CVE-2026-52927

Kernel memory exposure via undersized ebtables extension

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds read in Linux Kernel ebtables allows local users to read adjacent kernel memory via a crafted 32-bit compatibility rule. compat_mtw_from_user trusts undersized match_size or target_size values before callbacks read or write structures using the larger required compatsize. Reachability requires a local EBT_SO_SET_ENTRIES call and CAP_NET_ADMIN, which can be available in user and network namespaces; consequences include kernel-memory disclosure, corruption, or a kernel fault.

CVSS severity7.8
High
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

Out-of-bounds read in Linux Kernel ebtables allows local users to read adjacent kernel memory via a crafted 32-bit compatibility rule. compat_mtw_from_user trusts undersized match_size or target_size values before callbacks read or write structures using the larger required compatsize. Reachability requires a local EBT_SO_SET_ENTRIES call and CAP_NET_ADMIN, which can be available in user and network namespaces; consequences include kernel-memory disclosure, corruption, or a kernel fault.

The record

CVE
CVE-2026-52927
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
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=2.6.34
  2. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <21af4c030567d2e6c89bb927bc18b51fba52a400
  3. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <7ad0e463fc7eafae2141cc38054264636f8b3e94
  4. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <a27cb7325a6c69970041c7f8541fafed5a1ea3ec
  5. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <bf8e8eac7ede51dc318e06acef5a896dcbba7595
  6. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00
  7. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <dad9ebf8107955bb54bd3f9cf22591b6ff37bac1
  8. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <f438d1786d657d57790c5d138d6db3fc9fdac392
  9. Affected versionversion=81e675c227ec60a0bdcbb547dc530ebee23ff931 <fcc4c043d137e7f1de4673dba1f3116e45377c67

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.34; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <21af4c030567d2e6c89bb927bc18b51fba52a400; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <7ad0e463fc7eafae2141cc38054264636f8b3e94; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <a27cb7325a6c69970041c7f8541fafed5a1ea3ec; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <bf8e8eac7ede51dc318e06acef5a896dcbba7595; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <dad9ebf8107955bb54bd3f9cf22591b6ff37bac1; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <f438d1786d657d57790c5d138d6db3fc9fdac392; version=81e675c227ec60a0bdcbb547dc530ebee23ff931 <fcc4c043d137e7f1de4673dba1f3116e45377c67

Published CVSS scores

7.8kernel.orgCVSS: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-125Out-of-bounds Read

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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