Bug 2525503 (CVE-2026-80621)

Summary: CVE-2026-80621 kernel: PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, 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 PCI DesignWare Cores (DWC) driver. When the controller lacks RAS DES capability, the dwc_pcie_rasdes_debugfs_init() function can incorrectly report success, leaving a pointer uninitialized. During debugfs teardown, the dwc_pcie_rasdes_debugfs_deinit() function then attempts to use this uninitialized pointer, leading to a NULL pointer dereference. This can allow a local attacker to cause a system crash, resulting in a Denial of Service (DoS).
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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 2026-08-28 07:48:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability

dwc_pcie_rasdes_debugfs_init() returns success when the controller has no
RAS DES capability, leaving pci->debugfs->rasdes_info unset. The common
debugfs teardown path still calls dwc_pcie_rasdes_debugfs_deinit(), which
dereferences rasdes_info unconditionally.

Return early when no RAS DES state was allocated. In that case no RAS DES
mutex was initialized, so there is nothing to destroy.

[mani: reworded subject]
Comment 1 Mauro Matteo Cascella 2026-08-31 08:42:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082836-CVE-2026-80621-fc18@gregkh/T