CVE-2025-21988: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: fs/netfs/read_collect: add to next->prev_donated If multiple subrequests donate data to the same "next" request (depending on the subrequest completion order), each of them would overwrite the `prev_donated` field, causing data corruption and a BUG() crash ("Can't donate prior to front").

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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	6.12 — 6.12.20
linux	linux_kernel	6.13 — 6.13.8

References

Advisories & Patches

https://git.kernel.org/stable/c/62b9ad7e52d4777f7e775ee1f0ad2452f6041024 https://git.kernel.org/stable/c/e25cec3b76aba47a49138d2162fc809c6cd49c9e https://git.kernel.org/stable/c/e2d46f2ec332533816417b60933954173f602121

Frequently Asked Questions

What is CVE-2025-21988? +

In the Linux kernel, the following vulnerability has been resolved: fs/netfs/read_collect: add to next->prev_donated If multiple subrequests donate data to the same "next" request (depending on the subrequest completion order), each of them would overwrite the `prev_donated` field, causing data corruption and a BUG() crash ("Can't donate prior to front"). It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21988? +

CVE-2025-21988 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-2025-21988? +

CVE-2025-21988 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-2025-21988? +

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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