CVE-2026-46124Network attack vector

Authenticated block-device disclosure via unbounded NFS handle

Published May 28, 2026 · Updated May 28, 2026

Information disclosure in Linux Kernel isofs allows remote authenticated users to read unrelated block-device data through NFS metadata. isofs_export_iget accepts an attacker-controlled block number from an NFS file handle and reads any in-range block as an iso_directory_record without checking s_nzones. The exposure requires an isofs filesystem exported over NFS from a loop-mounted image and an authenticated NFS peer; leaked bytes are limited to dentry metadata, with no memory-safety or integrity impact.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Linux Kernel isofs allows remote authenticated users to read unrelated block-device data through NFS metadata. isofs_export_iget accepts an attacker-controlled block number from an NFS file handle and reads any in-range block as an iso_directory_record without checking s_nzones. The exposure requires an isofs filesystem exported over NFS from a loop-mounted image and an authenticated NFS peer; leaked bytes are limited to dentry metadata, with no memory-safety or integrity impact.

The record

CVE
CVE-2026-46124
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=007124c896e7d4614ac1f6bd4dedb975c35a2a8e
  2. Affected versionversion=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <24376458138387fb251e782e624c7776e9826796
  3. Affected versionversion=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6
  4. Affected versionversion=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b
  5. Affected versionversion=0fdafdaef796816a9ed0fd7ac812932d569d9beb
  6. Affected versionversion=5.10.237 <5.11
  7. Affected versionversion=5.15.181 <5.16
  8. Affected versionversion=5.4.293 <5.5
  9. Affected versionversion=56dfffea9fd3be0b3795a9ca6401e133a8427e0b <0a1af74ae2177bda3aee0837a0546309aa539d0d
  10. Affected versionversion=5e7de55602c61c8ff28db075cc49c8dd6989d7e0
  11. Affected versionversion=6.1.135 <6.2
  12. Affected versionversion=6.12.25 <6.12.88
  13. Affected versionversion=6.14.4 <6.15
  14. Affected versionversion=6.15
  15. Affected versionversion=63d5a3e207bf315a32c7d16de6c89753a759f95a
  16. Affected versionversion=6.6.88 <6.6.140
  17. Affected versionversion=952e7a7e317f126d0a2b879fc531b716932d5ffa <bb0988ed4f2e26d59bbb58f644cb3a55b7521e21
  18. Affected versionversion=ee01a309ebf598be1ff8174901ed6e91619f1749

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=007124c896e7d4614ac1f6bd4dedb975c35a2a8e; version=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <24376458138387fb251e782e624c7776e9826796; version=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6; version=0405d4b63d082861f4eaff9d39c78ee9dc34f845 <afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b; version=0fdafdaef796816a9ed0fd7ac812932d569d9beb; version=5.10.237 <5.11; version=5.15.181 <5.16; version=5.4.293 <5.5; version=56dfffea9fd3be0b3795a9ca6401e133a8427e0b <0a1af74ae2177bda3aee0837a0546309aa539d0d; version=5e7de55602c61c8ff28db075cc49c8dd6989d7e0; version=6.1.135 <6.2; version=6.12.25 <6.12.88; version=6.14.4 <6.15; version=6.15; version=63d5a3e207bf315a32c7d16de6c89753a759f95a; version=6.6.88 <6.6.140; version=952e7a7e317f126d0a2b879fc531b716932d5ffa <bb0988ed4f2e26d59bbb58f644cb3a55b7521e21; version=ee01a309ebf598be1ff8174901ed6e91619f1749

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo