Bug 2495936 (CVE-2026-53344) - CVE-2026-53344 kernel: pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init
Summary: CVE-2026-53344 kernel: pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr b...
Keywords:
Status: NEW
Alias: CVE-2026-53344
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-01 14:02 UTC by OSIDB Bzimport
Modified: 2026-07-01 18:34 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-07-01 14:02:04 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-07-01 18:26:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026070145-CVE-2026-53344-231c@gregkh/T
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