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CVE-2026-98121: watchdog: msc313e: Fix NULL pointer dereference in PM callbacks

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-22
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: msc313e: Fix NULL pointer dereference in PM callbacks msc313e_wdt_probe() doesn't set the driver data for the platform device. As a result, dev_get_drvdata() in msc313e_wdt_suspend() and msc313e_wdt_resume() will return NULL, leading to a NULL pointer dereference afterward. Set the platform device driver data in msc313e_wdt_probe().

Affected products

• Linux kernel: from 5.14 before 5.15.222; from 5.16 before 6.1.189; from 6.2 before 6.6.158; from 6.7 before 6.12.111; from 6.13 before 6.18.53; from 6.19 before 7.2.7 — fixed in 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158, 7.2.7

How to fix

Upgrade to a fixed version: Linux kernel 5.15.222, 6.1.189, 6.12.111, 6.18.53. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6495dc16e635356fd2b7535dcbf9b6779de4e753
• https://git.kernel.org/stable/c/744b25040d8206f7925b8ba0be5edf93fa4bf81e
• https://git.kernel.org/stable/c/960251cc4a413d8f1eef2a2c6aca41073b57ce16
• https://git.kernel.org/stable/c/a135415be56839e555e0bcdd5ffb8d2f5f947bd7
• https://git.kernel.org/stable/c/afc3ea51e479289a23c642cc8bade67b94225ed9
• https://git.kernel.org/stable/c/b02f902fe4b59d65f74a25c4523a75453bd3f808
• https://git.kernel.org/stable/c/e3eceb76515910746e6268c4e4ac1c07516ebd7b

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