CVE-2026-99999Critical· 9.3▾ MidnightIn 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 hea…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 51.2 · likelihood 0 · exploitation 0
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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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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