{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47481 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47481 is a medium-severity vulnerability in Linux kernel, published on 22 May 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47481 and fix it if it is affected.\n\nWhat it is: CVE-2021-47481 is a medium-severity vulnerability in Linux kernel, published on 22 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-47481 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-47481/ (Markdown: https://insights.sbomify.com/CVE-2021-47481/index.md)","id":"CVE-2021-47481","markdown":"https://insights.sbomify.com/CVE-2021-47481/index.md","name":"CVE-2021-47481","record":{"aliases":["DEBIAN-CVE-2021-47481","GHSA-7ghc-chxp-5r47","UBUNTU-CVE-2021-47481"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A missing initialization in the Linux kernel RDMA driver causes a null pointer dereference and system crash when deregistering memory regions.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Initialize the ODP xarray when creating an ODP MR\n\nNormally the zero fill would hide the missing initialization, but an\nerrant set to desc_size in reg_create() causes a crash:\n\n  BUG: unable to handle page fault for address: 0000000800000000\n  PGD 0 P4D 0\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 890 Comm: ib_write_bw Not tainted 5.15.0-rc4+ #47\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n  RIP: 0010:mlx5_ib_dereg_mr+0x14/0x3b0 [mlx5_ib]\n  Code: 48 63 cd 4c 89 f7 48 89 0c 24 e8 37 30 03 e1 48 8b 0c 24 eb a0 90 0f 1f 44 00 00 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 30 \u003c48\u003e 8b 2f 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 8b 87 c8\n  RSP: 0018:ffff88811afa3a60 EFLAGS: 00010286\n  RAX: 000000000000001c RBX: 0000000800000000 RCX: 0000000000000000\n  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000800000000\n  RBP: 0000000800000000 R08: 0000000000000000 R09: c0000000fffff7ff\n  R10: ffff88811afa38f8 R11: ffff88811afa38f0 R12: ffffffffa02c7ac0\n  R13: 0000000000000000 R14: ffff88811afa3cd8 R15: ffff88810772fa00\n  FS:  00007f47b9080740(0000) GS:ffff88852cd40000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000800000000 CR3: 000000010761e003 CR4: 0000000000370ea0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n   mlx5_ib_free_odp_mr+0x95/0xc0 [mlx5_ib]\n   mlx5_ib_dereg_mr+0x128/0x3b0 [mlx5_ib]\n   ib_dereg_mr_user+0x45/0xb0 [ib_core]\n   ? xas_load+0x8/0x80\n   destroy_hw_idr_uobject+0x1a/0x50 [ib_uverbs]\n   uverbs_destroy_uobject+0x2f/0x150 [ib_uverbs]\n   uobj_destroy+0x3c/0x70 [ib_uverbs]\n   ib_uverbs_cmd_verbs+0x467/0xb00 [ib_uverbs]\n   ? uverbs_finalize_object+0x60/0x60 [ib_uverbs]\n   ? ttwu_queue_wakelist+0xa9/0xe0\n   ? pty_write+0x85/0x90\n   ? file_tty_write.isra.33+0x214/0x330\n   ? process_echoes+0x60/0x60\n   ib_uverbs_ioctl+0xa7/0x110 [ib_uverbs]\n   __x64_sys_ioctl+0x10d/0x8e0\n   ? vfs_write+0x17f/0x260\n   do_syscall_64+0x3c/0x80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nAdd the missing xarray initialization and remove the desc_size set.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR","id":"CVE-2021-47481","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"net: batman-adv: fix error handling","id":"CVE-2021-47482"},"packages":[],"prev":{"headline":"scsi: core: Put LLD module refcnt after SCSI device is released","id":"CVE-2021-47480"},"products":["Linux"],"published":"2024-05-22","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-23","vendors":["Linux"]},"summary":"A missing initialization in the Linux kernel RDMA driver causes a null pointer dereference and system crash when deregistering memory regions.","url":"https://insights.sbomify.com/CVE-2021-47481/"}