{"id":"CVE-2023-52851","summary":"IB/mlx5: Fix init stage error handling to avoid double free of same QP and UAF","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mlx5: Fix init stage error handling to avoid double free of same QP and UAF\n\nIn the unlikely event that workqueue allocation fails and returns NULL in\nmlx5_mkey_cache_init(), delete the call to\nmlx5r_umr_resource_cleanup() (which frees the QP) in\nmlx5_ib_stage_post_ib_reg_umr_init().  This will avoid attempted double\nfree of the same QP when __mlx5_ib_add() does its cleanup.\n\nResolves a splat:\n\n   Syzkaller reported a UAF in ib_destroy_qp_user\n\n   workqueue: Failed to create a rescuer kthread for wq \"mkey_cache\": -EINTR\n   infiniband mlx5_0: mlx5_mkey_cache_init:981:(pid 1642):\n   failed to create work queue\n   infiniband mlx5_0: mlx5_ib_stage_post_ib_reg_umr_init:4075:(pid 1642):\n   mr cache init failed -12\n   ==================================================================\n   BUG: KASAN: slab-use-after-free in ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2073)\n   Read of size 8 at addr ffff88810da310a8 by task repro_upstream/1642\n\n   Call Trace:\n   \u003cTASK\u003e\n   kasan_report (mm/kasan/report.c:590)\n   ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2073)\n   mlx5r_umr_resource_cleanup (drivers/infiniband/hw/mlx5/umr.c:198)\n   __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4178)\n   mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)\n   ...\n   \u003c/TASK\u003e\n\n   Allocated by task 1642:\n   __kmalloc (./include/linux/kasan.h:198 mm/slab_common.c:1026\n   mm/slab_common.c:1039)\n   create_qp (./include/linux/slab.h:603 ./include/linux/slab.h:720\n   ./include/rdma/ib_verbs.h:2795 drivers/infiniband/core/verbs.c:1209)\n   ib_create_qp_kernel (drivers/infiniband/core/verbs.c:1347)\n   mlx5r_umr_resource_init (drivers/infiniband/hw/mlx5/umr.c:164)\n   mlx5_ib_stage_post_ib_reg_umr_init (drivers/infiniband/hw/mlx5/main.c:4070)\n   __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4168)\n   mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)\n   ...\n\n   Freed by task 1642:\n   __kmem_cache_free (mm/slub.c:1826 mm/slub.c:3809 mm/slub.c:3822)\n   ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2112)\n   mlx5r_umr_resource_cleanup (drivers/infiniband/hw/mlx5/umr.c:198)\n   mlx5_ib_stage_post_ib_reg_umr_init (drivers/infiniband/hw/mlx5/main.c:4076\n   drivers/infiniband/hw/mlx5/main.c:4065)\n   __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4168)\n   mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)\n   ...","modified":"2026-03-20T12:32:49.874796Z","published":"2024-05-21T15:31:47.220Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:2571-1","SUSE-SU-2024:2896-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52851.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2ef422f063b74adcc4a4a9004b0a87bb55e0a836"},{"type":"WEB","url":"https://git.kernel.org/stable/c/437f033e30c897bb3723eac9e9003cd9f88d00a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6387f269d84e6e149499408c4d1fc805017729b2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52851.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52851"},{"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":"04876c12c19e94bbbc94bb0446c7bc7cd75163de"},{"fixed":"437f033e30c897bb3723eac9e9003cd9f88d00a3"},{"fixed":"4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9"},{"fixed":"6387f269d84e6e149499408c4d1fc805017729b2"},{"fixed":"2ef422f063b74adcc4a4a9004b0a87bb55e0a836"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52851.json"}}],"schema_version":"1.7.5"}