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CVE-2026-72351

CRITICALCVSS 9.8/10EPSS 0.22%

Last modified

CVE-2026-72351 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.22%

12.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 158b9995d3c87f3b93f5c22df54a12e12a3438b3; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 7c6876ec1b227261b51803f784c7be1b2242a1a0; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 2c4de9988e9ddc760b750d6b6e701c35ff60ad14; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 2a99224c120823987e4d829726f4ecb33e03fc1e; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 61e78679c7c9ca685bff58e4b6348304dc60aafd; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < 4a4a1d41c6e901e773bcf795f562a47fa71f692a; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < f618cbe9b24cd0202004d2db781d5f80ab77037f; >= c1aa8347e73e4092411fbd96cc59531fb7e76d04, < d335dcc6f521571d57117b8deeebc940836e5450
LinuxLinux3.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-72351?
CVE-2026-72351 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72351?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST