{"cve":"CVE-2023-52851","nvd":{"published":"2024-05-21T16:15:22.160","modified":"2026-06-17T06:43:44.010","status":"Analyzed","description":"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   <TASK>\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   </TASK>\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   ...","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-415","CWE-416"],"references":["https://git.kernel.org/stable/c/2ef422f063b74adcc4a4a9004b0a87bb55e0a836","https://git.kernel.org/stable/c/437f033e30c897bb3723eac9e9003cd9f88d00a3","https://git.kernel.org/stable/c/4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9","https://git.kernel.org/stable/c/6387f269d84e6e149499408c4d1fc805017729b2","https://git.kernel.org/stable/c/2ef422f063b74adcc4a4a9004b0a87bb55e0a836"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2023-52851","score":0.00238,"percentile":0.14916,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}