Riskcovery

CVE-2026-99999

ipv4: validate checksum_start before completing checksum

State
Published
Severity
9.3 Critical
Published
Oct 15, 2026
Updated
Oct 24, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.19.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

  • CWE-20 Improper Input Validation

Affected Products

ProductVersions
LinuxLinux
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before a464d950f31c89565cbaae038cc60db04fe01956Affected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before 0fab003ef4698e0628060a45a48f14b43ba2a40aAffected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before 94524b7b32691de2e2ce162c04d6cbc9106e5cbfAffected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before a65f69e0f38ffbed1b128029e09097436416dc8bAffected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before 32a8b0adaa18e52aaa0b246b5ffe683075354dbbAffected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before f3e835af6226f1dd12160cbd696081e9b6155de0Affected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before c3e33464746166264334641dc850a36eef7e6326Affected
  • f43798c27684ab925adde7d8acc34c78c6e50df8 to before 6785011f8b16abf40b1e9d8b2e332232b3e68822Affected
LinuxLinux
  • 2.6.27Affected
  • before 2.6.27Not affected
  • 5.10.272 through 5.10.*Not affected
  • 5.15.223 through 5.15.*Not affected
  • 6.1.190 through 6.1.*Not affected
  • 6.6.159 through 6.6.*Not affected
  • 6.12.113 through 6.12.*Not affected
  • 6.18.57 through 6.18.*Not affected
  • 7.2.11 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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