa5649ab809f6cd3e20e0c424a4e31; version=8605330aac5a5785630aec8f64378a54891937cc <71ff5cdd5da61d0438e902aa0fd68c28bc901abe; version=8605330aac5a5785630aec8f64378a54891937cc <ad9a0374ee6d11048e1f74cd5180bad58b9848b4; version=8605330aac5a5785630aec8f64378a54891937cc <b903e9b5629ec8dd6db92174070045bf81ad7060; version=8605330aac5a5785630aec8f64378a54891937cc <e0665b2a8e90bb08bd205062c75662b502d31797; version=8605330aac5a5785630aec8f64378a54891937cc <eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a; version=cdaf15b43bd31003220cb080bcbbd57787a2fca9

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo