PT-2025-8903 · Linux+10 · Linux Kernel+10
Eric Dumazet
·
Published
2025-02-07
·
Updated
2026-04-20
·
CVE-2025-21791
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 vulnerability in the Linux kernel has been resolved. The issue is related to the function
l3mdev l3 out(), which can be called without RCU protection. This can lead to a potential use-after-free (UAF) issue. The vulnerability is exploited through a sequence of function calls, including raw sendmsg(), ip push pending frames(), ip send skb(), ip local out(), and ip local out(), ultimately calling l3mdev ip out(). To address this, an rcu read lock() / rcu read unlock() pair has been added.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
Alt Linux
Almalinux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu