Bugzilla – Bug 1159441
VUL-0: CVE-2019-19241: kernel-source: privilege escalation via io_uring offload of sendmsg() onto kernel thread with kernel creds
Last modified: 2024-06-25 14:12:22 UTC
CVE-2019-19241 In the Linux kernel before 5.4.2, the io_uring feature leads to requests that inadvertently have UID 0 and full capabilities, aka CID-181e448d8709. This is related to fs/io-wq.c, fs/io_uring.c, and net/socket.c. For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface. This occurs because IORING_OP_SENDMSG operations, although requested in the context of an unprivileged user, are sometimes performed by a kernel worker thread without considering that context. References: https://bugs.chromium.org/p/project-zero/issues/detail?id=1975 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-19241 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19241 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709e517c9c7b523fcd209f24eb38ca7 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f891524c6bbf1e75b9ae69db4450953
io_uring introduced in version 5.1 [0] This issue affects only SLE15-SP2. The fixes[1][2] are already contained in the branch 15-SP2. Please update the references. [0]https://github.com/torvalds/linux/commit/2b188cc1bb857a9d4701ae59aa7768b5124e262e [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=181e448d8709 [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d69e07793f89
closing
OK, I'll update the patch references. Thanks.