In the Linux kernel, the following vulnerability has been resolved:

netfilter: nfnetlink_queue: Initialize ctx to avoid memory allocation error

It is possible that ctx in nfqnl_build_packet_message() could be used
before it is properly initialize, which is only initialized
by nfqnl_get_sk_secctx().

This patch corrects this problem by initializing the lsmctx to a safe
value when it is declared.

This is similar to the commit 35fcac7a7c25
("audit: Initialize lsmctx to avoid memory allocation error").

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-22110
• https://git.kernel.org/stable/c/778b09d91baafb13408470c721d034d6515cfa5a
• https://git.kernel.org/stable/c/ddbf7e1d82a1d0c1d3425931a6cb1b83f8454759