CVE-2026-72351

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 158b9995d3c87f3b93f5c22df54a12e12a3438b3affected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 7c6876ec1b227261b51803f784c7be1b2242a1a0affected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2c4de9988e9ddc760b750d6b6e701c35ff60ad14affected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 2a99224c120823987e4d829726f4ecb33e03fc1eaffected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 61e78679c7c9ca685bff58e4b6348304dc60aafdaffected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < 4a4a1d41c6e901e773bcf795f562a47fa71f692aaffected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < f618cbe9b24cd0202004d2db781d5f80ab77037faffected
LinuxLinuxc1aa8347e73e4092411fbd96cc59531fb7e76d04 < d335dcc6f521571d57117b8deeebc940836e5450affected
LinuxLinux3.19affected
LinuxLinux0 < 3.19unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References