CVE-2026-99999

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Source

https://cve.org/CVERecord?id=CVE-2026-99999

Import Source

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-99999

Downstream

Published

2026-10-15T12:19:22Z

Modified

2026-10-16T02:47:23Z

Severity

9.3 (Critical) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator

Summary

ipv4: validate checksum_start before completing checksum

Details

In the Linux kernel, the following vulnerability has been resolved:

ipv4: validate checksum_start before completing checksum

If a packet with bad checksum metadata gets into the ipv4 stack, skb_checksum_help can corrupt the network header and cause a bunch of mischief.

This was discovered and reported by Paulos, and has been reporoduced by others independently since.

We really shouldn't allow such packets in, but as a defence in depth measure, let's also check before we complete the checksum.

A more complete validation at input is forthcoming, but needs more work.

Database specific

{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99999.json"
}

References

Affected packages

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

f43798c27684ab925adde7d8acc34c78c6e50df8

Fixed

a464d950f31c89565cbaae038cc60db04fe01956

Fixed

0fab003ef4698e0628060a45a48f14b43ba2a40a

Fixed

94524b7b32691de2e2ce162c04d6cbc9106e5cbf

Fixed

a65f69e0f38ffbed1b128029e09097436416dc8b

Fixed

32a8b0adaa18e52aaa0b246b5ffe683075354dbb

Fixed

f3e835af6226f1dd12160cbd696081e9b6155de0

Fixed

c3e33464746166264334641dc850a36eef7e6326

Fixed

6785011f8b16abf40b1e9d8b2e332232b3e68822

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99999.json"

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99999.json"