PT-2025-11024 · Linux+7 · Linux Kernel+7
Ilia Gavrilov
·
Published
2025-02-13
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Updated
2026-04-20
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CVE-2025-21862
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Linux kernel versions prior to 5.10.209
Description:
The issue is related to the incorrect initialization order in the drop monitor module. When built as a kernel module, syzkaller may send a netlink NET DM CMD START message during module loading, calling the net dm monitor start() function that uses an uninitialized spinlock. This can lead to a spinlock bad magic error. The problem is resolved by prioritizing resource initialization above the registration of a generic netlink family.
Recommendations:
To fix this issue, update the Linux kernel to a version that includes the fix for the incorrect initialization order in the drop monitor module. If the kernel version is prior to 5.10.209, consider updating to a newer version to mitigate the risk. As a temporary workaround, consider disabling the drop monitor module until a patch is available.
Exploit
Fix
Use of Uninitialized Resource
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu