CVE-2026-80993

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdf874f9e52c340cc6f0a0014a97b778f67d46849 < b6b533f83461c3730875cf3ed5ff6362dcb67be9affected
LinuxLinuxdf874f9e52c340cc6f0a0014a97b778f67d46849 < fb4d77553841ae85bed9b2cf03351c401e871d85affected
LinuxLinuxdf874f9e52c340cc6f0a0014a97b778f67d46849 < f2849b1fd059ec9b3281b771e6ac5aad9feee851affected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References