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

net: sched: act_connmark: initialize struct tc_ife to fix kernel leak

In tcf_connmark_dump(), the variable 'opt' was partially initialized using a
designatied initializer. While the padding bytes are reamined
uninitialized. nla_put() copies the entire structure into a
netlink message, these uninitialized bytes leaked to userspace.

Initialize the structure with memset before assigning its fields
to ensure all members and padding are cleared prior to beign copied.

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-40279
• https://git.kernel.org/stable/c/218b67c8c8246d47a2a7910eae80abe4861fe2b7
• https://git.kernel.org/stable/c/25837889ec062f2b7618142cd80253dff3da5343
• https://git.kernel.org/stable/c/31e4aa93e2e5b5647fc235b0f6ee329646878f9e
• https://git.kernel.org/stable/c/51cb05d4fd632596816ba44e882e84db9fb28a7e
• https://git.kernel.org/stable/c/62b656e43eaeae445a39cd8021a4f47065af4389
• https://git.kernel.org/stable/c/73cc56c608c209d3d666cc571293b090a471da70