Bug 2448693 (CVE-2026-23256)

Summary: CVE-2026-23256 kernel: net: liquidio: Fix off-by-one error in VF setup_nic_devices() cleanup
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
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 memory leak was found in the Linux kernel's LiquidIO network driver for Virtual Functions (VF). In setup_nic_devices(), when initialization fails, the cleanup loop uses while(i--) which skips freeing resources at the failing index i due to an off-by-one error. This causes memory to leak on each initialization failure.
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Description OSIDB Bzimport 2026-03-18 18:02:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: liquidio: Fix off-by-one error in VF setup_nic_devices() cleanup

In setup_nic_devices(), the initialization loop jumps to the label
setup_nic_dev_free on failure. The current cleanup loop while(i--)
skip the failing index i, causing a memory leak.

Fix this by changing the loop to iterate from the current index i
down to 0.

Compile tested only. Issue found using code review.
Comment 1 Jon Moroney 2026-03-18 19:41:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031818-CVE-2026-23256-b93b@gregkh/T