CVE-2026-53131 (GCVE-0-2026-53131)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-08-05 12:33
VLAI
EPSS
VEX
Title
netfilter: require Ethernet MAC header before using eth_hdr()
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)`.
Severity
9.4 (Critical)
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4435888e1bf139d2bfe5911643d4217382136743
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 063f43361e884acd7300790e90194430275d0d0c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 726abf97566867f808fec9d8a408eb9698bd570a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 367abcacc13a8e2e7624408b7f593bd1e60e49d9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d634afb8b83b49de562792fd0d047416a43bd4d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cea435ea7e868ea6fdf039bc4f2090c1d829b556 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 62443dc21114c0bbc476fa62973db89743f2f137 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"net/ipv6/netfilter/ip6t_eui64.c",
"net/netfilter/ipset/ip_set_bitmap_ipmac.c",
"net/netfilter/ipset/ip_set_hash_ipmac.c",
"net/netfilter/ipset/ip_set_hash_mac.c",
"net/netfilter/nf_log_syslog.c",
"net/netfilter/xt_mac.c"
],
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"net/netfilter/ipset/ip_set_bitmap_ipmac.c",
"net/netfilter/ipset/ip_set_hash_ipmac.c",
"net/netfilter/ipset/ip_set_hash_mac.c",
"net/netfilter/nf_log_syslog.c",
"net/netfilter/xt_mac.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
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"version": "6.1.176",
"versionType": "semver"
},
{
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"version": "6.6.143",
"versionType": "semver"
},
{
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"version": "6.12.94",
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},
{
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},
{
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},
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"versionType": "original_commit_for_fix"
}
]
}
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"nodes": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: require Ethernet MAC header before using eth_hdr()\n\n`ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and\n`hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)`\nafter either assuming that the skb is associated with an Ethernet\ndevice or checking only that the `ETH_HLEN` bytes at\n`skb_mac_header(skb)` lie between `skb-\u003ehead` and `skb-\u003edata`.\n\nMake these paths first verify that the skb is associated with an\nEthernet device, that the MAC header was set, and that it spans at\nleast a full Ethernet header before accessing `eth_hdr(skb)`."
}
],
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{
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"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H",
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},
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{
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"value": "AV:N - The vulnerable netfilter match, ipset, and logging paths run while processing packets in receive/netdev hooks. In a reasonable firewall, router, VPN, or tunnel deployment with these rules installed, unauthenticated remote packets can reach the vulnerable code.\nAC:L - No race or difficult timing is required; a packet reaching a vulnerable rule with an invalid, unset, non-Ethernet, or too-short MAC header deterministically drives the bad eth_hdr(skb) access. The needed rule/interface setup is a plausible deployment condition, not an exploit race.\nPR:N - The remote packet sender does not need credentials or local privileges once the affected rule or logger is configured. Although rule installation requires CAP_NET_ADMIN, that is not required for the runtime remote-trigger scenario.\nUI:N - Exploitation is triggered by packet processing and does not require a victim user to open a file, mount anything, or perform another action.\nS:U - The impact remains within the kernel/network stack security authority. There is no VM, IOMMU, or separate sandbox boundary crossing.\nC:H - The flaw causes invalid or out-of-bounds reads from the skb MAC header, and those bytes can be copied into logs/ipset state or influence observable match behavior. Per the required guidance, out-of-bounds reads are scored High when not proven strictly harmless.\nI:L - The primitive is a read rather than an arbitrary write or control-flow hijack. However, the wrongly read MAC bytes can influence firewall matches and ipset add/delete/test behavior, giving limited integrity impact.\nA:H - Invalid eth_hdr(skb) access can produce slab out-of-bounds/KASAN reports or kernel oops/panic conditions, and packets can be sent repeatedly. Kernel crashes are High availability impact."
}
]
}
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/063f43361e884acd7300790e90194430275d0d0c"
},
{
"url": "https://git.kernel.org/stable/c/726abf97566867f808fec9d8a408eb9698bd570a"
},
{
"url": "https://git.kernel.org/stable/c/367abcacc13a8e2e7624408b7f593bd1e60e49d9"
},
{
"url": "https://git.kernel.org/stable/c/5d634afb8b83b49de562792fd0d047416a43bd4d"
},
{
"url": "https://git.kernel.org/stable/c/cea435ea7e868ea6fdf039bc4f2090c1d829b556"
},
{
"url": "https://git.kernel.org/stable/c/62443dc21114c0bbc476fa62973db89743f2f137"
}
],
"title": "netfilter: require Ethernet MAC header before using eth_hdr()",
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"cveId": "CVE-2026-53131",
"datePublished": "2026-06-25T08:38:20.489Z",
"dateReserved": "2026-06-09T07:44:35.386Z",
"dateUpdated": "2026-08-05T12:33:25.251Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
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"date": "2026-09-16",
"epss": "0.00425",
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"id": "msrc_CVE-2026-53131",
"initial_release_date": "2026-06-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "netfilter: require Ethernet MAC header before using eth_hdr()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53131.json",
"version": "3"
},
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-15T11:39:14+00:00",
"cve": "CVE-2026-53131",
"id": "CVE-2026-53131",
"initial_release_date": "2026-06-25T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netfilter: require Ethernet MAC header before using eth_hdr()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53131.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-16T00:11:34Z",
"cve": "CVE-2026-53131",
"id": "CVE-2026-53131",
"initial_release_date": "2026-06-26T02:12:35Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "481",
"product_status:known_not_affected": "67",
"product_status:recommended": "521",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-53131",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53131.json",
"version": "20"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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