CVE-2026-43336 (GCVE-0-2026-43336)
Vulnerability from cvelistv5
Published
2026-05-08 13:31
Modified
2026-05-11 22:22
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
Since the ChaCha permutation is invertible, the local variable
'permuted_state' is sufficient to compute the original 'state', and thus
the key, even after the permutation has been done.
While the kernel is quite inconsistent about zeroizing secrets on the
stack (and some prominent userspace crypto libraries don't bother at all
since it's not guaranteed to work anyway), the kernel does try to do it
as a best practice, especially in cases involving the RNG.
Thus, explicitly zeroize 'permuted_state' before it goes out of scope.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 Version: c08d0e647305c3f8f640010a56c9e4bafb9488d3 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"lib/crypto/chacha-block-generic.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "e90ee961af515a484f091678ce58a4c3f7b73b02",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "b416a4245f04a450c67a13e6d96056c37c5b33fe",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "bd62d9b44464a6c20a34a74068e7a784d0afa04a",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "066c760acead1fb743bae294dbd89f479ae43b9b",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "1d761e5a7340c46479fb2399598f331e4fe2c633",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "1933249263c3a98df79992f61a566476e4163bcc",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "91999af43ca2125e3b2c18fcfc02912ada02efc3",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
},
{
"lessThan": "e5046823f8fa3677341b541a25af2fcb99a5b1e0",
"status": "affected",
"version": "c08d0e647305c3f8f640010a56c9e4bafb9488d3",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"lib/crypto/chacha-block-generic.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"lessThan": "4.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.169",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.253",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.169",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.135",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.82",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.22",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.12",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "4.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/crypto: chacha: Zeroize permuted_state before it leaves scope\n\nSince the ChaCha permutation is invertible, the local variable\n\u0027permuted_state\u0027 is sufficient to compute the original \u0027state\u0027, and thus\nthe key, even after the permutation has been done.\n\nWhile the kernel is quite inconsistent about zeroizing secrets on the\nstack (and some prominent userspace crypto libraries don\u0027t bother at all\nsince it\u0027s not guaranteed to work anyway), the kernel does try to do it\nas a best practice, especially in cases involving the RNG.\n\nThus, explicitly zeroize \u0027permuted_state\u0027 before it goes out of scope."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T22:22:35.963Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02"
},
{
"url": "https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe"
},
{
"url": "https://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a"
},
{
"url": "https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b"
},
{
"url": "https://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633"
},
{
"url": "https://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc"
},
{
"url": "https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3"
},
{
"url": "https://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0"
}
],
"title": "lib/crypto: chacha: Zeroize permuted_state before it leaves scope",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43336",
"datePublished": "2026-05-08T13:31:22.280Z",
"dateReserved": "2026-05-01T14:12:56.002Z",
"dateUpdated": "2026-05-11T22:22:35.963Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…