CVE-2026-72351

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3
https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e
https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14
https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a
https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd
https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0
https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450
https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:22

Updated : 2026-08-17 06:18

NVD link : CVE-2026-72351

Mitre link : CVE-2026-72351

CVE.ORG link : CVE-2026-72351

JSON object : View

Products Affected

No product.

CWE

No CWE.

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The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\n\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\n\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation."}], "lastModified": "2026-08-17T06:18:39.157", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}