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Message-ID: <2025120717-CVE-2025-40278-dae4@gregkh> Date: Sun, 7 Dec 2025 06:52:25 +0900 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-40278: net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak From: Greg Kroah-Hartman <gregkh@...nel.org> 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. The Linux kernel CVE team has assigned CVE-2025-40278 to this issue. Affected and fixed versions =========================== Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 5.4.302 with commit 918e063304f945fb93be9bb70cacea07d0b730ea Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 5.10.247 with commit 5e3644ef147bf7140259dfa4cace680c9b26fe8b Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 5.15.197 with commit 37f0680887c5aeba9a433fe04b35169010568bb1 Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 6.1.159 with commit 2191662058443e0bcc28d11694293d8339af6dde Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 6.6.117 with commit a676a296af65d33725bdf7396803180957dbd92e Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 6.12.59 with commit d1dbbbe839647486c9b893e5011fe84a052962df Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 6.17.9 with commit c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e Issue introduced in 4.6 with commit ef6980b6becb1afd9d82a4f043749a10ae81bf14 and fixed in 6.18 with commit ce50039be49eea9b4cd8873ca6eccded1b4a130a Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-40278 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/sched/act_ife.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/918e063304f945fb93be9bb70cacea07d0b730ea https://git.kernel.org/stable/c/5e3644ef147bf7140259dfa4cace680c9b26fe8b https://git.kernel.org/stable/c/37f0680887c5aeba9a433fe04b35169010568bb1 https://git.kernel.org/stable/c/2191662058443e0bcc28d11694293d8339af6dde https://git.kernel.org/stable/c/a676a296af65d33725bdf7396803180957dbd92e https://git.kernel.org/stable/c/d1dbbbe839647486c9b893e5011fe84a052962df https://git.kernel.org/stable/c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e https://git.kernel.org/stable/c/ce50039be49eea9b4cd8873ca6eccded1b4a130a
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