{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-46983 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-46983 is a high-severity vulnerability in Linux kernel, published on 28 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-46983 and fix it if it is affected.\n\nWhat it is: CVE-2021-46983 is a high-severity vulnerability in Linux kernel, published on 28 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-46983 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-2021-46983/ (Markdown: https://insights.sbomify.com/CVE-2021-46983/index.md)","id":"CVE-2021-46983","markdown":"https://insights.sbomify.com/CVE-2021-46983/index.md","name":"CVE-2021-46983","record":{"aliases":["DEBIAN-CVE-2021-46983","GHSA-fxr5-32j9-7wfr","UBUNTU-CVE-2021-46983"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"A NULL pointer dereference in the Linux kernel's nvmet-rdma module allows a remote attacker to cause a system crash by triggering a specific RDMA error condition.","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":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-rdma: Fix NULL deref when SEND is completed with error\n\nWhen running some traffic and taking down the link on peer, a\nretry counter exceeded error is received. This leads to\nnvmet_rdma_error_comp which tried accessing the cq_context to\nobtain the queue. The cq_context is no longer valid after the\nfix to use shared CQ mechanism and should be obtained similar\nto how it is obtained in other functions from the wc-\u003eqp.\n\n[ 905.786331] nvmet_rdma: SEND for CQE 0x00000000e3337f90 failed with status transport retry counter exceeded (12).\n[ 905.832048] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048\n[ 905.839919] PGD 0 P4D 0\n[ 905.842464] Oops: 0000 1 SMP NOPTI\n[ 905.846144] CPU: 13 PID: 1557 Comm: kworker/13:1H Kdump: loaded Tainted: G OE --------- - - 4.18.0-304.el8.x86_64 #1\n[ 905.872135] RIP: 0010:nvmet_rdma_error_comp+0x5/0x1b [nvmet_rdma]\n[ 905.878259] Code: 19 4f c0 e8 89 b3 a5 f6 e9 5b e0 ff ff 0f b7 75 14 4c 89 ea 48 c7 c7 08 1a 4f c0 e8 71 b3 a5 f6 e9 4b e0 ff ff 0f 1f 44 00 00 \u003c48\u003e 8b 47 48 48 85 c0 74 08 48 89 c7 e9 98 bf 49 00 e9 c3 e3 ff ff\n[ 905.897135] RSP: 0018:ffffab601c45fe28 EFLAGS: 00010246\n[ 905.902387] RAX: 0000000000000065 RBX: ffff9e729ea2f800 RCX: 0000000000000000\n[ 905.909558] RDX: 0000000000000000 RSI: ffff9e72df9567c8 RDI: 0000000000000000\n[ 905.916731] RBP: ffff9e729ea2b400 R08: 000000000000074d R09: 0000000000000074\n[ 905.923903] R10: 0000000000000000 R11: ffffab601c45fcc0 R12: 0000000000000010\n[ 905.931074] R13: 0000000000000000 R14: 0000000000000010 R15: ffff9e729ea2f400\n[ 905.938247] FS: 0000000000000000(0000) GS:ffff9e72df940000(0000) knlGS:0000000000000000\n[ 905.938249] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 905.950067] nvmet_rdma: SEND for CQE 0x00000000c7356cca failed with status transport retry counter exceeded (12).\n[ 905.961855] CR2: 0000000000000048 CR3: 000000678d010004 CR4: 00000000007706e0\n[ 905.961855] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 905.961856] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 905.961857] PKRU: 55555554\n[ 906.010315] Call Trace:\n[ 906.012778] __ib_process_cq+0x89/0x170 [ib_core]\n[ 906.017509] ib_cq_poll_work+0x26/0x80 [ib_core]\n[ 906.022152] process_one_work+0x1a7/0x360\n[ 906.026182] ? create_worker+0x1a0/0x1a0\n[ 906.030123] worker_thread+0x30/0x390\n[ 906.033802] ? create_worker+0x1a0/0x1a0\n[ 906.037744] kthread+0x116/0x130\n[ 906.040988] ? kthread_flush_work_fn+0x10/0x10\n[ 906.045456] ret_from_fork+0x1f/0x40","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":"nvmet-rdma: Fix NULL deref when SEND is completed with error","id":"CVE-2021-46983","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":4,"next":{"headline":"kyber: fix out of bounds access when preempted","id":"CVE-2021-46984"},"packages":[],"prev":{"headline":"f2fs: compress: fix race condition of overwrite vs truncate","id":"CVE-2021-46982"},"products":["Linux"],"published":"2024-02-28","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A NULL pointer dereference in the Linux kernel's nvmet-rdma module allows a remote attacker to cause a system crash by triggering a specific RDMA error condition.","url":"https://insights.sbomify.com/CVE-2021-46983/"}