CVE-2025-40278

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.

PUBLISHED Reserved 2025-04-16 | Published 2025-12-06 | Updated 2025-12-06 | Assigner Linux

Product status

References

git.kernel.org/...c/918e063304f945fb93be9bb70cacea07d0b730ea

git.kernel.org/...c/5e3644ef147bf7140259dfa4cace680c9b26fe8b

git.kernel.org/...c/37f0680887c5aeba9a433fe04b35169010568bb1

git.kernel.org/...c/2191662058443e0bcc28d11694293d8339af6dde

git.kernel.org/...c/a676a296af65d33725bdf7396803180957dbd92e

git.kernel.org/...c/d1dbbbe839647486c9b893e5011fe84a052962df

git.kernel.org/...c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e

git.kernel.org/...c/ce50039be49eea9b4cd8873ca6eccded1b4a130a

cve.org (CVE-2025-40278)

nvd.nist.gov (CVE-2025-40278)

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