CVE-2026-80993
Low risk· EPSS 6%Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, phylink_inband_caps() only checks whether the PCS returned by mac_select_pcs is NULL, but mac_select_pcs can also return an error pointer. This causes phylink_pcs_inband_caps() to dereference ops from the phylink_pcs struct despite the error, leading to a kernel panic.
Risk Assessment
A kernel panic causes system unavailability and disruption of network services. The risk affects systems using phylink with mac_select_pcs returning an error pointer.
Recommendation
Update the Linux kernel to a version containing the fix that uses the IS_ERR_OR_NULL macro to handle both NULL and error pointer cases. The fix prevents the kernel panic in phylink_inband_caps().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: phylink: correctly validate returned PCS in phylink_inband_caps In phylink_inband_caps(), the PCS returned by mac_select_pcs is only checked if NULL but mac_select_pcs can also return an error pointer. This can cause a kernel panic as phylink_pcs_inband_caps() only checks if passed PCS is not NULL and directly dereference ops from the phylink_pcs struct. Use the IS_ERR_OR_NULL macro to address both case where the returned PCS can be NULL or an error pointer and prevent a kernel panic.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS