CVE-2026-68451 (GCVE-0-2026-68451)
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 ECC private key requests
Summary
In the Linux kernel, the following vulnerability has been resolved:
s390/zcrypt: Validate length for CCA ECC private key requests
cca_ecc2protkey() 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:
fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 7dc306ff7c4d951582adaae65e0aee9fb4968dbe
(git)
Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 447a37a6bef11bfd3645069e380460b11386e2b9 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < f0831f13c42c1261d449dcee8a035e1c6cd9fcaa (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 013a4484f061a2b41f052e25c0015203287e63f1 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 8fa3e9435a13c335efb63fb4f4e77531a0031159 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < a9ae0f6dd45c3ccc1d69363f7aea8af179122730 (git) |
guessed | |
| Linux | Linux |
Affected:
5.10
Unaffected: 0 , < 5.10 (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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{
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},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:49:11.874669Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:49:13.159Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/s390/crypto/zcrypt_ccamisc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7dc306ff7c4d951582adaae65e0aee9fb4968dbe",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "447a37a6bef11bfd3645069e380460b11386e2b9",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "f0831f13c42c1261d449dcee8a035e1c6cd9fcaa",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "013a4484f061a2b41f052e25c0015203287e63f1",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "8fa3e9435a13c335efb63fb4f4e77531a0031159",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
},
{
"lessThan": "a9ae0f6dd45c3ccc1d69363f7aea8af179122730",
"status": "affected",
"version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/s390/crypto/zcrypt_ccamisc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
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},
{
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"versionEndExcluding": "6.12.103",
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},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Validate length for CCA ECC private key requests\n\ncca_ecc2protkey() 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached through the `/dev/pkey` misc device via the PKEY_KBLOB2PROTK/PROTK2/PROTK3 ioctls, requiring local access to the s390 system; there is no remote or network-facing path into cca_ecc2protkey().\nAC:L - The attacker fully controls both the overflow length and the overflowing bytes by crafting the ECC key token\u0027s `len` field and blob contents, and the memcpy executes deterministically on every call with no race, timing, or layout precondition.\nPR:L - The pkey misc device is registered with mode 0666 and pkey_unlocked_ioctl performs no capability check, so any unprivileged local user (or a container/sandbox process with the node visible) can issue the ioctl.\nUI:N - The attacker triggers the overflow entirely from its own ioctl call; no action by another user or administrator is needed.\nS:U - The heap corruption occurs in kernel memory within the same security authority; no VM, IOMMU, or other trust boundary is crossed by the overflow itself.\nC:H - The controlled slab overflow can overwrite adjacent kernel objects (pointers, lengths, credentials) with attacker-chosen data, which is readily leveraged into arbitrary kernel memory disclosure, including protected/secure key material handled by this subsystem.\nI:H - memcpy() writes up to ~7 KB of fully attacker-controlled data past a kmalloc\u0027d CPRB buffer, giving a classic controlled heap out-of-bounds write usable for corrupting neighbouring slab objects and achieving privilege escalation or control-flow hijack.\nA:H - Even without reliable exploitation, the oversized memcpy smashes the slab and neighbouring allocations, causing memory corruption, SLUB/redzone BUG detonations, oops or kernel panic, repeatedly triggerable by an unprivileged user."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:35:48.084Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
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{
"url": "https://git.kernel.org/stable/c/7dc306ff7c4d951582adaae65e0aee9fb4968dbe"
},
{
"url": "https://git.kernel.org/stable/c/447a37a6bef11bfd3645069e380460b11386e2b9"
},
{
"url": "https://git.kernel.org/stable/c/f0831f13c42c1261d449dcee8a035e1c6cd9fcaa"
},
{
"url": "https://git.kernel.org/stable/c/dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e"
},
{
"url": "https://git.kernel.org/stable/c/ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5"
},
{
"url": "https://git.kernel.org/stable/c/013a4484f061a2b41f052e25c0015203287e63f1"
},
{
"url": "https://git.kernel.org/stable/c/8fa3e9435a13c335efb63fb4f4e77531a0031159"
},
{
"url": "https://git.kernel.org/stable/c/a9ae0f6dd45c3ccc1d69363f7aea8af179122730"
}
],
"title": "s390/zcrypt: Validate length for CCA ECC private key requests",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68451",
"datePublished": "2026-08-13T13:59:53.674Z",
"dateReserved": "2026-07-30T09:28:09.395Z",
"dateUpdated": "2026-10-19T21:09:10.945Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.