CVE-2024-44957

Local denial of service via irqfd deadlock

Published Sep 4, 2024 · Updated May 11, 2026

Improper locking in Linux Xen privcmd irqfds allows local users to hang kernel operations by releasing an associated eventfd. The irqfd_wakeup() callback tries to acquire a mutex while eventfd_release() invokes it under spin_lock_irqsave(), causing a lock-order deadlock on EPOLLHUP. Exploitation requires local low-privileged access and an active Xen privcmd irqfd; the bounded consequence is an availability-only hang.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Xen privcmd irqfds allows local users to hang kernel operations by releasing an associated eventfd. The irqfd_wakeup() callback tries to acquire a mutex while eventfd_release() invokes it under spin_lock_irqsave(), causing a lock-order deadlock on EPOLLHUP. Exploitation requires local low-privileged access and an active Xen privcmd irqfd; the bounded consequence is an availability-only hang.

The record

CVE
CVE-2024-44957
Published
Sep 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.6
  2. Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <1c682593096a487fd9aebc079a307ff7a6d054a3
  3. Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <49f2a5da6785b2dbde93e291cae037662440346e
  4. Affected versionversion=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <c2775ae4d9227729f8ca9ee2a068f62a00d5ea9c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <1c682593096a487fd9aebc079a307ff7a6d054a3; version=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <49f2a5da6785b2dbde93e291cae037662440346e; version=f8941e6c4c712948663ec5d7bbb546f1a0f4e3f6 <c2775ae4d9227729f8ca9ee2a068f62a00d5ea9c

Published CVSS scores

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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

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Your stack

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