Bug 2540310 (CVE-2026-93274)

Summary: CVE-2026-93274 kernel: pinctrl: bcm2835: Don't remove an unregistered GPIO chip
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's Broadcom BCM2835 pin control driver. During device initialization, if pin controller registration fails, the driver attempts to remove an unregistered General Purpose Input/Output (GPIO) chip. This improper error handling leads to a null pointer dereference, causing a Denial of Service (DoS) through a kernel panic.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-24 16:19:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

pinctrl: bcm2835: Don't remove an unregistered GPIO chip

If the devm_pinctrl_register() function fails,
bcm2835_pinctrl_probe() calls gpiochip_remove()
before gpiochip_add_data() has registered the GPIO chip.

This means that upon failure the gpio_chip.gpiodev
 is NULL resulting in a null pointer dereference
inside the gpiochip_remove() function.

Remove the unnecessary function call to gpiochip_remove().
No GPIO cleanup is required because the GPIO chip
has not yet been registered. Without this change there
is potential for a kernel panic upon registration failure
Comment 1 gkamathe 2026-09-28 12:42:28 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93274.mbox