{"id":"CVE-2023-54239","summary":"iommufd: Check for uptr overflow","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Check for uptr overflow\n\nsyzkaller found that setting up a map with a user VA that wraps past zero\ncan trigger WARN_ONs, particularly from pin_user_pages weirdly returning 0\ndue to invalid arguments.\n\nPrevent creating a pages with a uptr and size that would math overflow.\n\n  WARNING: CPU: 0 PID: 518 at drivers/iommu/iommufd/pages.c:793 pfn_reader_user_pin+0x2e6/0x390\n  Modules linked in:\n  CPU: 0 PID: 518 Comm: repro Not tainted 6.3.0-rc2-eeac8ede1755+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n  RIP: 0010:pfn_reader_user_pin+0x2e6/0x390\n  Code: b1 11 e9 25 fe ff ff e8 28 e4 0f ff 31 ff 48 89 de e8 2e e6 0f ff 48 85 db 74 0a e8 14 e4 0f ff e9 4d ff ff ff e8 0a e4 0f ff \u003c0f\u003e 0b bb f2 ff ff ff e9 3c ff ff ff e8 f9 e3 0f ff ba 01 00 00 00\n  RSP: 0018:ffffc90000f9fa30 EFLAGS: 00010246\n  RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff821e2b72\n  RDX: 0000000000000000 RSI: ffff888014184680 RDI: 0000000000000002\n  RBP: ffffc90000f9fa78 R08: 00000000000000ff R09: 0000000079de6f4e\n  R10: ffffc90000f9f790 R11: ffff888014185418 R12: ffffc90000f9fc60\n  R13: 0000000000000002 R14: ffff888007879800 R15: 0000000000000000\n  FS:  00007f4227555740(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000020000043 CR3: 000000000e748005 CR4: 0000000000770ef0\n  PKRU: 55555554\n  Call Trace:\n   \u003cTASK\u003e\n   pfn_reader_next+0x14a/0x7b0\n   ? interval_tree_double_span_iter_update+0x11a/0x140\n   pfn_reader_first+0x140/0x1b0\n   iopt_pages_rw_slow+0x71/0x280\n   ? __this_cpu_preempt_check+0x20/0x30\n   iopt_pages_rw_access+0x2b2/0x5b0\n   iommufd_access_rw+0x19f/0x2f0\n   iommufd_test+0xd11/0x16f0\n   ? write_comp_data+0x2f/0x90\n   iommufd_fops_ioctl+0x206/0x330\n   __x64_sys_ioctl+0x10e/0x160\n   ? __pfx_iommufd_fops_ioctl+0x10/0x10\n   do_syscall_64+0x3b/0x90\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc","modified":"2026-03-20T12:33:30.604820Z","published":"2025-12-30T12:11:28.378Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54239.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/800963e7eb001ada8cf2418f159fb649694467f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e4395701330fc4aee530905039516fe770b81417"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54239.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54239"},{"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":"8d160cd4d5066f864ec0f2c981470e55ac03ac27"},{"fixed":"800963e7eb001ada8cf2418f159fb649694467f1"},{"fixed":"e4395701330fc4aee530905039516fe770b81417"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54239.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54239.json"}}],"schema_version":"1.7.5"}