CVE-2026-46149

Kernel stack disclosure and panic via oversized IQN

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds read in the Linux Kernel allows local users to disclose kernel stack data or panic the system through a configfs read. The target_tg_pt_gp_members_show() path trusts snprintf()'s would-have-written length and passes it to memcpy(), which reads beyond a 256-byte stack buffer when an iSCSI IQN is long. Any local user can read the world-readable members attribute after a long-IQN target is configured; fortified kernels panic, while others return adjacent kernel stack contents.

CVSS severity7.1
High
EPSS probability0.14%
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 the Linux Kernel allows local users to disclose kernel stack data or panic the system through a configfs read. The target_tg_pt_gp_members_show() path trusts snprintf()'s would-have-written length and passes it to memcpy(), which reads beyond a 256-byte stack buffer when an iSCSI IQN is long. Any local user can read the world-readable members attribute after a long-IQN target is configured; fortified kernels panic, while others return adjacent kernel stack contents.

The record

CVE
CVE-2026-46149
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-674
Attack vector
local
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

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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=2.6.38
  2. Affected versionversion=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <00d91bfdce5033f5d9b4915638ae9b0553848b5d
  3. Affected versionversion=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <1f678d13e939f91840cb1ebe9b88544923539d3c
  4. Affected versionversion=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e
  5. Affected versionversion=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <772a896a56e0e3ef9424a025cec9176f9d8f4552
  6. Affected versionversion=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <e501154f9d82c95d2719bcbbaf679d8fd3226ef7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.38; version=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <00d91bfdce5033f5d9b4915638ae9b0553848b5d; version=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <1f678d13e939f91840cb1ebe9b88544923539d3c; version=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <72cc5ea7ef32bb5fa38bf0dd2e56fcd73aa8c89e; version=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <772a896a56e0e3ef9424a025cec9176f9d8f4552; version=c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 <e501154f9d82c95d2719bcbbaf679d8fd3226ef7

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion

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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