Critical 9.8Published Aug 15, 2026

CVE-2026-72351gue: validate REMCSUM private option length

Updated under an hour ago (Oct 28, 2026, 1:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 158b9995d3c87f3b93f5c22df54a12e12a3438b3; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 7c6876ec1b227261b51803f784c7be1b2242a1a0; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 2c4de9988e9ddc760b750d6b6e701c35ff60ad14; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 2a99224c120823987e4d829726f4ecb33e03fc1e; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 61e78679c7c9ca685bff58e4b6348304dc60aafd; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before 4a4a1d41c6e901e773bcf795f562a47fa71f692a; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before f618cbe9b24cd0202004d2db781d5f80ab77037f; from c1aa8347e73e4092411fbd96cc59531fb7e76d04 before d335dcc6f521571d57117b8deeebc940836e5450	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.