{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47127 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-47127 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47127 is a medium-severity vulnerability in Linux kernel, published on 15 Mar 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-2021-47127 and fix it if it is affected.\n\nWhat it is: CVE-2021-47127 is a medium-severity vulnerability in Linux kernel, published on 15 Mar 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-2021-47127 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-2021-47127/ (Markdown: https://insights.sbomify.com/CVE-2021-47127/index.md)","id":"CVE-2021-47127","markdown":"https://insights.sbomify.com/CVE-2021-47127/index.md","name":"CVE-2021-47127","record":{"aliases":["GHSA-wp5w-r3x6-pmqh","UBUNTU-CVE-2021-47127"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel driver","requires_auth":"low_privilege","summary":"A null pointer dereference in the Intel ice driver causes a kernel crash when using AF_XDP copy mode, leading to denial of service.","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":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nice: track AF_XDP ZC enabled queues in bitmap\n\nCommit c7a219048e45 (\"ice: Remove xsk_buff_pool from VSI structure\")\nsilently introduced a regression and broke the Tx side of AF_XDP in copy\nmode. xsk_pool on ice_ring is set only based on the existence of the XDP\nprog on the VSI which in turn picks ice_clean_tx_irq_zc to be executed.\nThat is not something that should happen for copy mode as it should use\nthe regular data path ice_clean_tx_irq.\n\nThis results in a following splat when xdpsock is run in txonly or l2fwd\nscenarios in copy mode:\n\n\u003csnip\u003e\n[  106.050195] BUG: kernel NULL pointer dereference, address: 0000000000000030\n[  106.057269] #PF: supervisor read access in kernel mode\n[  106.062493] #PF: error_code(0x0000) - not-present page\n[  106.067709] PGD 0 P4D 0\n[  106.070293] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[  106.074721] CPU: 61 PID: 0 Comm: swapper/61 Not tainted 5.12.0-rc2+ #45\n[  106.081436] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[  106.092027] RIP: 0010:xp_raw_get_dma+0x36/0x50\n[  106.096551] Code: 74 14 48 b8 ff ff ff ff ff ff 00 00 48 21 f0 48 c1 ee 30 48 01 c6 48 8b 87 90 00 00 00 48 89 f2 81 e6 ff 0f 00 00 48 c1 ea 0c \u003c48\u003e 8b 04 d0 48 83 e0 fe 48 01 f0 c3 66 66 2e 0f 1f 84 00 00 00 00\n[  106.115588] RSP: 0018:ffffc9000d694e50 EFLAGS: 00010206\n[  106.120893] RAX: 0000000000000000 RBX: ffff88984b8c8a00 RCX: ffff889852581800\n[  106.128137] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88984cd8b800\n[  106.135383] RBP: ffff888123b50001 R08: ffff889896800000 R09: 0000000000000800\n[  106.142628] R10: 0000000000000000 R11: ffffffff826060c0 R12: 00000000000000ff\n[  106.149872] R13: 0000000000000000 R14: 0000000000000040 R15: ffff888123b50018\n[  106.157117] FS:  0000000000000000(0000) GS:ffff8897e0f40000(0000) knlGS:0000000000000000\n[  106.165332] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  106.171163] CR2: 0000000000000030 CR3: 000000000560a004 CR4: 00000000007706e0\n[  106.178408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  106.185653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  106.192898] PKRU: 55555554\n[  106.195653] Call Trace:\n[  106.198143]  \u003cIRQ\u003e\n[  106.200196]  ice_clean_tx_irq_zc+0x183/0x2a0 [ice]\n[  106.205087]  ice_napi_poll+0x3e/0x590 [ice]\n[  106.209356]  __napi_poll+0x2a/0x160\n[  106.212911]  net_rx_action+0xd6/0x200\n[  106.216634]  __do_softirq+0xbf/0x29b\n[  106.220274]  irq_exit_rcu+0x88/0xc0\n[  106.223819]  common_interrupt+0x7b/0xa0\n[  106.227719]  \u003c/IRQ\u003e\n[  106.229857]  asm_common_interrupt+0x1e/0x40\n\u003c/snip\u003e\n\nFix this by introducing the bitmap of queues that are zero-copy enabled,\nwhere each bit, corresponding to a queue id that xsk pool is being\nconfigured on, will be set/cleared within ice_xsk_pool_{en,dis}able and\nchecked within ice_xsk_pool(). The latter is a function used for\ndeciding which napi poll routine is executed.\nIdea is being taken from our other drivers such as i40e and ixgbe.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"ice: track AF_XDP ZC enabled queues in bitmap","id":"CVE-2021-47127","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":"bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks","id":"CVE-2021-47128"},"packages":[],"prev":{"headline":"ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions","id":"CVE-2021-47126"},"products":["Linux"],"published":"2024-03-15","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":"2026-05-11","vendors":["Linux"]},"summary":"A null pointer dereference in the Intel ice driver causes a kernel crash when using AF_XDP copy mode, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2021-47127/"}