{"id":"CVE-2022-48726","summary":"RDMA/ucma: Protect mc during concurrent multicast leaves","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Protect mc during concurrent multicast leaves\n\nPartially revert the commit mentioned in the Fixes line to make sure that\nallocation and erasing multicast struct are locked.\n\n  BUG: KASAN: use-after-free in ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n  BUG: KASAN: use-after-free in ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n  Read of size 8 at addr ffff88801bb74b00 by task syz-executor.1/25529\n  CPU: 0 PID: 25529 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n  Call Trace:\n   __dump_stack lib/dump_stack.c:88 [inline]\n   dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n   print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247\n   __kasan_report mm/kasan/report.c:433 [inline]\n   kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\n   ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline]\n   ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579\n   ucma_destroy_id+0x1e6/0x280 drivers/infiniband/core/ucma.c:614\n   ucma_write+0x25c/0x350 drivers/infiniband/core/ucma.c:1732\n   vfs_write+0x28e/0xae0 fs/read_write.c:588\n   ksys_write+0x1ee/0x250 fs/read_write.c:643\n   do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nCurrently the xarray search can touch a concurrently freeing mc as the\nxa_for_each() is not surrounded by any lock. Rather than hold the lock for\na full scan hold it only for the effected items, which is usually an empty\nlist.","modified":"2026-04-11T12:41:17.272331Z","published":"2024-06-20T11:13:15.957Z","related":["SUSE-SU-2024:2362-1","SUSE-SU-2024:2372-1","SUSE-SU-2024:2384-1","SUSE-SU-2024:2394-1","SUSE-SU-2024:2902-1","SUSE-SU-2024:2929-1","SUSE-SU-2024:2939-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48726.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2923948ffe0835f7114e948b35bcc42bc9b3baa1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/36e8169ec973359f671f9ec7213547059cae972e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75c610212b9f1756b9384911d3a2c347eee8031c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48726.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48726"},{"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":"95fe51096b7adf1d1e7315c49c75e2f75f162584"},{"fixed":"75c610212b9f1756b9384911d3a2c347eee8031c"},{"fixed":"2923948ffe0835f7114e948b35bcc42bc9b3baa1"},{"fixed":"ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a"},{"fixed":"36e8169ec973359f671f9ec7213547059cae972e"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48726.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"5.10.99"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.16.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48726.json"}}],"schema_version":"1.7.5"}