CVE-2023-54295
Unknown Unknown - Not Provided
Shift-Out-of-Bounds Vulnerability in Linux Kernel spi-nor Driver

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: Fix shift-out-of-bounds in spi_nor_set_erase_type spi_nor_set_erase_type() was used either to set or to mask out an erase type. When we used it to mask out an erase type a shift-out-of-bounds was hit: UBSAN: shift-out-of-bounds in drivers/mtd/spi-nor/core.c:2237:24 shift exponent 4294967295 is too large for 32-bit type 'int' The setting of the size_{shift, mask} and of the opcode are unnecessary when the erase size is zero, as throughout the code just the erase size is considered to determine whether an erase type is supported or not. Setting the opcode to 0xFF was wrong too as nobody guarantees that 0xFF is an unused opcode. Thus when masking out an erase type, just set the erase size to zero. This will fix the shift-out-of-bounds. [ta: refine changes, new commit message, fix compilation error]
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Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-05-07
AI Q&A
2025-12-30
EPSS Evaluated
2026-05-05
NVD
CVE-2023-54295
EUVD
EUVD-2023-60509
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a shift-out-of-bounds error in the Linux kernel's spi_nor_set_erase_type() function, which is part of the SPI NOR flash memory driver. The function was incorrectly handling the masking out of an erase type, causing an invalid shift operation with an excessively large shift exponent. This could lead to undefined behavior or crashes. The fix involves setting the erase size to zero when masking out an erase type, avoiding the erroneous shift and incorrect opcode setting.


How can this vulnerability impact me? :

The vulnerability can cause undefined behavior such as kernel crashes or instability due to the shift-out-of-bounds error in the SPI NOR flash driver. This could potentially affect system reliability or availability on systems using the affected Linux kernel versions.


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