Medium [CVE-2026-53344] Initialize mcp->dev and mcp->addr before regmap init
This medium-severity Red Hat Linux advisory covers CVE-2026-53344.
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Summary
In the Linux kernel, the following vulnerability has been resolved: pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init Regmap initialization triggers regcache_maple_populate() which attempts SPI read to populate cache. SPI read requires mcp->dev and mcp->addr to be set, without them, NULL pointer dereference occurs during probe.
Move initialization before mcp23s08_spi_regmap_init() call. During the initialization of the `regmap` (register map) for the `mcp23s08` component, an attempt to perform an SPI (Serial Peripheral Interface) read occurs before critical device parameters (`mcp->dev` and `mcp->addr`) are properly set.
This premature access leads to a NULL pointer dereference, which can cause a system crash and result in a Denial of Service (DoS). Red Hat severity: Moderate.
Weakness: CWE-476. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 9 days ago·verify at source
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