Linux Kernel up to 7.2-rc2 GUE guehdr_priv_flags_len input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.47+

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 7.2-rc2. This vulnerability affects the function guehdr_priv_flags_len of the component GUE. Such manipulation leads to input validation. This vulnerability is traded as CVE-2026-72351. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been rated as very critical. Affected by this issue is the function guehdr_priv_flags_len of the component GUE. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-72351 since 08/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc3 eliminates this vulnerability. Applying the patch 158b9995d3c87f3b93f5c22df54a12e12a3438b3/7c6876ec1b227261b51803f784c7be1b2242a1a0/2c4de9988e9ddc760b750d6b6e701c35ff60ad14/2a99224c120823987e4d829726f4ecb33e03fc1e/61e78679c7c9ca685bff58e4b6348304dc60aafd/4a4a1d41c6e901e773bcf795f562a47fa71f692a/f618cbe9b24cd0202004d2db781d5f80ab77037f/d335dcc6f521571d57117b8deeebc940836e5450 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc3
Patch: 158b9995d3c87f3b93f5c22df54a12e12a3438b3/7c6876ec1b227261b51803f784c7be1b2242a1a0/2c4de9988e9ddc760b750d6b6e701c35ff60ad14/2a99224c120823987e4d829726f4ecb33e03fc1e/61e78679c7c9ca685bff58e4b6348304dc60aafd/4a4a1d41c6e901e773bcf795f562a47fa71f692a/f618cbe9b24cd0202004d2db781d5f80ab77037f/d335dcc6f521571d57117b8deeebc940836e5450

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72351 (🔒)
GCVE (CVE): GCVE-0-2026-72351
GCVE (VulDB): GCVE-100-390734

Entryinfo

Created: 08/15/2026 14:34
Changes: 08/15/2026 14:34 (59)
Complete: 🔍
Cache ID: 216::103

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