CVE-2026-72351
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
In the Linux kernel, the GUE module has a vulnerability due to missing validation of the REMCSUM private option length. guehdr_priv_flags_len() returns 0 even when GUE_PFLAG_REMCSUM is set, allowing malformed packets to pass and read missing fields from subsequent bytes.
Risk Assessment
The risk includes processing of malicious packets, which could lead to checksum offload errors or system crashes.
Recommendation
Apply the patch that accounts for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present to reject malformed packets during option validation.
Original NVD description (English source)
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.