PT-2025-31065 · Linux+5 · Linux Kernel+5
Published
2025-07-17
·
Updated
2026-04-20
·
CVE-2025-38468
CVSS v2.0
6.0
Medium
| Vector | AV:L/AC:H/Au:S/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw exists in the Linux kernel’s networking scheduler (net/sched) related to handling empty red-black trees within the
htb lookup leaf function. Specifically, a BUG ON condition can be triggered when htb lookup leaf encounters an empty rbtree. This occurs due to a sequence of events involving packet queuing and dequeueing within the HTB (Hierarchical Token Bucket) queuing discipline, potentially leading to a system crash. The issue arises from the interaction between htb dequeue, netem dequeue, blackhole enqueue, and htb lookup leaf. The root cause is that blackhole enqueue can return a value other than NET XMIT SUCCESS, leading to a chain of function calls that ultimately trigger the BUG ON in htb lookup leaf when the rbtree is empty.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu