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Linux Kernel CVE-2026-53131

| EUVDEUVD-2026-39336 CRITICAL
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-8cg3-6h68-w2cj
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.4 Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Sources disagree (Medium–Critical)
Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
9.4 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
vuln.today AI
6.5 MEDIUM

Reachable only with non-default MAC-based netfilter/ipset config and non-Ethernet-path packets (AC:H); bounded OOB read leaks limited memory (C:L) and can oops the kernel (A:H), no integrity impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Red Hat
7.0 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:13 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
9.4 (CRITICAL)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
CRITICAL 9.4

DescriptionCVE.org

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).

AnalysisAI

Out-of-bounds memory access in the Linux kernel's netfilter subsystem allows attackers to leak adjacent kernel memory or crash the host by sending packets that traverse MAC-based matching paths (xt_mac, ip6t_eui64, the bitmap:ip,mac/hash:ip,mac/hash:mac ipset types, and nf_log_syslog) which call eth_hdr(skb) without first confirming the skb carries a full Ethernet header. Affected kernels span the 5.15 through 7.1 stable trees prior to the fixed releases, and the impact is information disclosure and denial of service rather than code execution. There is no public exploit identified at time of analysis, and the EPSS score is low at 0.17% (7th percentile).

Technical ContextAI

The flaw lives in Linux netfilter/ipset code that reads the Ethernet header of a socket buffer via eth_hdr(skb). Several match modules and logging paths either assumed the skb was attached to an Ethernet device or only checked that ETH_HLEN bytes at skb_mac_header(skb) lay between skb->head and skb->data, without verifying the device is actually Ethernet, that the MAC header was set, and that it spans a full Ethernet header. When packets arrive via non-Ethernet interfaces (tunnels, loopback, PPP, or other L2 types) or before the MAC header is populated, dereferencing eth_hdr(skb) reads memory outside the valid header region. Although the CVE lists CWE as N/A, the root-cause class is an out-of-bounds read (CWE-125) driven by a missing precondition check; the fix adds verification that the skb is Ethernet-associated and contains a complete L2 header before access.

RemediationAI

Vendor-released patch: update to Linux 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13, or 7.1 (or later) matching your branch, then reboot or apply the corresponding livepatch; the fixes are the stable commits at git.kernel.org/stable/c/ (063f4336…, 367abcac…, 4435888e…, 5d634afb…, 62443dc2…, 726abf97…, cea435ea…). Most distributions ship these in their kernel updates, so apply your distro's patched kernel package. As an interim compensating control where patching must be deferred, remove or avoid MAC-based netfilter rules and ipsets - specifically xt_mac (-m mac) matches, ip6t_eui64 matches, the bitmap:ip,mac, hash:ip,mac, and hash:mac ipset types, and MAC logging via nf_log_syslog - since the vulnerable paths are only reachable when these are in use; the trade-off is loss of MAC-level filtering/logging granularity. Restricting which interfaces (non-Ethernet tunnels, PPP, etc.) feed these rules also reduces exposure. Reference the advisories at https://nvd.nist.gov/vuln/detail/CVE-2026-53131 and https://vuldb.com/vuln/373686.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-53131 vulnerability details – vuln.today
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