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CVE record · CVE-2026-99999

ipv4: validate checksum_start before completing checksum

CVSS 9.3 CriticalCriticalEPSS 0.0079 · 56th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: Linux) at 15 Oct 2026, 12:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Linux Linux
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before a464d950f31c89565cbaae038cc60db04fe01956 git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before 0fab003ef4698e0628060a45a48f14b43ba2a40a git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before 94524b7b32691de2e2ce162c04d6cbc9106e5cbf git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before a65f69e0f38ffbed1b128029e09097436416dc8b git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before 32a8b0adaa18e52aaa0b246b5ffe683075354dbb git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before f3e835af6226f1dd12160cbd696081e9b6155de0 git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before c3e33464746166264334641dc850a36eef7e6326 git
  • affected f43798c27684ab925adde7d8acc34c78c6e50df8 to before 6785011f8b16abf40b1e9d8b2e332232b3e68822 git
Other versions: unaffected
Linux Linux
  • affected 2.6.27
  • unaffected before 2.6.27 semver
  • unaffected 5.10.272 to 5.10.*, inclusive semver
  • unaffected 5.15.223 to 5.15.*, inclusive semver
  • unaffected 6.1.190 to 6.1.*, inclusive semver
  • unaffected 6.6.159 to 6.6.*, inclusive semver
  • unaffected 6.12.113 to 6.12.*, inclusive semver
  • unaffected 6.18.57 to 6.18.*, inclusive semver
  • unaffected 7.2.11 to 7.2.*, inclusive semver
  • unaffected 7.3 to *, inclusive original_commit_for_fix
Other versions: affected
Identifiers
CVE-2026-99999
CNA
Linux
Weakness (CWE)
CWE-20
Tags
Published
15 Oct 2026
Updated
24 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (Linux)
  • CISA KEV Not listed.
  • EPSS 0.0079, the 56th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 15 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.