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

Summary

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.

Timeline

1. May 28, 2026, 9:36 AM UTCCVE published
2. Oct 15, 2026, 1:21 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in 231b8e1f604f6e0a7e100536f506cdf482e2c5f5; From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in 9a80c458320e0514e11945402dd6e48fcee05524; From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in ca18c180b053f6ce80394322b314ac721c316af7; From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in 34bdcfb496b29f9a52431194f94473b37fb8c162; From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in c0b654bc0b76a1da102d9138be1ed1223bd99310; From 0257be79fc4a16a3252ce80aa13b3640f728c425 · fixed in e47029b977e747cb3a9174308fd55762cce70147

• Linux Linux

  5.19

• KernelLinux

  From 5.19.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.88; From 6.13.0 · fixed in 6.18.30; From 6.19.0 · fixed in 7.0.7

References 6