What’s Vulnerable › Vulnerabilities

CVE-2026-43166: erofs: fix interlaced plain identification for encoded extents

• Severity: high (CVSS 7.1 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
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix interlaced plain identification for encoded extents Only plain data whose start position and on-disk physical length are both aligned to the block size should be classified as interlaced plain extents. Otherwise, it must be treated as shifted plain extents. This issue was found by syzbot using a crafted compressed image containing plain extents with unaligned physical lengths, which can cause OOB read in z_erofs_transform_plain().

Affected products

• Linux kernel: from 6.15 before 6.18.16; from 6.19 before 6.19.6; 7.0-rc1 — fixed in 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4a2d046e4b13202a6301a993961f5b30ae4d7119
• https://git.kernel.org/stable/c/9d5a97bc71ed5783687705c708454c4453aa91d1
• https://git.kernel.org/stable/c/d3790f26d38606f020212486359b84632c19d08b

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