PT-2025-14303 · Linux+7 · Linux Kernel+7
Published
2025-02-28
·
Updated
2026-04-20
·
CVE-2025-21922
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 (affected versions not specified)
Description
A vulnerability has been resolved in the Linux kernel related to the ppp driver, which fails to initialize a 2-byte header when using socket filter, causing a KMSAN uninit-value warning. This issue can be triggered by carefully crafted BPF programs, such as those generated by syzkaller, which start reading from offset 0. The vulnerable code skips 2 bytes of data and then reads the
Protocol field to determine if it's an IP packet, and then reads the first byte of the first 2 bytes to determine the direction. However, only the first byte indicating direction is initialized in the current ppp driver code, while the second byte is not initialized.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use of Uninitialized Resource
Access of Uninitialized Pointer
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Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu