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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-53131] require Ethernet MAC header before using eth_hdr

This high-severity Red Hat Linux advisory covers CVE-2026-53131 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-53131 Source published Source updated

VulniPulse record published Record updated

CVE-2026-53131
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: require Ethernet MAC header before using eth_hdr() `ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and `hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)` after either assuming that the skb is associated with an Ethernet device or checking only that the `ETH_HLEN` bytes at `skb_mac_header(skb)` lie between `skb->head` and `skb->data`.

Make these paths first verify that the skb is associated with an Ethernet device, that the MAC header was set, and that it spans at least a full Ethernet header before accessing `eth_hdr(skb)`.

Certain netfilter modules, including `ip6t_eui64` and `xt_mac`, accessed Ethernet MAC header data without first verifying that an Ethernet device was associated with the network packet or that the MAC header was present and of sufficient length.

This oversight could allow a local or remote attacker to trigger an out-of-bounds read, potentially leading to a system crash and a Denial of Service (DoS). Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

Will not fix / out of support: Red Hat Enterprise Linux 6.

Is CVE-2026-53131 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53131 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53131?

Upgrade to a fixed release named by Red Hat:

  • kernel-0:6.12.0-211.55.1.el10_2
  • kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10
  • kernel-0:4.18.0-553.164.1.el8_10
  • kernel-0:5.14.0-687.42.1.el9_8
  • RHSA-2026:67471
  • RHSA-2026:68532
  • RHSA-2026:68531
  • RHSA-2026:59723

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.55.1.el10_2
  • kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10
  • kernel-0:4.18.0-553.164.1.el8_10
  • kernel-0:5.14.0-687.42.1.el9_8
  • RHSA-2026:67471
  • RHSA-2026:68532
  • RHSA-2026:68531
  • RHSA-2026:59723

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.55.1.el10_2, kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10, kernel-0:4.18.0-553.164.1.el8_10, kernel-0:5.14.0-687.42.1.el9_8, RHSA-2026:67471, RHSA-2026:68532. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 15 days ago·verify at source

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