CVE-2025-37797 — Use After Free in Linux
Severity
7.8HIGHNVD
OSV8.8OSV5.5
EPSS
0.1%
top 75.99%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMay 2
Latest updateJan 16
Description
In the Linux kernel, the following vulnerability has been resolved:
net_sched: hfsc: Fix a UAF vulnerability in class handling
This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class
handling. The issue occurs due to a time-of-check/time-of-use condition
in hfsc_change_class() when working with certain child qdiscs like netem
or codel.
The vulnerability works as follows:
1. hfsc_change_class() checks if a class has packets (q.qlen != 0)
2. It then calls qdisc_peek_len(), which…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9
Affected Packages9 packages
Also affects: Debian Linux 11.0