Bug 2536142 (CVE-2026-90281)

Summary: CVE-2026-90281 kernel: phy: qcom: snps-femto-v2: Fix possible NULL-deref on early runtime suspend
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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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Doc Text:
A flaw was found in the Linux kernel's QCOM SNPS Femto V2 PHY driver. During an early runtime suspend, a timing window exists where the power management (PM) callbacks may attempt to access an uninitialized hardware-specific PHY (hsphy) instance. This can lead to a NULL pointer dereference, potentially causing a system crash or denial of service.
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Description OSIDB Bzimport 2026-09-17 16:40:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

phy: qcom: snps-femto-v2: Fix possible NULL-deref on early runtime suspend

Runtime PM must be enabled before creating the PHY, since phy_create()
only enables runtime PM on the PHY device if it is already enabled on
this parent device. However, the runtime PM callbacks dereference the
hsphy instance, which is not yet ready, leaving a window where a suspend
callback may trigger a NULL pointer dereference.

Take a runtime PM usage reference with pm_runtime_get_noresume() before
enabling runtime PM and release it once the PHY has been created, so that
no runtime suspend can run before the PHY is ready. This also prevents a
short window where an unnecessary runtime suspend can occur.

Use the devres-managed version to ensure PM runtime is symmetrically
disabled during driver removal for proper cleanup.
Comment 1 Mauro Matteo Cascella 2026-09-24 16:23:30 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90281.mbox