CVE-2026-43383 (GCVE-0-2026-43383)
Vulnerability from cvelistv5
Published
2026-05-08 14:21
Modified
2026-05-11 22:23
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/tcp-md5: Fix MAC comparison to be constant-time
To prevent timing attacks, MACs need to be compared in constant
time. Use the appropriate helper function for this.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc Version: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv4/Kconfig",
"net/ipv4/tcp.c",
"net/ipv4/tcp_ipv4.c",
"net/ipv6/tcp_ipv6.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "821c8751fdeecdeecabeb11704dd33439c9e4bbc",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
"lessThan": "345a9530756528d7ca407663d659c3c40e75c3dd",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
"lessThan": "5d305a95130a8d08b9545e47f1e18d29d59866cb",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
"lessThan": "02669e2a4d207068edce7e8b5fafd85822018ce6",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
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"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
"lessThan": "b502e97e29d791ff7a8051f29a414535739be218",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
},
{
"lessThan": "46d0d6f50dab706637f4c18a470aac20a21900d3",
"status": "affected",
"version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/Kconfig",
"net/ipv4/tcp.c",
"net/ipv4/tcp_ipv4.c",
"net/ipv6/tcp_ipv6.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.20"
},
{
"lessThan": "2.6.20",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"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": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.167",
"versionStartIncluding": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.130",
"versionStartIncluding": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.78",
"versionStartIncluding": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.19",
"versionStartIncluding": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.9",
"versionStartIncluding": "2.6.20",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "2.6.20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tcp-md5: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant\ntime. Use the appropriate helper function for this."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.4,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T22:23:31.624Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc"
},
{
"url": "https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd"
},
{
"url": "https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb"
},
{
"url": "https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6"
},
{
"url": "https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624"
},
{
"url": "https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218"
},
{
"url": "https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3"
}
],
"title": "net/tcp-md5: Fix MAC comparison to be constant-time",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43383",
"datePublished": "2026-05-08T14:21:30.704Z",
"dateReserved": "2026-05-01T14:12:56.006Z",
"dateUpdated": "2026-05-11T22:23:31.624Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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.
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