CVE-2026-72351

gue: validate REMCSUM private option length

State: Published
Severity: 9.8 Critical
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 158b9995d3c87f3b93f5c22df54a12e12a3438b3Affected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 7c6876ec1b227261b51803f784c7be1b2242a1a0Affected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 2c4de9988e9ddc760b750d6b6e701c35ff60ad14Affected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 2a99224c120823987e4d829726f4ecb33e03fc1eAffected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 61e78679c7c9ca685bff58e4b6348304dc60aafdAffected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 4a4a1d41c6e901e773bcf795f562a47fa71f692aAffected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before f618cbe9b24cd0202004d2db781d5f80ab77037fAffected c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before d335dcc6f521571d57117b8deeebc940836e5450Affected
LinuxLinux	3.19Affected before 3.19Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 158b9995d3c87f3b93f5c22df54a12e12a3438b3Affected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 7c6876ec1b227261b51803f784c7be1b2242a1a0Affected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 2c4de9988e9ddc760b750d6b6e701c35ff60ad14Affected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 2a99224c120823987e4d829726f4ecb33e03fc1eAffected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 61e78679c7c9ca685bff58e4b6348304dc60aafdAffected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before 4a4a1d41c6e901e773bcf795f562a47fa71f692aAffected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before f618cbe9b24cd0202004d2db781d5f80ab77037fAffected
c1aa8347e73e4092411fbd96cc59531fb7e76d04 to before d335dcc6f521571d57117b8deeebc940836e5450Affected

LinuxLinux

3.19Affected
before 3.19Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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