Bug 2516316 (CVE-2026-72158)

Summary: CVE-2026-72158 kernel: fpga: dfl: add bounds check in dfh_get_param_size()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's FPGA Dynamic Function Link (DFL) subsystem. A malicious FPGA device can provide specially crafted parameter headers, causing the system to miscalculate the size of a feature region. This incorrect size can lead to a memory corruption vulnerability when data is copied, potentially resulting in a denial of service (DoS) for the system.
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Description OSIDB Bzimport 2026-08-15 06:06:08 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fpga: dfl: add bounds check in dfh_get_param_size()

dfh_get_param_size() can return a parameter size larger than the feature
region because the loop bounds check is evaluated before incrementing
size. If the EOP (End of Parameters) bit is set in the same iteration,
the inflated size is returned without re-validation against max.

This can cause create_feature_instance() to call memcpy_fromio() with a
size exceeding the ioremap'd region when a malicious FPGA device provides
crafted DFHv1 parameter headers.

Add a bounds check after the size increment to ensure the accumulated
size never exceeds the feature boundary.
Comment 1 Keith Grant 2026-08-18 13:26:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081535-CVE-2026-72158-d66b@gregkh/T