CVE-2026-72296 (GCVE-0-2026-72296)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
EPSS
VEX
Title
net: ife: require ETH_HLEN to be pullable in ife_decode()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ife: require ETH_HLEN to be pullable in ife_decode()
ife decode may return after making only the outer IFE header and
metadata pullable. The caller then passes the decapsulated packet to
eth_type_trans(), which expects the inner Ethernet header to be
accessible from the linear data area.
With a malformed IFE frame, the inner Ethernet header may still be
shorter than ETH_HLEN in the linear area, which can lead to a crash in
the original code.
Fix this by extending the pull check in ife_decode() so that the inner
Ethernet header is also guaranteed to be pullable before returning.
Severity
9.1 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 70013f9163bef7fbd9fa62f81cf91b2a7ba66163
(git)
Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < be272e159dfe1207b67332ad6e17adcf59b4ea4b (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 8c8818e52fddb247ff3214622401a4de6ff8482e (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 9433578bff9c100c466a6354574892e55293cb8f (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 1cb42ec10294a55380e52e674b3df2b962648242 (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 5526d1997aea6c9bd865ca4d4894b52e799d735c (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < b69ad768cd4a2ef4e07c18492ae85438ed17c7cb (git) Affected: ef6980b6becb1afd9d82a4f043749a10ae81bf14 , < 9406f6012b7343661efb516a11c62d4db2b62f75 (git) |
guessed | |
| Linux | Linux |
Affected:
4.6
Unaffected: 0 , < 4.6 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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{
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"version": "6.1.178",
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{
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}
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}
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ife: require ETH_HLEN to be pullable in ife_decode()\n\nife decode may return after making only the outer IFE header and\nmetadata pullable. The caller then passes the decapsulated packet to\neth_type_trans(), which expects the inner Ethernet header to be\naccessible from the linear data area.\n\nWith a malformed IFE frame, the inner Ethernet header may still be\nshorter than ETH_HLEN in the linear area, which can lead to a crash in\nthe original code.\n\nFix this by extending the pull check in ife_decode() so that the inner\nEthernet header is also guaranteed to be pullable before returning."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The flaw is hit on the ingress packet receive path (__netif_receive_skb_core\u2192sch_handle_ingress\u2192tc_run\u2192tcf_ife_act\u2192ife_decode) when a remote peer sends a malformed IFE-encapsulated Ethernet frame to a netdev with clsact/ingress IFE decode, as in SDN/NFV/ForCES edge nodes.\nAC:L - Once ingress IFE decode is present, the attacker fully controls the crafted frame (metalen, metadata size, and skb layout) to leave the inner Ethernet header non-linear or shorter than ETH_HLEN, deterministically reaching eth_type_trans() without races or uncontrollable memory layout.\nPR:N - Remote exploitation needs no credentials or capabilities on the victim\u2014only delivery of a malformed frame to an interface already configured with IFE decode; CAP_NET_ADMIN is an operator deployment prerequisite, not attacker privilege (same model as pre-configured nftables offload bugs).\nUI:N - No victim user action is required beyond normal network delivery of attacker-crafted IFE traffic; exploitation does not depend on mounting, opening files, or administrator interaction at attack time.\nS:U - Impact is confined to kernel packet-processing memory within the same kernel security authority; this is not a VM escape, IOMMU bypass, or cross-namespace scope change.\nC:H - eth_type_trans() reads the inner struct ethhdr (h_dest/h_proto) via eth_skb_pull_mac()/eth_skb_pkt_type() without ensuring ETH_HLEN bytes are linear, causing an out-of-bounds kernel read that can disclose adjacent skb/page memory beyond a few bytes.\nI:N - The defect is a missing pskb_may_pull() bounds check leading to out-of-bounds reads and crash; there is no write, UAF, or demonstrated arbitrary modification or control-flow hijack primitive.\nA:H - The fix commit states malformed IFE frames can crash the kernel; accessing a non-linear or undersized inner Ethernet header in eth_type_trans() can trigger KASAN faults, oops, or panic on the softirq receive path."
}
]
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
"url": "https://git.kernel.org/stable/c/9406f6012b7343661efb516a11c62d4db2b62f75"
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"title": "net: ife: require ETH_HLEN to be pullable in ife_decode()",
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"cveId": "CVE-2026-72296",
"datePublished": "2026-08-15T05:55:17.250Z",
"dateReserved": "2026-08-09T03:40:39.917Z",
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ife: require ETH_HLEN to be pullable in ife_decode()\n\nife decode may return after making only the outer IFE header and\nmetadata pullable. The caller then passes the decapsulated packet to\neth_type_trans(), which expects the inner Ethernet header to be\naccessible from the linear data area.\n\nWith a malformed IFE frame, the inner Ethernet header may still be\nshorter than ETH_HLEN in the linear area, which can lead to a crash in\nthe original code.\n\nFix this by extending the pull check in ife_decode() so that the inner\nEthernet header is also guaranteed to be pullable before returning."
}
],
"id": "CVE-2026-72296",
"lastModified": "2026-08-17T06:18:32.417",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.2,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:02.160",
"references": [
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},
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},
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},
{
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},
{
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"url": "https://git.kernel.org/stable/c/be272e159dfe1207b67332ad6e17adcf59b4ea4b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-17T13:43:57+00:00",
"cve": "CVE-2026-72296",
"id": "CVE-2026-72296",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: ife: require ETH_HLEN to be pullable in ife_decode()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72296.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:28:53Z",
"cve": "CVE-2026-72296",
"id": "CVE-2026-72296",
"initial_release_date": "2026-08-22T00:54:10Z",
"product_status:known_affected": "425",
"product_status:known_not_affected": "242",
"product_status:recommended": "275",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72296",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72296.json",
"version": "12"
}
}
}
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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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