What’s Vulnerable › Vulnerabilities

CVE-2026-98879: isofs: handle set_blocksize failures

• Severity: unknown
• 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: 2026-10-23 · updated 2026-10-26

Description

In the Linux kernel, the following vulnerability has been resolved: isofs: handle set_blocksize failures isofs uses buffer_heads, which don't handle block size > PAGE_SIZE well. Without this, mounting we will hit the BUG_ON(offset >= folio_size(folio)); in folio_set_bh on the first __bread_gfp call.

Affected products

• Linux kernel: before 5.10.271; before 5.15.222; before 6.1.189; before 6.6.158; before 6.12.111; before 6.18.53 — fixed in 5.10.271, 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158

How to fix

Upgrade to a fixed version: Linux kernel 5.10.271, 5.15.222, 6.1.189, 6.12.111. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32
• https://git.kernel.org/stable/c/28d1f6aa14f5924e36602b7a31c9141d34de0b9c
• https://git.kernel.org/stable/c/61f277bf35f533b602984f0e55900111fe52f31a
• https://git.kernel.org/stable/c/6db7f0ba365786304558db6a3d52013ae176e03e
• https://git.kernel.org/stable/c/9584ab6283721e5aab485c79bd06c2f78d89e55c
• https://git.kernel.org/stable/c/9c97e3b1152d3092581745189f5d2f04c6404ef9
• https://git.kernel.org/stable/c/cebde6d88e34396c29f2f001d90e921677cc17d6

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