CVE-2021-46921

Kernel memory disclosure via misordered lock acquisition

Published Feb 27, 2024 · Updated Aug 5, 2026

A lock-ordering flaw in the Linux kernel allows local users to disclose kernel memory through concurrent epoll activity. In queued_write_lock_slowpath(), atomic_cmpxchg_relaxed() lacks acquire ordering, permitting subsequent reads before the writer truly owns the lock. An unprivileged local process must force concurrent epoll reader and writer activity; the race can expose or corrupt data observed through the misordered critical section.

CVSS severity7.8
High
EPSS probability0.24%
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

A lock-ordering flaw in the Linux kernel allows local users to disclose kernel memory through concurrent epoll activity. In queued_write_lock_slowpath(), atomic_cmpxchg_relaxed() lacks acquire ordering, permitting subsequent reads before the writer truly owns the lock. An unprivileged local process must force concurrent epoll reader and writer activity; the race can expose or corrupt data observed through the misordered critical section.

The record

CVE
CVE-2021-46921
Published
Feb 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-668
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.15
  2. Affected versionversion=b519b56e378ee82caf9b079b04f5db87dedc3251 <5902f9453a313be8fe78cbd7e7ca9dba9319fc6e
  3. Affected versionversion=b519b56e378ee82caf9b079b04f5db87dedc3251 <82808cc026811fbc3ecf0c0b267a12a339eead56
  4. Affected versionversion=b519b56e378ee82caf9b079b04f5db87dedc3251 <82fa9ced35d88581cffa4a1c856fc41fca96d80a
  5. Affected versionversion=b519b56e378ee82caf9b079b04f5db87dedc3251 <84a24bf8c52e66b7ac89ada5e3cfbe72d65c1896
  6. Affected versionversion=b519b56e378ee82caf9b079b04f5db87dedc3251 <d558fcdb17139728347bccc60a16af3e639649d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=b519b56e378ee82caf9b079b04f5db87dedc3251 <5902f9453a313be8fe78cbd7e7ca9dba9319fc6e; version=b519b56e378ee82caf9b079b04f5db87dedc3251 <82808cc026811fbc3ecf0c0b267a12a339eead56; version=b519b56e378ee82caf9b079b04f5db87dedc3251 <82fa9ced35d88581cffa4a1c856fc41fca96d80a; version=b519b56e378ee82caf9b079b04f5db87dedc3251 <84a24bf8c52e66b7ac89ada5e3cfbe72d65c1896; version=b519b56e378ee82caf9b079b04f5db87dedc3251 <d558fcdb17139728347bccc60a16af3e639649d2

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/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: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere

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