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 Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel-modules-extraUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade python3-perf-debuginfoUpgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-develUpgrade kernel-modules-extra-commonUpgrade kernel-toolsUpgrade kernel-livepatch-6.1.180-225.360Upgrade kernel-debuginfo-common-x86_64 | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 16, 2026 | Aug 16, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 27, 2026 | Aug 15, 2026 |
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