{"id":"CVE-2023-52851","state":"PUBLISHED","title":"IB/mlx5: Fix init stage error handling to avoid double free of same QP and UAF","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   ...","publishedAt":"2024-05-21T15:31:47.220Z","updatedAt":"2026-05-11T19:34:14.999Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"437f033e30c897bb3723eac9e9003cd9f88d00a3","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"6387f269d84e6e149499408c4d1fc805017729b2","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"2ef422f063b74adcc4a4a9004b0a87bb55e0a836","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/mlx5/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.63","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.12","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.2","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/mlx5/main.c"]}],"references":["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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52851.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52851","state":"PUBLISHED","datePublished":"2024-05-21T15:31:47.220Z","dateUpdated":"2026-05-11T19:34:14.999Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T15:19:24.255Z"},"containers":{"cna":{"title":"IB/mlx5: Fix init stage error handling to avoid double free of same QP and UAF","descriptions":[{"lang":"en","value":"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   ..."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"437f033e30c897bb3723eac9e9003cd9f88d00a3","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"6387f269d84e6e149499408c4d1fc805017729b2","versionType":"git"},{"version":"04876c12c19e94bbbc94bb0446c7bc7cd75163de","status":"affected","lessThan":"2ef422f063b74adcc4a4a9004b0a87bb55e0a836","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/mlx5/main.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.63","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.5.12","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6.2","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/hw/mlx5/main.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/437f033e30c897bb3723eac9e9003cd9f88d00a3"},{"url":"https://git.kernel.org/stable/c/4f4a7a7d1404297f2a92df0046f7e64dc5c52dd9"},{"url":"https://git.kernel.org/stable/c/6387f269d84e6e149499408c4d1fc805017729b2"},{"url":"https://git.kernel.org/stable/c/2ef422f063b74adcc4a4a9004b0a87bb55e0a836"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:34:14.999Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.63"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.5.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.7"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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