PT-2025-21643 · Linux+10 · Linux Kernel+10
Published
2025-04-25
·
Updated
2026-04-20
·
CVE-2025-37890
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:
A Use After Free (UAF) vulnerability has been identified in the Linux kernel's HFSC network scheduler when it has a netem child qdisc. The issue arises because the HFSC assumes that checking for
cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree, which is not true for the netem duplicate case. This vulnerability can be exploited due to a reentrant case. The estimated number of potentially affected devices worldwide is not available. There is no information about real-world incidents where this issue was exploited.Recommendations:
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
DoS
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Astra Linux
Centos
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu