{"id":"CVE-2024-53042","summary":"ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow()\n\nThere are code paths from which the function is called without holding\nthe RCU read lock, resulting in a suspicious RCU usage warning [1].\n\nFix by using l3mdev_master_upper_ifindex_by_index() which will acquire\nthe RCU read lock before calling\nl3mdev_master_upper_ifindex_by_index_rcu().\n\n[1]\nWARNING: suspicious RCU usage\n6.12.0-rc3-custom-gac8f72681cf2 #141 Not tainted\n-----------------------------\nnet/core/dev.c:876 RCU-list traversed in non-reader section!!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n1 lock held by ip/361:\n #0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60\n\nstack backtrace:\nCPU: 3 UID: 0 PID: 361 Comm: ip Not tainted 6.12.0-rc3-custom-gac8f72681cf2 #141\nHardware name: Bochs Bochs, BIOS Bochs 01/01/2011\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xba/0x110\n lockdep_rcu_suspicious.cold+0x4f/0xd6\n dev_get_by_index_rcu+0x1d3/0x210\n l3mdev_master_upper_ifindex_by_index_rcu+0x2b/0xf0\n ip_tunnel_bind_dev+0x72f/0xa00\n ip_tunnel_newlink+0x368/0x7a0\n ipgre_newlink+0x14c/0x170\n __rtnl_newlink+0x1173/0x19c0\n rtnl_newlink+0x6c/0xa0\n rtnetlink_rcv_msg+0x3cc/0xf60\n netlink_rcv_skb+0x171/0x450\n netlink_unicast+0x539/0x7f0\n netlink_sendmsg+0x8c1/0xd80\n ____sys_sendmsg+0x8f9/0xc20\n ___sys_sendmsg+0x197/0x1e0\n __sys_sendmsg+0x122/0x1f0\n do_syscall_64+0xbb/0x1d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f","modified":"2026-04-02T12:22:36.538779Z","published":"2024-11-19T17:19:30.854Z","related":["SUSE-SU-2024:4314-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:01601-1","SUSE-SU-2025:01603-1","SUSE-SU-2025:01652-1","SUSE-SU-2025:01663-1","SUSE-SU-2025:01675-1","SUSE-SU-2025:01682-1","SUSE-SU-2025:01683-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","SUSE-SU-2025:20339-1","SUSE-SU-2025:20340-1","SUSE-SU-2025:20349-1","SUSE-SU-2025:20351-1","SUSE-SU-2025:20367-1","SUSE-SU-2025:20368-1","USN-7276-1","USN-7277-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53042.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5edcb3fdb12c3d46a6e79eeeec27d925b80fc168"},{"type":"WEB","url":"https://git.kernel.org/stable/c/699b48fc31727792edf2cab3829586ae6ba649e2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6dfaa458fe923211c766238a224e0a3c0522935c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72c0f482e39c87317ebf67661e28c8d86c93e870"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad4a3ca6a8e886f6491910a3ae5d53595e40597d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2742758c9c85c84e077ede5f916479f724e11c2"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53042.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53042"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ab6c9463b137163ba53fc050bf2c72bed2c997b8"},{"fixed":"e2742758c9c85c84e077ede5f916479f724e11c2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"760852df570747e500a9632d34cbbf4faef30855"},{"fixed":"5edcb3fdb12c3d46a6e79eeeec27d925b80fc168"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"db53cd3d88dc328dea2e968c9c8d3b4294a8a674"},{"fixed":"72c0f482e39c87317ebf67661e28c8d86c93e870"},{"fixed":"699b48fc31727792edf2cab3829586ae6ba649e2"},{"fixed":"6dfaa458fe923211c766238a224e0a3c0522935c"},{"fixed":"ad4a3ca6a8e886f6491910a3ae5d53595e40597d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53042.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}