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CVE-2025-21699: gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-12 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag Truncate an inode's address space when flipping the GFS2_DIF_JDATA flag: depending on that flag, the pages in the address space will either use buffer heads or iomap_folio_state structs, and we cannot mix the two.

Affected products

• Linux kernel: before 5.4.290; from 5.5 before 5.10.234; from 5.11 before 5.15.178; from 5.16 before 6.1.128; from 6.2 before 6.6.75; from 6.7 before 6.12.12 — fixed in 5.10.234, 5.15.178, 5.4.290, 6.1.128, 6.12.12, 6.6.75

How to fix

Upgrade to a fixed version: Linux kernel 5.10.234, 5.15.178, 5.4.290, 6.1.128. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2a40a140e11fec699e128170ccaa98b6b82cb503
• https://git.kernel.org/stable/c/4516febe325342555bb09ca5b396fb816d655821
• https://git.kernel.org/stable/c/4dd57d1f0e9844311c635a7fb39abce4f2ac5a61
• https://git.kernel.org/stable/c/4e3ded34f3f3c9d7ed2aac7be8cf51153646574a
• https://git.kernel.org/stable/c/5bb1fd0855bb0abc7d97e44758d6ffed7882d2d0
• https://git.kernel.org/stable/c/7c9d9223802fbed4dee1ae301661bf346964c9d2
• https://git.kernel.org/stable/c/8c41abc11aa8438c9ed2d973f97e66674c0355df
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

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