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CVE-2026-98907: btrfs: protect sb_write_pointer() with invalidate lock

• 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: btrfs: protect sb_write_pointer() with invalidate lock sb_write_pointer() reads the super block from the block device page cache using read_cache_page_gfp(). This has the same race with BLKBSZSET as the one fixed by commit 3f29d661e568 ("btrfs: sync read disk super and set block size"). Take the mapping invalidate lock around read_cache_page_gfp() to serialize the read against block size changes.

Affected products

• Linux kernel: before 5.15.222; before 6.1.189; before 6.6.158; before 6.12.111; before 6.18.53 — fixed in 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.222, 6.1.189, 6.12.111, 6.18.53. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/123b9a545f4d0348e81f558a032bf2a93ee5722f
• https://git.kernel.org/stable/c/80cd97c5e90096d040a623851795eac92fbd0ff1

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