{"id":"DEBIAN-CVE-2023-52851","details":"In the Linux kernel, the following vulnerability has been resolved:  IB/mlx5: Fix init stage error handling to avoid double free of same QP and UAF  In the unlikely event that workqueue allocation fails and returns NULL in mlx5_mkey_cache_init(), delete the call to mlx5r_umr_resource_cleanup() (which frees the QP) in mlx5_ib_stage_post_ib_reg_umr_init().  This will avoid attempted double free of the same QP when __mlx5_ib_add() does its cleanup.  Resolves a splat:     Syzkaller reported a UAF in ib_destroy_qp_user     workqueue: Failed to create a rescuer kthread for wq \"mkey_cache\": -EINTR    infiniband mlx5_0: mlx5_mkey_cache_init:981:(pid 1642):    failed to create work queue    infiniband mlx5_0: mlx5_ib_stage_post_ib_reg_umr_init:4075:(pid 1642):    mr cache init failed -12    ==================================================================    BUG: KASAN: slab-use-after-free in ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2073)    Read of size 8 at addr ffff88810da310a8 by task repro_upstream/1642     Call Trace:    \u003cTASK\u003e    kasan_report (mm/kasan/report.c:590)    ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2073)    mlx5r_umr_resource_cleanup (drivers/infiniband/hw/mlx5/umr.c:198)    __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4178)    mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)    ...    \u003c/TASK\u003e     Allocated by task 1642:    __kmalloc (./include/linux/kasan.h:198 mm/slab_common.c:1026    mm/slab_common.c:1039)    create_qp (./include/linux/slab.h:603 ./include/linux/slab.h:720    ./include/rdma/ib_verbs.h:2795 drivers/infiniband/core/verbs.c:1209)    ib_create_qp_kernel (drivers/infiniband/core/verbs.c:1347)    mlx5r_umr_resource_init (drivers/infiniband/hw/mlx5/umr.c:164)    mlx5_ib_stage_post_ib_reg_umr_init (drivers/infiniband/hw/mlx5/main.c:4070)    __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4168)    mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)    ...     Freed by task 1642:    __kmem_cache_free (mm/slub.c:1826 mm/slub.c:3809 mm/slub.c:3822)    ib_destroy_qp_user (drivers/infiniband/core/verbs.c:2112)    mlx5r_umr_resource_cleanup (drivers/infiniband/hw/mlx5/umr.c:198)    mlx5_ib_stage_post_ib_reg_umr_init (drivers/infiniband/hw/mlx5/main.c:4076    drivers/infiniband/hw/mlx5/main.c:4065)    __mlx5_ib_add (drivers/infiniband/hw/mlx5/main.c:4168)    mlx5r_probe (drivers/infiniband/hw/mlx5/main.c:4402)    ...","modified":"2026-09-15T09:02:49.124610216Z","published":"2024-05-21T16:15:22.160Z","upstream":["CVE-2023-52851"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-52851"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.64-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52851.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52851.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.8-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52851.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}