Bug 2454859 (CVE-2026-31389)

Summary: CVE-2026-31389 kernel: spi: fix use-after-free on controller registration failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's Serial Peripheral Interface (SPI) subsystem. During controller registration, a use-after-free vulnerability can occur if the allocation of per-CPU statistics fails. This could allow a local attacker to cause system instability or a denial of service by accessing freed memory.
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Description OSIDB Bzimport 2026-04-03 16:04:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

spi: fix use-after-free on controller registration failure

Make sure to deregister from driver core also in the unlikely event that
per-cpu statistics allocation fails during controller registration to
avoid use-after-free (of driver resources) and unclocked register
accesses.
Comment 1 Jon Moroney 2026-04-03 17:17:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040324-CVE-2026-31389-036b@gregkh/T