PT-2025-4320 · Linux+7 · Linux Kernel+7
Published
2025-01-08
·
Updated
2025-10-03
·
CVE-2025-21639
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 6.6.74
Description
The issue concerns the Linux kernel, where using the 'net' structure via 'current' is not recommended due to inconsistency and potential null pointer dereferences. The 'net' structure can be obtained from the table->data using container of(). This problem can result in an 'Oops' when the current task is exiting.
Recommendations
For Linux kernel versions prior to 6.6.74, update to version 6.6.74 or later to resolve the issue. As a temporary workaround, consider modifying the code to obtain the 'net' structure from table->data using container of() instead of relying on current->nsproxy. Restrict access to the vulnerable
sctp.rto min/max parameters to minimize the risk of exploitation.Exploit
Fix
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu