{"cve":"CVE-2025-21714","nvd":{"published":"2025-02-27T02:15:15.050","modified":"2026-10-21T13:17:55.160","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix implicit ODP use after free\n\nPrevent double queueing of implicit ODP mr destroy work by using\n__xa_cmpxchg() to make sure this is the only time we are destroying this\nspecific mr.\n\nWithout this change, we could try to invalidate this mr twice, which in\nturn could result in queuing a MR work destroy twice, and eventually the\nsecond work could execute after the MR was freed due to the first work,\ncausing a user after free and trace below.\n\n   refcount_t: underflow; use-after-free.\n   WARNING: CPU: 2 PID: 12178 at lib/refcount.c:28 refcount_warn_saturate+0x12b/0x130\n   Modules linked in: bonding ib_ipoib vfio_pci ip_gre geneve nf_tables ip6_gre gre ip6_tunnel tunnel6 ipip tunnel4 ib_umad rdma_ucm mlx5_vfio_pci vfio_pci_core vfio_iommu_type1 mlx5_ib vfio ib_uverbs mlx5_core iptable_raw openvswitch nsh rpcrdma ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_cm ib_core xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xt_addrtype iptable_nat nf_nat br_netfilter rpcsec_gss_krb5 auth_rpcgss oid_registry overlay zram zsmalloc fuse [last unloaded: ib_uverbs]\n   CPU: 2 PID: 12178 Comm: kworker/u20:5 Not tainted 6.5.0-rc1_net_next_mlx5_58c644e #1\n   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n   Workqueue: events_unbound free_implicit_child_mr_work [mlx5_ib]\n   RIP: 0010:refcount_warn_saturate+0x12b/0x130\n   Code: 48 c7 c7 38 95 2a 82 c6 05 bc c6 fe 00 01 e8 0c 66 aa ff 0f 0b 5b c3 48 c7 c7 e0 94 2a 82 c6 05 a7 c6 fe 00 01 e8 f5 65 aa ff <0f> 0b 5b c3 90 8b 07 3d 00 00 00 c0 74 12 83 f8 01 74 13 8d 50 ff\n   RSP: 0018:ffff8881008e3e40 EFLAGS: 00010286\n   RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027\n   RDX: ffff88852c91b5c8 RSI: 0000000000000001 RDI: ffff88852c91b5c0\n   RBP: ffff8881dacd4e00 R08: 00000000ffffffff R09: 0000000000000019\n   R10: 000000000000072e R11: 0000000063666572 R12: ffff88812bfd9e00\n   R13: ffff8881c792d200 R14: ffff88810011c005 R15: ffff8881002099c0\n   FS:  0000000000000000(0000) GS:ffff88852c900000(0000) knlGS:0000000000000000\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n   CR2: 00007f5694b5e000 CR3: 00000001153f6003 CR4: 0000000000370ea0\n   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n   DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n   Call Trace:\n    <TASK>\n    ? refcount_warn_saturate+0x12b/0x130\n    free_implicit_child_mr_work+0x180/0x1b0 [mlx5_ib]\n    process_one_work+0x1cc/0x3c0\n    worker_thread+0x218/0x3c0\n    kthread+0xc6/0xf0\n    ret_from_fork+0x1f/0x30\n    </TASK>","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-416"],"references":["https://git.kernel.org/stable/c/7cc8f681f6d4ae4478ae0f60485fc768f2b450da","https://git.kernel.org/stable/c/a306dfff6b76aafa264ad33874a8992a8d5858b7","https://git.kernel.org/stable/c/d3d930411ce390e532470194296658a960887773","https://git.kernel.org/stable/c/edfb65dbb9ffd3102f3ff4dd21316158e56f1976"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2025-21714","score":0.00241,"percentile":0.15043,"date":"2026-10-25"},"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."]}