CVE-2026-46033

Kernel memory disclosure via undersized authentication tag

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds read in Linux Kernel 4.11 and affected later revisions allows local users to read kernel memory or crash via AF_ALG. crypto_authenc_esn_create() accepts a 1-to-3-byte ahash digest as maxauthsize, although ESN tail handling always moves four sequence-number bytes against the tag. Exploitation requires local access and creation of a specially configured authencesn instance; the bounded effects are kernel-memory disclosure and a system crash.

CVSS severity7.1
High
EPSS probability0.13%
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 Kernel 4.11 and affected later revisions allows local users to read kernel memory or crash via AF_ALG. crypto_authenc_esn_create() accepts a 1-to-3-byte ahash digest as maxauthsize, although ESN tail handling always moves four sequence-number bytes against the tag. Exploitation requires local access and creation of a specially configured authencesn instance; the bounded effects are kernel-memory disclosure and a system crash.

The record

CVE
CVE-2026-46033
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1284, CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=4.11
  2. Affected versionversion=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <5db6ef9847717329f12c5ea8aba7e9f588a980c0
  3. Affected versionversion=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <67f1f0933cc3d78dde222842bcad2778ec7a0b88
  4. Affected versionversion=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <9aff81e8217e9de2929084b03b3c7f81988c112b
  5. Affected versionversion=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <b42821c15445f93daea3e76ada682b2b7181c476
  6. Affected versionversion=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <b69933e97efea238ebbfcf70c2b1be1cd03f13e3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <5db6ef9847717329f12c5ea8aba7e9f588a980c0; version=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <67f1f0933cc3d78dde222842bcad2778ec7a0b88; version=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <9aff81e8217e9de2929084b03b3c7f81988c112b; version=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <b42821c15445f93daea3e76ada682b2b7181c476; version=f15f05b0a5de667c821a9727c33bce9d1d9b26dd <b69933e97efea238ebbfcf70c2b1be1cd03f13e3

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1redhat-SADPCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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