{"id":"CVE-2026-99999","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network hea…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network hea…","severity":"critical","cvss":9.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < a464d950f31c89565cbaae038cc60db04fe01956","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < 0fab003ef4698e0628060a45a48f14b43ba2a40a","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < 94524b7b32691de2e2ce162c04d6cbc9106e5cbf","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < a65f69e0f38ffbed1b128029e09097436416dc8b","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < 32a8b0adaa18e52aaa0b246b5ffe683075354dbb","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < f3e835af6226f1dd12160cbd696081e9b6155de0","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < c3e33464746166264334641dc850a36eef7e6326","Linux >= f43798c27684ab925adde7d8acc34c78c6e50df8 < 6785011f8b16abf40b1e9d8b2e332232b3e68822","Linux 2.6.27"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T13:17:14.137","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-99999","references":[{"url":"https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://pwn.ai/blog/Pwnescape","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challenge","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T13:06:33.282Z","slug":"CVE-2026-99999","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipv4: validate checksum_start before completing checksum\n\nIf a packet with bad checksum metadata gets into the ipv4 stack,\nskb_checksum_help can corrupt the network header and cause a bunch of\nmischief.\n\nThis was discovered and reported by Paulos, and has been reporoduced\nby others independently since.\n\nWe really shouldn't allow such packets in, but as a defence\nin depth measure, let's also check before we complete the checksum.\n\nA more complete validation at input is forthcoming, but needs more work.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":51.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}