CVE-2026-43209 PUBLISHED

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

minix: Add required sanity checking to minix_check_superblock()

The fs/minix implementation of the minix filesystem does not currently support any other value for s_log_zone_size than 0. This is also the only value supported in util-linux; see mkfs.minix.c line 511. In addition, this patch adds some sanity checking for the other minix superblock fields, and moves the minix_blocks_needed() checks for the zmap and imap also to minix_check_super_block().

This also closes a related syzbot bug report.

• https://git.kernel.org/stable/c/a051ecf5c5b0387840dc210413ed3bc7fbdaa69c
• https://git.kernel.org/stable/c/d791c544efd6b9c944b43cf7f502e5bcb02fb941
• https://git.kernel.org/stable/c/66c7c239c65341f99ae388d4d53dc9df2bcb9925
• https://git.kernel.org/stable/c/2bb588cede1c1969e49c0a2822c8cb8b346b7682
• https://git.kernel.org/stable/c/f57ccd4657c7f082dc47e5b9e18a883bb5f9118f
• https://git.kernel.org/stable/c/31fefc18096cdc5549cfa54964d90e0b3229aedc
• https://git.kernel.org/stable/c/1efc128ee4adbc23e082715425ff895449d233bc
• https://git.kernel.org/stable/c/8c97a6ddc95690a938ded44b4e3202f03f15078c