CVE-2026-74329

watchdog: unregister PM notifier on watchdog unregister

N/A

Published: August 15, 2026 at 05:58 AM UTC

Updated: August 17, 2026 at 06:19 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: unregister PM notifier on watchdog unregister watchdog_register_device() registers wdd->pm_nb when WDOG_NO_PING_ON_SUSPEND is set, but watchdog_unregister_device() does not remove it. This leaves an embedded notifier block on the PM notifier chain after the watchdog device has been unregistered. A later suspend/resume notification can then call watchdog_pm_notifier() with a stale watchdog_device pointer, or at minimum after wdd->wd_data has been cleared by watchdog_dev_unregister(). Unregister the PM notifier before tearing down the watchdog device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

5.15 ≤ v < 5.15.2125.15 ≤ v < 6.1.1785.15 ≤ v < 6.12.975.15 ≤ v < 6.18.405.15 ≤ v < 6.6.1455.15 ≤ v < 7.1.55.15 ≤ v < 7.25.1560bcd91aafd22ef62cef9ae2037fa2e1d4da2fb3

Vendor states this is fixed in 298821692d447c2f7b1bc9ef41cd88a31bf56436 (fixed)

Vendor states this is fixed in 5d9b58ec6f5de5e159a570d419b1b08b3b9f854b (fixed)

Vendor states this is fixed in 89184909634e50d086d86d8a0c03fc86fe8d889f (fixed)

Vendor states this is fixed in a298c7302ee9584a7a1ac1e8acbede8d98ab51a4 (fixed)

Vendor states this is fixed in c70b5bb6f04f77ef90e047d7edc2f476e206909f (fixed)

Vendor states this is fixed in cd2d1b1f99308f7680d75a377daaff363f1cc736 (fixed)

Vendor states this is fixed in e690afea5c876a4abfa2978c6a664460ed7d1217 (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 5.15.212 (unaffected)

Vendor states this is fixed in 6.1.178 (unaffected)

Vendor states this is fixed in 6.12.97 (unaffected)

Vendor states this is fixed in 6.18.40 (unaffected)