CVE-2026-52915

Memory disclosure and crash via oversized option count

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds access in affected Linux Kernel releases allows local users to read kernel memory or crash the system via an oversized ip6t_hbh rule. The hbh_mt6_check rule-setup path accepts an optsnr count above 16, so hbh_mt6 later reads past the fixed opts array while matching packets. A local low-privilege user must be able to install an xtables hbh or dst match rule; successful exploitation exposes kernel memory or crashes the kernel.

CVSS severity7.1
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

Out-of-bounds access in affected Linux Kernel releases allows local users to read kernel memory or crash the system via an oversized ip6t_hbh rule. The hbh_mt6_check rule-setup path accepts an optsnr count above 16, so hbh_mt6 later reads past the fixed opts array while matching packets. A local low-privilege user must be able to install an xtables hbh or dst match rule; successful exploitation exposes kernel memory or crashes the kernel.

The record

CVE
CVE-2026-52915
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
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

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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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2d523ba48d4ecc46acfb6aba548292cfcce1ac02
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <41ec2e242f1702e8370ddfe14d22b7a766021c3e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4322dcde6b4173c2d8e8e6118ed290794263bcc8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <57b0ac5e1b46f1f0338dff392ef2092e2871b412
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <588933f1a2ca5ff99274f8c9f25dc3a25d0191c3
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6feb43c0995ab3a9c826707eb46541a1696fe4f7
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <784aadea7a108c9f90985683caa87fb0198c6a39
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db0250470f023f159094052c0bd5ab026a88ae93
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2d523ba48d4ecc46acfb6aba548292cfcce1ac02; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <41ec2e242f1702e8370ddfe14d22b7a766021c3e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4322dcde6b4173c2d8e8e6118ed290794263bcc8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <57b0ac5e1b46f1f0338dff392ef2092e2871b412; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <588933f1a2ca5ff99274f8c9f25dc3a25d0191c3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6feb43c0995ab3a9c826707eb46541a1696fe4f7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <784aadea7a108c9f90985683caa87fb0198c6a39; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db0250470f023f159094052c0bd5ab026a88ae93; version=2.6.12

Published CVSS scores

7.1LinuxCVSS: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.

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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

T1499.004Application or System Exploitation

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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