9.8
CRITICAL
CVSS 3.1
CVE-2026-72351
gue: validate REMCSUM private option length
Overview
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.
Details
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
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for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Validate GUE REMCSUM private option length to prevent malformed packet processing.
- Apply kernel patch for GUE REMCSUM validation.
- Ensure kernel option validation is correctly implemented.
- Update kernel to a version with the fix.
- Reject malformed GUE packets.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72351.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72351 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72351
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72351 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72351 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '158b9995d3c87f3b93f5c22df54a12e12a3438b3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '7c6876ec1b227261b51803f784c7be1b2242a1a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2c4de9988e9ddc760b750d6b6e701c35ff60ad14', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2a99224c120823987e4d829726f4ecb33e03fc1e', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '61e78679c7c9ca685bff58e4b6348304dc60aafd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '4a4a1d41c6e901e773bcf795f562a47fa71f692a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'f618cbe9b24cd0202004d2db781d5f80ab77037f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'd335dcc6f521571d57117b8deeebc940836e5450', 'versionType': 'git'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '158b9995d3c87f3b93f5c22df54a12e12a3438b3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '7c6876ec1b227261b51803f784c7be1b2242a1a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2c4de9988e9ddc760b750d6b6e701c35ff60ad14', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2a99224c120823987e4d829726f4ecb33e03fc1e', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '61e78679c7c9ca685bff58e4b6348304dc60aafd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '4a4a1d41c6e901e773bcf795f562a47fa71f692a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'f618cbe9b24cd0202004d2db781d5f80ab77037f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'd335dcc6f521571d57117b8deeebc940836e5450', 'versionType': 'git'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '158b9995d3c87f3b93f5c22df54a12e12a3438b3', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '7c6876ec1b227261b51803f784c7be1b2242a1a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2c4de9988e9ddc760b750d6b6e701c35ff60ad14', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '2a99224c120823987e4d829726f4ecb33e03fc1e', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '61e78679c7c9ca685bff58e4b6348304dc60aafd', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': '4a4a1d41c6e901e773bcf795f562a47fa71f692a', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'f618cbe9b24cd0202004d2db781d5f80ab77037f', 'versionType': 'git'}, {'status': 'affected', 'version': 'c1aa8347e73e4092411fbd96cc59531fb7e76d04', 'lessThan': 'd335dcc6f521571d57117b8deeebc940836e5450', 'versionType': 'git'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['include/net/gue.h'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3 Added Reference https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e Added Reference https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14 Added Reference https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a Added Reference https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd Added Reference https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0 Added Reference https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450 Added Reference https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.