CVE-2026-99999
ipv4: validate checksum_start before completing checksum
CVSS Score
9.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
f43798c27684ab925adde7d8acc34c78c6e50df8 < a464d950f31c89565cbaae038cc60db04fe01956 f43798c27684ab925adde7d8acc34c78c6e50df8 < 0fab003ef4698e0628060a45a48f14b43ba2a40a f43798c27684ab925adde7d8acc34c78c6e50df8 < 94524b7b32691de2e2ce162c04d6cbc9106e5cbf f43798c27684ab925adde7d8acc34c78c6e50df8 < a65f69e0f38ffbed1b128029e09097436416dc8b f43798c27684ab925adde7d8acc34c78c6e50df8 < 32a8b0adaa18e52aaa0b246b5ffe683075354dbb f43798c27684ab925adde7d8acc34c78c6e50df8 < f3e835af6226f1dd12160cbd696081e9b6155de0 f43798c27684ab925adde7d8acc34c78c6e50df8 < c3e33464746166264334641dc850a36eef7e6326 f43798c27684ab925adde7d8acc34c78c6e50df8 < 6785011f8b16abf40b1e9d8b2e332232b3e68822
Linux / Linux
2.6.27
References
git.kernel.org: https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956 git.kernel.org: https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a git.kernel.org: https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf git.kernel.org: https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b git.kernel.org: https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb git.kernel.org: https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0 git.kernel.org: https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326 git.kernel.org: https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822 pwn.ai: https://pwn.ai/blog/Pwnescape vercel.com: https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challenge