PT-2025-25837 · Linux+6 · Linux Kernel+6
Published
2025-02-24
·
Updated
2026-05-26
·
CVE-2025-38063
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to the version containing commit 2def2845cc33
Description
The issue is related to the Linux kernel, where an unconditional IO throttle is caused by REQ PREFLUSH. This occurs when a bio with REQ PREFLUSH is submitted to dm, generating a flush bio that is throttled by wbt wait(). The problem exists in the upstream version and is similar to an issue found in v5.4. The estimated number of potentially affected devices is not provided. There is no information about real-world incidents where this issue was exploited.
Recommendations
For Linux kernel versions prior to the version containing commit 2def2845cc33, the fix involves conditionally adding REQ IDLE to flush bio.bi opf, which makes wbt should throttle() return false to avoid wbt wait(). As a temporary workaround, consider disabling the
send empty flush() function until a patch is available. Restrict access to the vulnerable dm module to minimize the risk of exploitation. Avoid using the REQ PREFLUSH parameter in the affected API endpoint until the issue is resolved.Exploit
Fix
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu