Bug 2516301 (CVE-2026-72329)

Summary: CVE-2026-72329 kernel: net/liquidio: drop cached VF pci_dev LUT
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
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Hardware: All   
OS: Linux   
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A flaw was found in the `net/liquidio` component of the Linux kernel. The Single Root I/O Virtualization (SR-IOV) enable path incorrectly cached Virtual Function (VF) `pci_dev` pointers. This improper handling of references could lead to a use-after-free vulnerability when the cached pointer is later accessed. A local attacker could potentially leverage this to cause a system crash, leading to a denial of service.
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Description OSIDB Bzimport 2026-08-15 06:05:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/liquidio: drop cached VF pci_dev LUT

The PF SR-IOV enable path caches VF pci_dev pointers in
dpiring_to_vfpcidev_lut[] by iterating with pci_get_device(). Those
entries do not own a reference, because the iterator drops the previous
device reference on each step. The cached pointer is then dereferenced
later when handling OCTEON_VF_FLR_REQUEST.

Replace the cached VF mapping with runtime lookup on the mailbox DPI
ring: derive the VF index from q_no, resolve the VF via exported PCI
IOV helpers, validate it with the PF pointer and VF ID, then issue
pcie_flr() and drop the reference with pci_dev_put(). Remove the
unused VF lookup table initialization and cleanup.
Comment 1 Keith Grant 2026-08-18 21:14:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081508-CVE-2026-72329-c884@gregkh/T