# CVE-2026-90124: irqchip/renesas-rzg2l: Fix loss of interrupt

CVE-2026-90124 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90124, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-90124
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90124

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-90124](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90124.md) | Sep 23, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-90124](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90124.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90124](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90124.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-90124](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90124.md) | Sep 23, 2026 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.