{"id":"CVE-2021-47197","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-47197","generatedAt":"2026-10-27T19:57:24.157Z","title":"In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: nullify cq->dbg pointer in mlx5_debug_cq_remove() Prior to this patch in case mlx5_core_destroy_cq() failed it proceeds to rest of destroy operations. mlx5_core_destroy_cq()…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: nullify cq->dbg pointer in mlx5_debug_cq_remove()\n\nPrior to this patch in case mlx5_core_destroy_cq() failed it proceeds\nto rest of destroy operations. mlx5_core_destroy_cq() could be called again\nby user and cause additional call of mlx5_debug_cq_remove().\ncq->dbg was not nullify in previous call and cause the crash.\n\nFix it by nullify cq->dbg pointer after removal.\n\nAlso proceed to destroy operations only if FW return 0\nfor MLX5_CMD_OP_DESTROY_CQ command.\n\ngeneral protection fault, probably for non-canonical address 0x2000300004058: 0000 [#1] SMP PTI\nCPU: 5 PID: 1228 Comm: python Not tainted 5.15.0-rc5_for_upstream_min_debug_2021_10_14_11_06 #1\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\nRIP: 0010:lockref_get+0x1/0x60\nCode: 5d e9 53 ff ff ff 48 8d 7f 70 e8 0a 2e 48 00 c7 85 d0 00 00 00 02\n00 00 00 c6 45 70 00 fb 5d c3 c3 cc cc cc cc cc cc cc cc 53 <48> 8b 17\n48 89 fb 85 d2 75 3d 48 89 d0 bf 64 00 00 00 48 89 c1 48\nRSP: 0018:ffff888137dd7a38 EFLAGS: 00010206\nRAX: 0000000000000000 RBX: ffff888107d5f458 RCX: 00000000fffffffe\nRDX: 000000000002c2b0 RSI: ffffffff8155e2e0 RDI: 0002000300004058\nRBP: ffff888137dd7a88 R08: 0002000300004058 R09: ffff8881144a9f88\nR10: 0000000000000000 R11: 0000000000000000 R12: ffff8881141d4000\nR13: ffff888137dd7c68 R14: ffff888137dd7d58 R15: ffff888137dd7cc0\nFS:  00007f4644f2a4c0(0000) GS:ffff8887a2d40000(0000)\nknlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000055b4500f4380 CR3: 0000000114f7a003 CR4: 0000000000170ea0\nCall Trace:\n  simple_recursive_removal+0x33/0x2e0\n  ? debugfs_remove+0x60/0x60\n  debugfs_remove+0x40/0x60\n  mlx5_debug_cq_remove+0x32/0x70 [mlx5_core]\n  mlx5_core_destroy_cq+0x41/0x1d0 [mlx5_core]\n  devx_obj_cleanup+0x151/0x330 [mlx5_ib]\n  ? __pollwait+0xd0/0xd0\n  ? xas_load+0x5/0x70\n  ? xa_load+0x62/0xa0\n  destroy_hw_idr_uobject+0x20/0x80 [ib_uverbs]\n  uverbs_destroy_uobject+0x3b/0x360 [ib_uverbs]\n  uobj_destroy+0x54/0xa0 [ib_uverbs]\n  ib_uverbs_cmd_verbs+0xaf2/0x1160 [ib_uverbs]\n  ? uverbs_finalize_object+0xd0/0xd0 [ib_uverbs]\n  ib_uverbs_ioctl+0xc4/0x1b0 [ib_uverbs]\n  __x64_sys_ioctl+0x3e4/0x8e0","published":"2024-04-10T19:15:48.000Z","lastModified":"2026-08-04T10:16:52.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":["linux/linux kernel"],"epss":{"score":0.00236,"percentile":0.1446,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/2ae38157080616a13a9fe3f0b4b6ec0070aa408a","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/471c492890557bd58f73314bb4ad85d5a8fd5026","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/76ded29d3fcda4928da8849ffc446ea46871c1c2","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2ae38157080616a13a9fe3f0b4b6ec0070aa408a","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/471c492890557bd58f73314bb4ad85d5a8fd5026","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/76ded29d3fcda4928da8849ffc446ea46871c1c2","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-47197","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}