What’s Vulnerable › Vulnerabilities

CVE-2026-43209: minix: Add required sanity checking to minix_check_superblock()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17

Description

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.

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

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

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