Bug 2481909 (CVE-2026-45869)

Summary: CVE-2026-45869 kernel: power: supply: wm97xx: Fix NULL pointer dereference in power_supply_changed()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: unspecified    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel, specifically within the wm97xx power supply driver. A timing issue, known as a race condition, can occur during the driver's setup. If an interrupt is triggered at a precise moment, it can cause the system to attempt to use an uninitialized memory pointer, leading to a NULL pointer dereference. This vulnerability could allow a local attacker to crash the system, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-27 15:01:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

power: supply: wm97xx: Fix NULL pointer dereference in power_supply_changed()

In `probe()`, `request_irq()` is called before allocating/registering a
`power_supply` handle. If an interrupt is fired between the call to
`request_irq()` and `power_supply_register()`, the `power_supply` handle
will be used uninitialized in `power_supply_changed()` in
`wm97xx_bat_update()` (triggered from the interrupt handler). This will
lead to a `NULL` pointer dereference since

Fix this racy `NULL` pointer dereference by making sure the IRQ is
requested _after_ the registration of the `power_supply` handle. Since
the IRQ is the last thing requests in the `probe()` now, remove the
error path for freeing it. Instead add one for unregistering the
`power_supply` handle when IRQ request fails.
Comment 1 Keith Grant 2026-05-28 03:51:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052712-CVE-2026-45869-9867@gregkh/T