---
id: CVE-2026-90124
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  irqchip/renesas-rzg2l: Fix loss of interrupt

  rzg2l_clear_irq_int() and rzg2l_clear_tint_int() perform a
  read-modify-write on the ISCR/TSCR status registers to clear th…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  irqchip/renesas-rzg2l: Fix loss of interrupt

  rzg2l_clear_irq_int() and rzg2l_clear_tint_int() perform a
  read-modify-write on the ISCR/TSCR status registers to clear th…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    c043591f03a8111f7d306b8122c444a949486269
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    b5ba8b861b5d833394bd23df3f4b59883ef18c88
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    3791e242ec2e5a5cd9e010a75ed1125d0e84d394
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    38c6831fefde0ff89f8d2dcb924f957a89dec414
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    dbecbe23dc606c4af68b4591a41124186f5c1802
  - >-
    Linux >= 3fed09559cd8be79568d368ce02bf7f2d56259b6 <
    50b10bd0c2d721ad38abd1abe3acdefb6caa0944
  - Linux 6.0
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:04.650'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90124'
references:
  - url: 'https://git.kernel.org/stable/c/3791e242ec2e5a5cd9e010a75ed1125d0e84d394'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/38c6831fefde0ff89f8d2dcb924f957a89dec414'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/50b10bd0c2d721ad38abd1abe3acdefb6caa0944'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b5ba8b861b5d833394bd23df3f4b59883ef18c88'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c043591f03a8111f7d306b8122c444a949486269'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dbecbe23dc606c4af68b4591a41124186f5c1802'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.883Z'
epss: 0.00206
epssPercentile: 0.10938
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

irqchip/renesas-rzg2l: Fix loss of interrupt

rzg2l_clear_irq_int() and rzg2l_clear_tint_int() perform a
read-modify-write on the ISCR/TSCR status registers to clear the bit
for the interrupt just handled. Since these registers are
write-0-to-clear per bit, this is racy:

If another interrupt's status bit gets set between the read and the write,
that bit is written back as 0 by the software-constructed value, clearing
an interrupt that hasn't been serviced yet and losing it.

This can be reproduced by triggering multiple interrupts at once, e.g.:

  gpioset -c gpiochip0 355=0 353=0 328=0 352=0

Fix this by writing back only the bit being cleared, with all other bits
set to 1, instead of read-modify-writing the whole register.  Since 1-bits
are left unchanged by hardware, concurrently-set status bits for other
interrupts are preserved.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.