CVE-2026-92477Hinoki check available

Out-of-bounds read via unterminated debugfs input

Published Sep 17, 2026 · Updated Sep 17, 2026

An out-of-bounds read in Linux 5.16 UFS debugfs allows local users to trigger unsafe parsing via a full-length write. The ufs_saved_err_write() handler copies 16 bytes into a zero-initialized stack buffer, removing its terminator before calling kstrtoint(). Access requires an exposed UFS debugfs file and write permission to saved_err or saved_uic_err, which have owner-only permissions; published evidence does not establish a resulting crash or data disclosure.

CVSS severity6.8
Medium
EPSS probability0.17%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

An out-of-bounds read in Linux 5.16 UFS debugfs allows local users to trigger unsafe parsing via a full-length write. The ufs_saved_err_write() handler copies 16 bytes into a zero-initialized stack buffer, removing its terminator before calling kstrtoint(). Access requires an exposed UFS debugfs file and write permission to saved_err or saved_uic_err, which have owner-only permissions; published evidence does not establish a resulting crash or data disclosure.

The record

CVE
CVE-2026-92477
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=5.16
  2. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <2b3fb5693c25c21741f357a8c9d0e1f19b7e368f
  3. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <587be18e0935632ebd367b0f89e37aa5762e400f
  4. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <abd26e6b53c4169122d61fdd4cabe09bdd916aac
  5. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <b43890843e834300f967c69e74c7c2eb22cb1664
  6. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <cc92af8cc0e4dacd4375d34475141b0f1a70c09e
  7. Affected versionversion=7340faae947400907e5e7581444712110d2811d5 <d223989e1a1edad217b673486b093bd157fb6c9a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=7340faae947400907e5e7581444712110d2811d5 <2b3fb5693c25c21741f357a8c9d0e1f19b7e368f; version=7340faae947400907e5e7581444712110d2811d5 <587be18e0935632ebd367b0f89e37aa5762e400f; version=7340faae947400907e5e7581444712110d2811d5 <abd26e6b53c4169122d61fdd4cabe09bdd916aac; version=7340faae947400907e5e7581444712110d2811d5 <b43890843e834300f967c69e74c7c2eb22cb1664; version=7340faae947400907e5e7581444712110d2811d5 <cc92af8cc0e4dacd4375d34475141b0f1a70c09e; version=7340faae947400907e5e7581444712110d2811d5 <d223989e1a1edad217b673486b093bd157fb6c9a

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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