Linux Kernel up to 7.2.0 nvmet-auth nvmet_execute_auth_receive uninitialized pointer

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 7.2.0. The affected element is the function nvmet_execute_auth_receive of the component nvmet-auth. Executing a manipulation can lead to uninitialized pointer. This vulnerability is tracked as CVE-2026-80791. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.0. It has been declared as problematic. This vulnerability affects the function nvmet_execute_auth_receive of the component nvmet-auth. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. The CWE definition for the vulnerability is CWE-824. The product accesses or uses a pointer that has not been initialized. As an impact it is known to affect confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: zero the AUTH_RECEIVE response buffer nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake. Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-80791 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/04/2026).

Upgrading to version 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch 447b668faa14710f611e714031e3739ac3ec3a4f/8f6363c8d54dde95982f0ab45e77cf57ec0efd62/dfcf013f77709ebdb282767edc2795a37cab5b57/b26189d28442183a8b5edb754f4a6918f77ca84e/2dcc9226203da7275a9c29d20007da278d73d5e9/1d6837d98bf966a041af65de5f78de7409ff83bc/3ddcfb013322aa37eaa7a0d344b73079c38dfa21 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: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: Uninitialized pointer
CWE: CWE-824 / CWE-908
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 6.1.185/6.6.154/6.12.106/6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: 447b668faa14710f611e714031e3739ac3ec3a4f/8f6363c8d54dde95982f0ab45e77cf57ec0efd62/dfcf013f77709ebdb282767edc2795a37cab5b57/b26189d28442183a8b5edb754f4a6918f77ca84e/2dcc9226203da7275a9c29d20007da278d73d5e9/1d6837d98bf966a041af65de5f78de7409ff83bc/3ddcfb013322aa37eaa7a0d344b73079c38dfa21

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80791 (🔒)
GCVE (CVE): GCVE-0-2026-80791
GCVE (VulDB): GCVE-100-398932

Entryinfo

Created: 09/04/2026 18:23
Changes: 09/04/2026 18:23 (59)
Complete: 🔍
Cache ID: 216::103

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