CVE-2026-43087

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

pinctrl: mcp23s08: Disable all pin interrupts during probe

A chip being probed may have the interrupt-on-change feature enabled on

some of its pins, for example after a reboot. This can cause the chip to

generate interrupts for pins that don't have a registered nested handler,

which leads to a kernel crash such as below:

[ 7.928897] Unable to handle kernel read from unreadable memory at virtual address 00000000000000ac

[ 7.932314] Mem abort info:

[ 7.935081] ESR = 0x0000000096000004

[ 7.938808] EC = 0x25: DABT (current EL), IL = 32 bits

[ 7.944094] SET = 0, FnV = 0

[ 7.947127] EA = 0, S1PTW = 0

[ 7.950247] FSC = 0x04: level 0 translation fault

[ 7.955101] Data abort info:

[ 7.957961] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000

[ 7.963421] CM = 0, WnR = 0, TnD = 0, TagAccess = 0

[ 7.968447] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0

[ 7.973734] user pgtable: 4k pag

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References