CVE-2026-68125 (GCVE-0-2026-68125)
Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-19 16:29
VLAI
EPSS
VEX
Title
mac802154: llsec: reject frames shorter than the authentication tag
Summary
In the Linux kernel, the following vulnerability has been resolved:
mac802154: llsec: reject frames shorter than the authentication tag
llsec_do_decrypt_auth() computes the associated-data length for the
AEAD request as
assoclen += datalen - authlen;
where datalen is the number of bytes after the MAC header and authlen
(4, 8 or 16) is the length of the authentication tag. Nothing verifies
that the frame actually carries at least authlen payload bytes. A
secured frame whose payload is shorter than the tag makes
datalen - authlen negative; assoclen is then passed to
aead_request_set_ad() as an unsigned value close to 4 GiB, so
crypto_aead_decrypt() walks far off the end of the scatterlist that
only spans the real frame.
The frame is fully attacker-controlled and reaches this path from any
IEEE 802.15.4 peer in radio range. Reject frames whose payload is
shorter than the authentication tag before the subtraction.
Dynamically reproduced on a KASAN kernel as a general-protection-fault
in the AEAD scatterwalk, and the fix confirmed.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < f27ce82eb04960465df71634b196a48a4ecafd50
(git)
Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < 2d6b42a61373144298070668fddf06efe79cf2ff (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < ec7e62d77193131227df49d654d118fdf5a59892 (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < 5bbf0cd9b6a7076af86c75e87e180099be2e11ae (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < de80808f37d99c6dc67bb6f97eea00c8f57a8821 (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < f20dedce0429b293d4bad604e0d3f65d8ac96c83 (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < e09e0301d616c1ef38a5e64e8e4326fd39df13cc (git) Affected: 4c14a2fb5d143e4ed94143be2b8c1961b47df9af , < fd3a3f28ed60c6af4b2a39933b151d6b27842c3b (git) |
guessed | |
| Linux | Linux |
Affected:
3.16
Unaffected: 0 , < 3.16 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: reject frames shorter than the authentication tag\n\nllsec_do_decrypt_auth() computes the associated-data length for the\nAEAD request as\n\n\tassoclen += datalen - authlen;\n\nwhere datalen is the number of bytes after the MAC header and authlen\n(4, 8 or 16) is the length of the authentication tag. Nothing verifies\nthat the frame actually carries at least authlen payload bytes. A\nsecured frame whose payload is shorter than the tag makes\ndatalen - authlen negative; assoclen is then passed to\naead_request_set_ad() as an unsigned value close to 4 GiB, so\ncrypto_aead_decrypt() walks far off the end of the scatterlist that\nonly spans the real frame.\n\nThe frame is fully attacker-controlled and reaches this path from any\nIEEE 802.15.4 peer in radio range. Reject frames whose payload is\nshorter than the authentication tag before the subtraction.\n\nDynamically reproduced on a KASAN kernel as a general-protection-fault\nin the AEAD scatterwalk, and the fix confirmed."
}
],
"metrics": [
{
"cvssV3_1": {
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - Exploitation requires sending crafted IEEE 802.15.4 frames over the WPAN radio interface; any peer within RF range can reach mac802154 receive/decrypt without IP routing or local shell access, matching Adjacent wireless attack guidance like Bluetooth.\nAC:L - The attacker fully controls frame length and security header fields; once LLSEC is enabled on the victim, a single undersized MIC-only secured frame reliably triggers the assoclen underflow and was dynamically reproduced as a KASAN GPF.\nPR:N - No Linux credentials or capabilities are required on the target; exploitation is performed by an over-the-air 802.15.4 peer spoofing a known PAN device/key/frame counter, not via local syscalls, ioctl, or netlink.\nUI:N - No victim user action is needed beyond normal operation of an LLSEC-enabled 802.15.4 interface; the malicious frame is processed automatically in the softirq receive path before delivery to userspace.\nS:U - Impact is confined to kernel memory and availability on the attacked host\u0027s WPAN stack; it does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The wrapped assoclen makes crypto_aead_decrypt() scatterwalk read gigabytes beyond the skb-backed scatterlist, causing out-of-bounds kernel memory reads that can disclose adjacent heap or slab data and enable further exploitation primitives.\nI:H - Kernel memory corruption in the AEAD decrypt scatterwalk path can be leveraged for control-flow hijack or arbitrary write primitives beyond the demonstrated crash, consistent with high integrity impact for exploitable OOB access in crypto handlers.\nA:H - The bug was reproduced on a KASAN kernel as a general-protection fault in the AEAD scatterwalk, and repeated malicious frames can panic or hang the kernel on LLSEC-enabled coordinators, gateways, and IoT border routers."
}
]
}
],
"providerMetadata": {
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"title": "mac802154: llsec: reject frames shorter than the authentication tag",
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: reject frames shorter than the authentication tag\n\nllsec_do_decrypt_auth() computes the associated-data length for the\nAEAD request as\n\n\tassoclen += datalen - authlen;\n\nwhere datalen is the number of bytes after the MAC header and authlen\n(4, 8 or 16) is the length of the authentication tag. Nothing verifies\nthat the frame actually carries at least authlen payload bytes. A\nsecured frame whose payload is shorter than the tag makes\ndatalen - authlen negative; assoclen is then passed to\naead_request_set_ad() as an unsigned value close to 4 GiB, so\ncrypto_aead_decrypt() walks far off the end of the scatterlist that\nonly spans the real frame.\n\nThe frame is fully attacker-controlled and reaches this path from any\nIEEE 802.15.4 peer in radio range. Reject frames whose payload is\nshorter than the authentication tag before the subtraction.\n\nDynamically reproduced on a KASAN kernel as a general-protection-fault\nin the AEAD scatterwalk, and the fix confirmed."
}
],
"id": "CVE-2026-68125",
"lastModified": "2026-08-19T17:20:30.007",
"metrics": {
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{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-10T13:19:57.690",
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},
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},
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"url": "https://git.kernel.org/stable/c/f27ce82eb04960465df71634b196a48a4ecafd50"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fd3a3f28ed60c6af4b2a39933b151d6b27842c3b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-31T11:16:36+00:00",
"cve": "CVE-2026-68125",
"id": "CVE-2026-68125",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "233",
"product_status:known_not_affected": "44",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mac802154: llsec: reject frames shorter than the authentication tag",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68125.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:39:45Z",
"cve": "CVE-2026-68125",
"id": "CVE-2026-68125",
"initial_release_date": "2026-08-17T16:29:58Z",
"product_status:known_affected": "673",
"product_status:known_not_affected": "77",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68125",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68125.json",
"version": "10"
}
}
}
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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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