CVE-2026-52942

Local kernel-memory disclosure via unset MAC header logging

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds read in affected Linux Kernel versions allows local users to disclose kernel memory through Netfilter packet logging. dump_mac_header() tests only whether mac_header differs from network_header; when it is unset at 0xffff, skb_mac_header() points about 64 KiB beyond skb->head and copies bytes into the kernel log. Reachability requires a netdev nftables log rule and an AF_PACKET frame sent with PACKET_QDISC_BYPASS, which bypasses the path that normally resets the header.

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 read in affected Linux Kernel versions allows local users to disclose kernel memory through Netfilter packet logging. dump_mac_header() tests only whether mac_header differs from network_header; when it is unset at 0xffff, skb_mac_header() points about 64 KiB beyond skb->head and copies bytes into the kernel log. Reachability requires a netdev nftables log rule and an AF_PACKET frame sent with PACKET_QDISC_BYPASS, which bypasses the path that normally resets the header.

The record

CVE
CVE-2026-52942
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

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=2.6.36
  2. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <65ef7397eb9a296e91839f5fd10be96f23d332e7
  3. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <8a81e336da685423f5b64aac4d571e63d674c52a
  4. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <a84b6fedbc97078788be78dbdd7517d143ad1a77
  5. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <af1b7699466f6556b351fa25d3dc870abfb5d310
  6. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <befb8968a2abdfa948d5600ea7f7a509a292a590
  7. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <c38d41134085193efd5b237cf513ad5b3421a60d
  8. Affected versionversion=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <d704ee9c7bc68a161684c51a7ac05b446dcf38d4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.36; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <65ef7397eb9a296e91839f5fd10be96f23d332e7; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <8a81e336da685423f5b64aac4d571e63d674c52a; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <a84b6fedbc97078788be78dbdd7517d143ad1a77; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <af1b7699466f6556b351fa25d3dc870abfb5d310; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <befb8968a2abdfa948d5600ea7f7a509a292a590; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <c38d41134085193efd5b237cf513ad5b3421a60d; version=7eb9282cd0efac08b8377cbd5037ba297c77e3f7 <d704ee9c7bc68a161684c51a7ac05b446dcf38d4

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.

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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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