PT-2025-30120 · Linux+9 · Linux Kernel+9
Anubis
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Published
2025-06-30
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Updated
2026-04-20
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CVE-2025-38350
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 Linux kernel contains a flaw in the networking scheduler where certain classful qdiscs may unexpectedly empty a child qdisc, leading to a use-after-free condition. This can occur when a classful qdisc invokes its classes' dequeue handler on an enqueue operation. The issue arises from incomplete backlog accounting, potentially affecting parent qdiscs as well. A reproducer involving
tc commands and socat demonstrates the use-after-free. The fix ensures that qdisc tree reduce backlog always calls qlen notify when the child qdisc is empty, preventing the use-after-free by resetting the qlen to 0 during qdisc deletion or purging.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
LPE
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Centos
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu