CVE-2026-90124

irqchip/renesas-rzg2l: Fix loss of interrupt

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< c043591f03a8111f7d306b8122c444a949486269
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< b5ba8b861b5d833394bd23df3f4b59883ef18c88
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< 3791e242ec2e5a5cd9e010a75ed1125d0e84d394
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< 38c6831fefde0ff89f8d2dcb924f957a89dec414
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< dbecbe23dc606c4af68b4591a41124186f5c1802
`3fed09559cd8be79568d368ce02bf7f2d56259b6`	affected	< 50b10bd0c2d721ad38abd1abe3acdefb6caa0944

Linux

affected

Version	Status	Constraints
`6.0`	affected	—
`0`	unaffected	< 6.0
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,c043591f03a8111f7d306b8122c444a949486269)`	affected	code_commit	—
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,b5ba8b861b5d833394bd23df3f4b59883ef18c88)`	affected	code_commit	—
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,3791e242ec2e5a5cd9e010a75ed1125d0e84d394)`	affected	code_commit	—
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,38c6831fefde0ff89f8d2dcb924f957a89dec414)`	affected	code_commit	—
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,dbecbe23dc606c4af68b4591a41124186f5c1802)`	affected	code_commit	—
`[3fed09559cd8be79568d368ce02bf7f2d56259b6,50b10bd0c2d721ad38abd1abe3acdefb6caa0944)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`6.0`	affected	semver	—
`[0,6.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.211% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/3791e242ec2e5a5cd9e010a75ed1125d0e84d394
https://git.kernel.org/stable/c/38c6831fefde0ff89f8d2dcb924f957a89dec414
https://git.kernel.org/stable/c/50b10bd0c2d721ad38abd1abe3acdefb6caa0944
https://git.kernel.org/stable/c/b5ba8b861b5d833394bd23df3f4b59883ef18c88
https://git.kernel.org/stable/c/c043591f03a8111f7d306b8122c444a949486269
https://git.kernel.org/stable/c/dbecbe23dc606c4af68b4591a41124186f5c1802

History

Sep 20, 2026 3:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-727

Sep 17, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		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.
Title		irqchip/renesas-rzg2l: Fix loss of interrupt
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/3791e242ec2e5a5cd9e010a75ed1125d0e84d394 https://git.kernel.org/stable/c/38c6831fefde0ff89f8d2dcb924f957a89dec414 https://git.kernel.org/stable/c/50b10bd0c2d721ad38abd1abe3acdefb6caa0944 https://git.kernel.org/stable/c/b5ba8b861b5d833394bd23df3f4b59883ef18c88 https://git.kernel.org/stable/c/c043591f03a8111f7d306b8122c444a949486269 https://git.kernel.org/stable/c/dbecbe23dc606c4af68b4591a41124186f5c1802