CVE-2026-72351 in the critical feed json
gue: validate REMCSUM private option length
published 2mo ago modified 26d ago also EUVD-2026-59250
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
- linux Debian 12 6.1.180-1
- linux Debian 13 6.12.100-1
- linux Debian 14 7.1.5-1
debian advisories DEBIAN-CVE-2026-72351
- linux Ubuntu 22.04 LTS 5.15.0-198.208
- linux Ubuntu 24.04 LTS 6.8.0-147.147
- linux Ubuntu 26.04 LTS 7.0.0-34.34
- linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
- linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
- linux-aws Ubuntu 26.04 LTS 7.0.0-1013.13
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
ubuntu advisories UBUNTU-CVE-2026-72351
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
- kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
- kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1.150700.17.47.1
suse advisories SUSE-SU-2026:4706-1SUSE-SU-2026:4687-1SUSE-SU-2026:4668-1SUSE-SU-2026:4667-1SUSE-SU-2026:4666-1SUSE-SU-2026:4665-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.39.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-azure openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.39.1
opensuse advisories openSUSE-SU-2026:22091-1
- git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3 commit
- git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0 commit
- git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14 commit
- git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e commit
- git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd commit
- git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a commit
- git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f commit
- git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450 commit
Is CVE-2026-72351 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-72351 updated cvss 7.0
kernel: gue: validate REMCSUM private option length
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 26d ago
Exploit prediction
0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3
- git.kernel.org /stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0
- git.kernel.org /stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14
- git.kernel.org /stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e
- git.kernel.org /stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd
- git.kernel.org /stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a
- git.kernel.org /stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f
- git.kernel.org /stable/c/d335dcc6f521571d57117b8deeebc940836e5450
Sources
- CVE List CVE-2026-72351
- NVD CVE-2026-72351
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.