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CVE-2026-72351

gue: validate REMCSUM private option length

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: gue: validate REMCSUM private option length GUE private flags can indicate that remote checksum offload metadata is present. The private flags field itself is accounted for by guehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even when GUE_PFLAG_REMCSUM is set. This lets a packet with only the private flags field pass validate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum() read the missing REMCSUM start/offset fields from the following bytes. Account for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that malformed packets are rejected during option validation.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 158b9995d3c87f3b93f5c22df54a12e12a3438b3; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 7c6876ec1b227261b51803f784c7be1b2242a1a0; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 2c4de9988e9ddc760b750d6b6e701c35ff60ad14; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 2a99224c120823987e4d829726f4ecb33e03fc1e; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 61e78679c7c9ca685bff58e4b6348304dc60aafd; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in 4a4a1d41c6e901e773bcf795f562a47fa71f692a; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in f618cbe9b24cd0202004d2db781d5f80ab77037f; From c1aa8347e73e4092411fbd96cc59531fb7e76d04 · fixed in d335dcc6f521571d57117b8deeebc940836e5450

  • Linux Linux

    3.19

  • KernelLinux

    From 3.19.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org