CVE-2026-23287

Device freeze via incorrect PLIC enable-state check

Published Mar 25, 2026 · Updated Mar 25, 2026

Denial of service in the Linux kernel's SiFive PLIC driver allows local users to freeze an interrupt-driven device by changing IRQ affinity. The plic_irq_eoi() path tests generic IRQ-disabled state instead of the PLIC enable bit, so it can send completion while the handling hart's source is disabled and the controller silently ignores it. The condition requires local privilege to change IRQ affinity during active interrupt handling; the affected device can remain frozen when its interrupt never completes.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel's SiFive PLIC driver allows local users to freeze an interrupt-driven device by changing IRQ affinity. The plic_irq_eoi() path tests generic IRQ-disabled state instead of the PLIC enable bit, so it can send completion while the handling hart's source is disabled and the controller silently ignores it. The condition requires local privilege to change IRQ affinity during active interrupt handling; the affected device can remain frozen when its interrupt never completes.

The record

CVE
CVE-2026-23287
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=5.1
  2. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <1072020685f4b81f6efad3b412cdae0bd62bb043
  3. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <1883332bf21feb8871af09daf604fc4836a76925
  4. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <2edbd173309165d103be6c73bd83e459dc45ae7b
  5. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <686eb378a4a51aa967e08337dd59daade16aec0f
  6. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <8942fb1a5bc2dcbd88f7e656d109d42f778f298f
  7. Affected versionversion=cc9f04f9a84f745949e325661550ed14bd0ff322 <f611791a927141d05d7030607dea6372311c1413

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.1; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <1072020685f4b81f6efad3b412cdae0bd62bb043; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <1883332bf21feb8871af09daf604fc4836a76925; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <2edbd173309165d103be6c73bd83e459dc45ae7b; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <686eb378a4a51aa967e08337dd59daade16aec0f; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <8942fb1a5bc2dcbd88f7e656d109d42f778f298f; version=cc9f04f9a84f745949e325661550ed14bd0ff322 <f611791a927141d05d7030607dea6372311c1413

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

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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

T1499.004Application or System Exploitation

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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