Linux Kernel up to 6.12.108/6.18.49/7.2.3 nvme-tcp nvme_tcp_handle_r2t information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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2.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.12.108/6.18.49/7.2.3 and classified as problematic. This affects the function nvme_tcp_handle_r2t of the component nvme-tcp. This manipulation causes information disclosure. This vulnerability is handled as CVE-2026-89481. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.108/6.18.49/7.2.3. It has been declared as problematic. Affected by this vulnerability is the function nvme_tcp_handle_r2t of the component nvme-tcp. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix host memory disclosure on R2T for a read command nvme_tcp_handle_r2t() does not check the direction of the request the R2T refers to. A malicious controller can send an R2T for a READ and the host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the H2CData header and nvme_tcp_try_send_data() sends the request's data buffer. That buffer is the READ destination, so its contents go to the controller. The command then completes normally and nothing is logged. Against a test controller that answers every READ with an R2T, a 4096 byte buffered read returned all 4096 bytes, split over two R2Ts. The pages contained stale kernel data, including an array of struct page pointers. Reject an R2T for a request that is not a write.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-89481 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation needs additional levels of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 345433 (Linux Distros Unpatched Vulnerability : CVE-2026-89481), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.109, 6.18.50, 7.2.4 or 7.3-rc1 eliminates this vulnerability. Applying the patch a4c3c7310156493797c920b10d8648c07aa05403/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5/6efbc52237facda35d2d874fe1765bb4839275d8 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (345433). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.7
VulDB Meta Temp Score: 2.6

VulDB Base Score: 2.7
VulDB Temp Score: 2.6
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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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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Nessus ID: 345433
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-89481

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.109/6.18.50/7.2.4/7.3-rc1
Patch: a4c3c7310156493797c920b10d8648c07aa05403/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5/6efbc52237facda35d2d874fe1765bb4839275d8

Timelineinfo

09/11/2026 CVE reserved
09/11/2026 +0 days VulDB entry created
09/12/2026 +0 days Advisory disclosed
09/13/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CNA: Linux
CVE: CVE-2026-89481 (🔒)

GCVE (CVE): GCVE-0-2026-89481
GCVE (VulDB): GCVE-100-402811

Entryinfo

Created: 09/12/2026 00:48
Updated: 09/13/2026 06:42
Changes: 09/12/2026 00:48 (59), 09/13/2026 06:42 (2)
Complete: 🔍
Cache ID: 216::103

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