CVE-2025-21699: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.4.290
linux	linux_kernel	5.5 — 5.10.234
linux	linux_kernel	5.11 — 5.15.178
linux	linux_kernel	5.16 — 6.1.128
linux	linux_kernel	6.2 — 6.6.75
linux	linux_kernel	6.7 — 6.12.12
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2025-21699? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21699? +

CVE-2025-21699 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21699? +

CVE-2025-21699 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21699? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-21699