CVE-2025-40278

/// Technical description

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

net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak

Fix a KMSAN kernel-infoleak detected by the syzbot .

[net?] KMSAN: kernel-infoleak in __skb_datagram_iter

In tcf_ife_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.

This change silences the KMSAN report and prevents potential information

leaks from the kernel memory.

This fix has been tested and validated by syzbot. This patch closes the

bug reported at the following syzkaller link and ensures no infoleak.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References