Answer in brief
CVE-2026-43383 records a Critical severity (CVSS 9.4) vulnerability in net/tcp-md5: Fix MAC comparison to be constant-time. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-43383 records a Critical severity (CVSS 9.4) vulnerability in net/tcp-md5: Fix MAC comparison to be constant-time. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <821c8751fdeecdeecabeb11704dd33439c9e4bbc || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <ff44ec94d4fc8348600a69de0a8fa1102c23bce8 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <345a9530756528d7ca407663d659c3c40e75c3dd || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <5d305a95130a8d08b9545e47f1e18d29d59866cb || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <02669e2a4d207068edce7e8b5fafd85822018ce6 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <ae3831b44f477de048287493e184fc3ff913b624 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <b502e97e29d791ff7a8051f29a414535739be218 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <46d0d6f50dab706637f4c18a470aac20a21900d3 | 821c8751fdeecdeecabeb11704dd33439c9e4bbc, ff44ec94d4fc8348600a69de0a8fa1102c23bce8, 345a9530756528d7ca407663d659c3c40e75c3dd, 5d305a95130a8d08b9545e47f1e18d29d59866cb, 02669e2a4d207068edce7e8b5fafd85822018ce6, ae3831b44f477de048287493e184fc3ff913b624, b502e97e29d791ff7a8051f29a414535739be218, 46d0d6f50dab706637f4c18a470aac20a21900d3 |
| Linux/Linuxgeneric | 2.6.20 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <821c8751fdeecdeecabeb11704dd33439c9e4bbc || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <ff44ec94d4fc8348600a69de0a8fa1102c23bce8 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <345a9530756528d7ca407663d659c3c40e75c3dd || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <5d305a95130a8d08b9545e47f1e18d29d59866cb || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <02669e2a4d207068edce7e8b5fafd85822018ce6 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <ae3831b44f477de048287493e184fc3ff913b624 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <b502e97e29d791ff7a8051f29a414535739be218 || >=cfb6eeb4c860592edd123fdea908d23c6ad1c7dc <46d0d6f50dab706637f4c18a470aac20a21900d3 | 821c8751fdeecdeecabeb11704dd33439c9e4bbc, ff44ec94d4fc8348600a69de0a8fa1102c23bce8, 345a9530756528d7ca407663d659c3c40e75c3dd, 5d305a95130a8d08b9545e47f1e18d29d59866cb, 02669e2a4d207068edce7e8b5fafd85822018ce6, ae3831b44f477de048287493e184fc3ff913b624, b502e97e29d791ff7a8051f29a414535739be218, 46d0d6f50dab706637f4c18a470aac20a21900d3 |
| Linux/Linuxgeneric | 2.6.20 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
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.
Quoted source text, attributed separately from HOL analysis.