CVE-2026-43077

Local service interruption via undersized decrypt buffer

Published May 6, 2026 · Updated May 6, 2026

Denial of service in affected Linux Kernel releases allows local users to interrupt service through an undersized AEAD receive buffer. The minimum receive-size check in crypto/algif_aead.c omits the authentication-tag length when validating output space for decryption. Unprivileged AF_ALG access is the gate; upstream material does not identify the exact runtime failure mode beyond loss of availability.

CVSS severity5.5
Medium
EPSS probability0.12%
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

Denial of service in affected Linux Kernel releases allows local users to interrupt service through an undersized AEAD receive buffer. The minimum receive-size check in crypto/algif_aead.c omits the authentication-tag length when validating output space for decryption. Unprivileged AF_ALG access is the gate; upstream material does not identify the exact runtime failure mode beyond loss of availability.

The record

CVE
CVE-2026-43077
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=4.14
  2. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <1c76b5675119f694458293a2a81f40731c69bd32
  3. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <3afdc15d6173614d7d834517d9b65e7aa5a08548
  4. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <3d14bd48e3a77091cbce637a12c2ae31b4a1687c
  5. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <74a66fdb5282d89e348b00c42cfca3a936946d94
  6. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <78cea133daf721698876e56135049a96d39d610a
  7. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <af2fa2fbbced26129813274b8b3f7705f280e174
  8. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <e86ab1e5661386a874fbb8551f0c04b8e9f8ad22
  9. Affected versionversion=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <fd427dd84f224309afbcc2cb67c7bb770a01265c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <1c76b5675119f694458293a2a81f40731c69bd32; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <3afdc15d6173614d7d834517d9b65e7aa5a08548; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <3d14bd48e3a77091cbce637a12c2ae31b4a1687c; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <74a66fdb5282d89e348b00c42cfca3a936946d94; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <78cea133daf721698876e56135049a96d39d610a; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <af2fa2fbbced26129813274b8b3f7705f280e174; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <e86ab1e5661386a874fbb8551f0c04b8e9f8ad22; version=d887c52d6ae43aeebd249b5f2f1333e60236aa60 <fd427dd84f224309afbcc2cb67c7bb770a01265c

Published CVSS scores

7.1Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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

T1499Endpoint Denial of Service

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