Linux Kernel up to 6.12.100/6.18.39/7.1.4 nvmet-auth nvmet_execute_auth_receive out-of-bounds write

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-$25k1.51-

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.100/6.18.39/7.1.4 and classified as very critical. Impacted is the function nvmet_execute_auth_receive of the component nvmet-auth. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2026-72130. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.100/6.18.39/7.1.4 and classified as very critical. This vulnerability affects the function nvmet_execute_auth_receive of the component nvmet-auth. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: reject short AUTH_RECEIVE buffers nvmet_execute_auth_receive() trusts the AUTH_RECEIVE allocation length after checking only that it is nonzero and matches the transfer length. In the SUCCESS1 and FAILURE1/default states, that lets a remote NVMe-oF initiator reach the fixed-size DH-HMAC-CHAP response builders with a kmalloc() buffer shorter than the response, so nvmet_auth_success1() and nvmet_auth_failure1() write past the allocation; both only WARN_ON the short length and then format the message anyway. Impact: A remote NVMe-oF initiator with access to an auth-enabled target can trigger a 16-byte heap out-of-bounds write via a one-byte AUTH_RECEIVE allocation length. Compute the minimum response length for the current DH-HMAC-CHAP step in nvmet_auth_receive_data_len() and report a zero data length when the host-supplied allocation length is shorter, so the existing zero-length check in nvmet_execute_auth_receive() rejects the command before any builder runs. The SUCCESS1 minimum is sizeof(struct nvmf_auth_dhchap_success1_data) plus the HMAC hash length, because the response hash is written into the rval[] flexible-array tail, so the minimum is state dependent rather than a flat sizeof. CHALLENGE keeps its existing variable-length guard in nvmet_auth_challenge(). This is reachable only when in-band DH-HMAC-CHAP authentication is configured on the target.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-72130 since 08/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/15/2026).

Upgrading to version 6.12.101, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 80bf7b7f676e3987bbe06af3c359bd56ac91a5a9/2eaa3ad450141cfcf187bb43cb8335eb336b5f87/bc111698b46e43eddd8664cceaa621cd559e99a0/779575bc35c687697ba69e904f2cd22e60112534 is able to eliminate this problem.

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Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
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: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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 6.12.101/6.18.40/7.1.5/7.2-rc1
Patch: 80bf7b7f676e3987bbe06af3c359bd56ac91a5a9/2eaa3ad450141cfcf187bb43cb8335eb336b5f87/bc111698b46e43eddd8664cceaa621cd559e99a0/779575bc35c687697ba69e904f2cd22e60112534

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-2026-72130 (🔒)
GCVE (CVE): GCVE-0-2026-72130
GCVE (VulDB): GCVE-100-390604

Entryinfo

Created: 08/15/2026 13:14
Changes: 08/15/2026 13:14 (59)
Complete: 🔍
Cache ID: 216::103

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