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CVE-2026-72424: rtc: msc313: fix NULL deref in shared IRQ handler at probe

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: rtc: msc313: fix NULL deref in shared IRQ handler at probe msc313_rtc_probe() calls devm_request_irq() with IRQF_SHARED and &pdev->dev as the cookie, but platform_set_drvdata() is only called later after the clock setup. With a shared IRQ line, another device on the same line can trigger the handler in that window. The handler does dev_get_drvdata() on the cookie, gets NULL, and dereferences priv->rtc_base in interrupt context. Pass priv as the cookie directly so the handler reads it from dev_id without the lookup, removing the dependency on probe order.

Affected products

• Linux kernel: 5.16 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f6a4aec0d36647eb2f67cd69db22bd28cabe2cb
• https://git.kernel.org/stable/c/52c73b6992b46ed476590ed526faa033d4fbfc5d
• https://git.kernel.org/stable/c/a369f48be8de426a7d2bca18dbd46c2ad1138803
• https://git.kernel.org/stable/c/bb3e624808c981fe881cb79037be63e680ed7d38
• https://git.kernel.org/stable/c/bc1f61a9b97d65de21c2681bcf0b5b1392c58486
• https://git.kernel.org/stable/c/ece7b9ffde23e2ccd7567761ac27463ded43932c

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