CVE-2023-53768

Technical Description

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

regmap-irq: Fix out-of-bounds access when allocating config buffers

When allocating the 2D array for handling IRQ type registers in

regmap_add_irq_chip_fwnode(), the intent is to allocate a matrix

with num_config_bases rows and num_config_regs columns.

This is currently handled by allocating a buffer to hold a pointer for

each row (i.e. num_config_bases). After that, the logic attempts to

allocate the memory required to hold the register configuration for

each row. However, instead of doing this allocation for each row

(i.e. num_config_bases allocations), the logic erroneously does this

allocation num_config_regs number of times.

This scenario can lead to out-of-bounds accesses when num_config_regs

is greater than num_config_bases. Fix this by updating the terminating

condition of the loop that allocates the memory for holding the register

configuration to allocate memory only for each row in the matrix.

Amit Pund

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