CVE-2026-68452 (GCVE-0-2026-68452)
Vulnerability from cvelistv5 – Published: 2026-08-13 13:59 – Updated: 2026-10-19 21:09
VLAI
EPSS
VEX
Title
s390/zcrypt: Validate length for CCA AES cipher key requests
Summary
In the Linux kernel, the following vulnerability has been resolved:
s390/zcrypt: Validate length for CCA AES cipher key requests
cca_cipher2protkey() derives the copy length for the CPRB parameter
block directly from the length field in the key token. Reject the
request early if the token length exceeds the available space in the
parameter block.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:49 UTC
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < be037204e4f595e4bd2159acda146677a1dc6342
(git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 4e500ecb6704d879f9c2417c2ed6faba595015ca (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 7f9e5a3dbb14a9b321a1dfa30390402c673f82dc (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 406b317ea2b501f6f5eca1264293c9399a73a778 (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 4fc46deceda076d429ef3fab2ccf8d96629ebd23 (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < ad93a1f1a45652478c0cf4eb029114e03af57f3b (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 3859f630b674801a00bca39bc451f52288591f65 (git) Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 06afe425d5283b9764303de47f554da5a808ce8a (git) |
guessed | |
| Linux | Linux |
Affected:
5.4
Unaffected: 0 , < 5.4 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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{
"other": {
"content": {
"id": "CVE-2026-68452",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:49:15.916334Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
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"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
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],
"cna": {
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"product": "Linux",
"programFiles": [
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],
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"vendor": "Linux",
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"vendor": "Linux",
"versions": [
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"version": "5.4"
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"version": "0",
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"versionType": "original_commit_for_fix"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Validate length for CCA AES cipher key requests\n\ncca_cipher2protkey() derives the copy length for the CPRB parameter\nblock directly from the length field in the key token. Reject the\nrequest early if the token length exceeds the available space in the\nparameter block."
}
],
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"value": "AV:L - The bug is reached through an ioctl (PKEY_KBLOB2PROTK2/3) on the /dev/pkey character device, requiring local access to the s390 system; there is no remote or adjacent-network path to cca_cipher2protkey().\nAC:L - The overflow is fully deterministic: the attacker sets the token\u0027s len field to any value up to the 8192-byte ioctl limit and the memcpy into the 512-byte parameter block happens unconditionally, before any crypto card interaction, with no race or unknown state involved.\nPR:L - The pkey misc device is registered with .mode = 0666 and neither pkey_api.c, pkey_base.c nor pkey_cca.c performs any capable()/CAP_* check, so any unprivileged local user can open it and issue the key-to-protkey ioctl.\nUI:N - The attacker triggers the overflow entirely on its own by issuing the ioctl with a crafted CCA AES cipher key token; no victim action or cooperation is needed.\nS:U - The heap corruption occurs in kernel slab memory managed by the same kernel security authority as the calling process; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The controlled slab overflow (up to ~7.6 KB past a kmalloc-2k object) lets the attacker overwrite adjacent kernel objects, and the corrupted CPRB/reply buffer is subsequently parsed and partially copied back to userspace, giving a path to disclosing arbitrary kernel memory.\nI:H - memcpy() writes attacker-chosen token bytes far beyond the 512-byte parameter block, an out-of-bounds heap write with attacker-controlled length and contents, which is a classic primitive for corrupting neighbouring slab objects and hijacking control flow.\nA:H - Overwriting several kilobytes of adjacent slab memory reliably corrupts unrelated kernel objects and slab metadata, causing oopses or a panic; the ioctl can be repeated at will by any local user."
}
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{
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}
],
"title": "s390/zcrypt: Validate length for CCA AES cipher key requests",
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"assignerShortName": "Linux",
"cveId": "CVE-2026-68452",
"datePublished": "2026-08-13T13:59:54.840Z",
"dateReserved": "2026-07-30T09:28:09.395Z",
"dateUpdated": "2026-10-19T21:09:11.097Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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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.