PT-2025-6938 · Linux+9 · Linux Kernel+9
Quang Le
·
Published
2025-02-03
·
Updated
2026-01-14
·
CVE-2025-21702
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions:
Linux kernel (affected versions not specified)
Description:
The issue is related to the
pfifo tail enqueue function in the Linux kernel. When sch->limit == 0 and pfifo tail enqueue is triggered on a scheduler with no packets, the function will not drop a packet and will instead increase the scheduler's qlen by one, returning a NET XMIT CN status code. This can lead to a situation where the parent's qlen does not equal the sum of its children's qlen, violating the design. The problem can be exploited for user-to-kernel privilege escalation when reachable.Recommendations:
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Almalinux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu