CVE-2024-26687

Kernel crash via Xen event-channel cleanup race

Published Apr 3, 2024 · Updated May 11, 2026

Race condition in Linux kernel Xen event handling allows local users to crash the kernel by concurrently recycling event channels. The shutdown_pirq and __unbind_from_irq paths close an event channel before clearing evtchn_to_irq, allowing startup_pirq to reuse the channel before cleanup invalidates its new mapping. Triggering the kernel BUG requires a Xen guest and concurrent IRQ teardown and startup, observed during NVMe probing with many devices.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel Xen event handling allows local users to crash the kernel by concurrently recycling event channels. The shutdown_pirq and __unbind_from_irq paths close an event channel before clearing evtchn_to_irq, allowing startup_pirq to reuse the channel before cleanup invalidates its new mapping. Triggering the kernel BUG requires a Xen guest and concurrent IRQ teardown and startup, observed during NVMe probing with many devices.

The record

CVE
CVE-2024-26687
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-459, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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

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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=2.6.37
  2. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <0fc88aeb2e32b76db3fe6a624b8333dbe621b8fd
  3. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <20980195ec8d2e41653800c45c8c367fa1b1f2b4
  4. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <585a344af6bcac222608a158fc2830ff02712af5
  5. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <9470f5b2503cae994098dea9682aee15b313fa44
  6. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <9be71aa12afa91dfe457b3fb4a444c42b1ee036b
  7. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <ea592baf9e41779fe9a0424c03dd2f324feca3b3
  8. Affected versionversion=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <fa765c4b4aed2d64266b694520ecb025c862c5a9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.37; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <0fc88aeb2e32b76db3fe6a624b8333dbe621b8fd; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <20980195ec8d2e41653800c45c8c367fa1b1f2b4; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <585a344af6bcac222608a158fc2830ff02712af5; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <9470f5b2503cae994098dea9682aee15b313fa44; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <9be71aa12afa91dfe457b3fb4a444c42b1ee036b; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <ea592baf9e41779fe9a0424c03dd2f324feca3b3; version=d46a78b05c0e37f76ddf4a7a67bf0b6c68bada55 <fa765c4b4aed2d64266b694520ecb025c862c5a9

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.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
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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