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Critical

net/tcp-md5: Fix MAC comparison to be constant-time

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-43383

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43383

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "821c8751fdeecdeecabeb11704dd33439c9e4bbc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "ff44ec94d4fc8348600a69de0a8fa1102c23bce8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "345a9530756528d7ca407663d659c3c40e75c3dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "5d305a95130a8d08b9545e47f1e18d29d59866cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "02669e2a4d207068edce7e8b5fafd85822018ce6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "ae3831b44f477de048287493e184fc3ff913b624",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "b502e97e29d791ff7a8051f29a414535739be218",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "cfb6eeb4c860592edd123fdea908d23c6ad1c7dc",
        "lessThan": "46d0d6f50dab706637f4c18a470aac20a21900d3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/Kconfig",
      "net/ipv4/tcp.c",
      "net/ipv4/tcp_ipv4.c",
      "net/ipv6/tcp_ipv6.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.20"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.20",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.9",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/Kconfig",
      "net/ipv4/tcp.c",
      "net/ipv4/tcp_ipv4.c",
      "net/ipv6/tcp_ipv6.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43383

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40070 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement