CVE-2026-43383 (GCVE-0-2026-43383)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-08-05 12:27
VLAI
Title
net/tcp-md5: Fix MAC comparison to be constant-time
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.
Severity
9.4 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < 821c8751fdeecdeecabeb11704dd33439c9e4bbc (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < ff44ec94d4fc8348600a69de0a8fa1102c23bce8 (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < 345a9530756528d7ca407663d659c3c40e75c3dd (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < 5d305a95130a8d08b9545e47f1e18d29d59866cb (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < 02669e2a4d207068edce7e8b5fafd85822018ce6 (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < ae3831b44f477de048287493e184fc3ff913b624 (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < b502e97e29d791ff7a8051f29a414535739be218 (git)
Affected: cfb6eeb4c860592edd123fdea908d23c6ad1c7dc , < 46d0d6f50dab706637f4c18a470aac20a21900d3 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.20
Unaffected: 0 , < 2.6.20 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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Use the appropriate helper function for 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-03T14:57:59+00:00",
      "cve": "CVE-2026-43383",
      "id": "CVE-2026-43383",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/tcp-md5: Fix MAC comparison to be constant-time",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43383.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-24T16:27:00Z",
      "cve": "CVE-2026-43383",
      "id": "CVE-2026-43383",
      "initial_release_date": "2026-05-11T14:13:53Z",
      "product_status:first_fixed": "55",
      "product_status:known_affected": "622",
      "product_status:recommended": "197",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43383",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43383.json",
      "version": "11"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.