CVE-2026-89698

Local kernel-data disclosure via undersized address fields

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in Linux 6.7 allows local users to disclose kernel request flags through an NFSD netlink status dump. nfsd_genl_rpc_status_compose_msg() casts 16-byte sockaddr fields to 28-byte IPv6 structures, then copies address bytes spanning eight bytes of the adjacent rq_flags field into netlink attributes. Any unprivileged process in the network namespace can reach the dump when an IPv6 NFS client is connected, exposing request-state flags but not arbitrary kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux 6.7 allows local users to disclose kernel request flags through an NFSD netlink status dump. nfsd_genl_rpc_status_compose_msg() casts 16-byte sockaddr fields to 28-byte IPv6 structures, then copies address bytes spanning eight bytes of the adjacent rq_flags field into netlink attributes. Any unprivileged process in the network namespace can reach the dump when an IPv6 NFS client is connected, exposing request-state flags but not arbitrary kernel memory.

The record

CVE
CVE-2026-89698
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
unauthenticated

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=6.7
  2. Affected versionversion=bd9d6a3efa9709e653aafbeb859289feccb8e70c <03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5
  3. Affected versionversion=bd9d6a3efa9709e653aafbeb859289feccb8e70c <a99d720ed2a5258564e5e9d5f39f3184a030d354
  4. Affected versionversion=bd9d6a3efa9709e653aafbeb859289feccb8e70c <dcb69ad0dafb4a24b825183bb94055d5be8a10bd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=bd9d6a3efa9709e653aafbeb859289feccb8e70c <03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5; version=bd9d6a3efa9709e653aafbeb859289feccb8e70c <a99d720ed2a5258564e5e9d5f39f3184a030d354; version=bd9d6a3efa9709e653aafbeb859289feccb8e70c <dcb69ad0dafb4a24b825183bb94055d5be8a10bd

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)
Vectorlocal
Privilegesunauthenticated
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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