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CVE-2026-90161: erofs: fix interlaced ztailpacking pclusters

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix interlaced ztailpacking pclusters On-disk sizes of interlaced pclusters should be block-aligned, and ztailpacking interlaced pclusters should be invalid at all. Currently, mkfs.erofs won't generate any interlaced pcluster with ztailpacking enabled, so this doesn't affect any existing valid filesystems. However, crafted images can contain invalid interlaced ztailpacking pclusters, resulting in an out-of-bounds read from a kmap'd page and copying irrelevant kernel memory into userspace-visible page cache.

Affected products

• Linux: from 6.0.16 before 6.1 — fixed in 6.1

How to fix

Upgrade to a fixed version: Linux 6.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/451027c642e752420e1a04237db9ce7b35cee595
• https://git.kernel.org/stable/c/795dca34a41545d377d19bc492b10bc789772410
• https://git.kernel.org/stable/c/862427ebb81d1f6abbf74d799790e1694b37b187
• https://git.kernel.org/stable/c/b634286a8628155557a4f473a9dbab18bb439a7b
• https://git.kernel.org/stable/c/cd59f91cbc1e715cb5dc65773ee22123d70cb8f2
• https://git.kernel.org/stable/c/ddb7ea4fd99bf6c4314d1dfca18aec6945ce8054

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