CVE-2026-64355 (GCVE-0-2026-64355)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-10-19 20:38
VLAI
EPSS
VEX
Title
bpf: Reject fragmented frames in devmap
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Reject fragmented frames in devmap
Devmap broadcast redirects clone the packet for all but the last
destination.
For native XDP, that clone path copies only the linear xdp_frame data,
while fragmented frames keep skb_shared_info in tailroom outside the
linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but
without valid frag metadata, and the later free path can interpret
uninitialized tail data as skb_shared_info, leading to an out-of-bounds
access during frame return.
Reject fragmented native XDP frames in dev_map_enqueue_clone().
Add the same restriction to the generic XDP clone path in
dev_map_redirect_clone(). Generic XDP represents fragmented packets as
nonlinear skbs, and rejecting them here keeps clone-based broadcast
support aligned between native and generic XDP.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:39 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 47baddc856ae7e93a565dd9deeb797999b179466
(git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 07a4c11ee8ef4abcb39d922e9e410ae269671cdf (git) Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < bccbab36ff228e0825eb85d9b0f9b8434cd0a399 (git) Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < c5b4f5efcb55c1af3fe44ff712d31b7fb098a831 (git) Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < a9bb2d9c798cb62a4050a991c27b752770c33afe (git) Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 51d07c12ca411e692c424ecdabf077f1e61a61be (git) Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < aa496720618f1a6054f1c870bf10b4f6c99bf656 (git) |
guessed | |
| Linux | Linux |
Affected:
5.14
Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"url": "https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
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"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
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},
{
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"value": "CWE-787"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
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"current_release_date": "2026-08-05T14:10:48+00:00",
"cve": "CVE-2026-64355",
"id": "CVE-2026-64355",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Reject fragmented frames in devmap",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64355.json",
"version": "3"
},
"vulnrichment": {
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"options": [
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},
{
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},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:39:19.688076Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"title": "CISA ADP Vulnrichment"
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"product": "Linux",
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"status": "unaffected",
"version": "6.1.178",
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{
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"version": "6.12.96",
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{
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"version": "6.18.39",
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{
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},
{
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"version": "7.2",
"versionType": "original_commit_for_fix"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP."
}
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"value": "AV:N - A remote peer can send an oversized packet that a fragment-capable NIC represents as a multi-buffer XDP frame, reaching the vulnerable devmap broadcast clone path on a configured forwarding host.\nAC:L - No race or uncontrollable timing condition is required; fragmented packets reliably enter the faulty clone path and can be sent repeatedly.\nPR:N - Although initial-namespace CAP_BPF and CAP_NET_ADMIN are needed to configure the XDP deployment, the attacker sending packets through the already-configured unauthenticated data path needs no privileges.\nUI:N - Packet reception and XDP processing occur automatically without victim action.\nS:U - The corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, IOMMU, or other distinct boundary.\nC:H - Uninitialized fragment descriptors are consumed as page references and can be used by scatter-gather transmitters for unintended DMA mappings, potentially exposing arbitrary kernel memory.\nI:H - An uninitialized fragment count can overrun fixed-size driver arrays, while bogus page references can cause invalid refcount decrements, premature frees, and exploitable kernel memory corruption.\nA:H - Invalid fragment metadata can fault during DMA mapping, transmission, or frame return and cause a kernel oops or panic; an attacker can trigger this repeatedly."
}
]
}
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}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.