CVE-2026-23308

Kernel log flooding via nested IRQ mask callbacks

Published Mar 25, 2026 · Updated Mar 25, 2026

Improper IRQ handling in the Linux kernel 6.4 and later allows local users to impair availability during equilibrium pinctrl driver load. eqbr_irq_mask_ack calls eqbr_irq_mask and eqbr_irq_ack, causing gpiochip_disable_irq to run within the combined callback and emit a warning for every GPIO. Reachability requires local low-privileged access and the equilibrium GPIO driver; the documented result is repeated kernel warnings, with no data access or modification reported.

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

Improper IRQ handling in the Linux kernel 6.4 and later allows local users to impair availability during equilibrium pinctrl driver load. eqbr_irq_mask_ack calls eqbr_irq_mask and eqbr_irq_ack, causing gpiochip_disable_irq to run within the combined callback and emit a warning for every GPIO. Reachability requires local low-privileged access and the equilibrium GPIO driver; the documented result is repeated kernel warnings, with no data access or modification reported.

The record

CVE
CVE-2026-23308
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=52066a53bd116a2f41d04d99b5095c02ad8cf953 <3e00b1b332e54ba50cca6691f628b9c06574024f
  2. Affected versionversion=52066a53bd116a2f41d04d99b5095c02ad8cf953 <53eba152810ef0fff8567b13ea0f62d48e62df6b
  3. Affected versionversion=52066a53bd116a2f41d04d99b5095c02ad8cf953 <896449ad9053a42c6c710aeae6175170176cabd0
  4. Affected versionversion=52066a53bd116a2f41d04d99b5095c02ad8cf953 <af3b0ec98dc1133521b612f8009fdd36b612aabe
  5. Affected versionversion=52066a53bd116a2f41d04d99b5095c02ad8cf953 <ec54546e8d8a50a9824c139a127a8459d1b0b1bb
  6. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=52066a53bd116a2f41d04d99b5095c02ad8cf953 <3e00b1b332e54ba50cca6691f628b9c06574024f; version=52066a53bd116a2f41d04d99b5095c02ad8cf953 <53eba152810ef0fff8567b13ea0f62d48e62df6b; version=52066a53bd116a2f41d04d99b5095c02ad8cf953 <896449ad9053a42c6c710aeae6175170176cabd0; version=52066a53bd116a2f41d04d99b5095c02ad8cf953 <af3b0ec98dc1133521b612f8009fdd36b612aabe; version=52066a53bd116a2f41d04d99b5095c02ad8cf953 <ec54546e8d8a50a9824c139a127a8459d1b0b1bb; version=6.4

Published CVSS scores

5.5NVDCVSS: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 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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