CVE-2026-46190mtd: spi-nor: debugfs: fix out-of-bounds read in spi_nor_params_show()

Official description

In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: debugfs: fix out-of-bounds read in spi_nor_params_show() Sashiko noticed an out-of-bounds read [1]. In spi_nor_params_show(), the snor_f_names array is passed to spi_nor_print_flags() using sizeof(snor_f_names). Since snor_f_names is an array of pointers, sizeof() returns the total number of bytes occupied by the pointers (element_count * sizeof(void *)) rather than the element count itself. On 64-bit systems, this makes the passed length 8x larger than intended. Inside spi_nor_print_flags(), the 'names_len' argument is used to bounds-check the 'names' array access. An out-of-bounds read occurs if a flag bit is set that exceeds the array's actual element count but is within the inflated byte-size count. Correct this by using ARRAY_SIZE() to pass the actual number of string pointers in the array.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/231b8e1f604f6e0a7e100536f506cdf482e2c5f5
• https://git.kernel.org/stable/c/9a80c458320e0514e11945402dd6e48fcee05524
• https://git.kernel.org/stable/c/ca18c180b053f6ce80394322b314ac721c316af7
• https://git.kernel.org/stable/c/34bdcfb496b29f9a52431194f94473b37fb8c162
• https://git.kernel.org/stable/c/c0b654bc0b76a1da102d9138be1ed1223bd99310
• https://git.kernel.org/stable/c/e47029b977e747cb3a9174308fd55762cce70147
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html