CVE-2026-89743Hinoki check available

Kernel heap disclosure via unbounded NSM response length

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in the Linux kernel NSM driver allows attackers controlling the device backend to disclose kernel heap data. nsm_sendrecv_msg_locked() trusts the virtqueue used-ring length, and parse_resp_raw() copies that length from a fixed response buffer to user space. Exploitation requires a malicious or buggy NSM backend; exposed bytes can include unrelated adjacent kernel heap contents.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds read in the Linux kernel NSM driver allows attackers controlling the device backend to disclose kernel heap data. nsm_sendrecv_msg_locked() trusts the virtqueue used-ring length, and parse_resp_raw() copies that length from a fixed response buffer to user space. Exploitation requires a malicious or buggy NSM backend; exposed bytes can include unrelated adjacent kernel heap contents.

The record

CVE
CVE-2026-89743
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.8
  2. Affected versionversion=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <29e634a18957acda11383a15ab98a91c4ae9e294
  3. Affected versionversion=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <2aa0fb9c96f894a9c179a48e7522ea6705800adf
  4. Affected versionversion=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <339f19b9a6171289b0e797deb8bda80b9a1fcc30
  5. Affected versionversion=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <808e530654a5354e6df78863a5d61e4d44e67235

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <29e634a18957acda11383a15ab98a91c4ae9e294; version=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <2aa0fb9c96f894a9c179a48e7522ea6705800adf; version=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <339f19b9a6171289b0e797deb8bda80b9a1fcc30; version=b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <808e530654a5354e6df78863a5d61e4d44e67235

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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