{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-47589", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47589", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-06-19T14:53:53.565Z", "updatedAt": "2026-05-11T13:57:27.931Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "igbvf: fix double free in `igbvf_probe`", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nigbvf: fix double free in `igbvf_probe`\n\nIn `igbvf_probe`, if register_netdev() fails, the program will go to\nlabel err_hw_init, and then to label err_ioremap. In free_netdev() which\nis just below label err_ioremap, there is `list_for_each_entry_safe` and\n`netif_napi_del` which aims to delete all entries in `dev->napi_list`.\nThe program has added an entry `adapter->rx_ring->napi` which is added by\n`netif_napi_add` in igbvf_alloc_queues(). However, adapter->rx_ring has\nbeen freed below label err_hw_init. So this a UAF.\n\nIn terms of how to patch the problem, we can refer to igbvf_remove() and\ndelete the entry before `adapter->rx_ring`.\n\nThe KASAN logs are as follows:\n\n[ 35.126075] BUG: KASAN: use-after-free in free_netdev+0x1fd/0x450\n[ 35.127170] Read of size 8 at addr ffff88810126d990 by task modprobe/366\n[ 35.128360]\n[ 35.128643] CPU: 1 PID: 366 Comm: modprobe Not tainted 5.15.0-rc2+ #14\n[ 35.129789] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014\n[ 35.131749] Call Trace:\n[ 35.132199] dump_stack_lvl+0x59/0x7b\n[ 35.132865] print_address_description+0x7c/0x3b0\n[ 35.133707] ? free_netdev+0x1fd/0x450\n[ 35.134378] __kasan_report+0x160/0x1c0\n[ 35.135063] ? free_netdev+0x1fd/0x450\n[ 35.135738] kasan_report+0x4b/0x70\n[ 35.136367] free_netdev+0x1fd/0x450\n[ 35.137006] igbvf_probe+0x121d/0x1a10 [igbvf]\n[ 35.137808] ? igbvf_vlan_rx_add_vid+0x100/0x100 [igbvf]\n[ 35.138751] local_pci_probe+0x13c/0x1f0\n[ 35.139461] pci_device_probe+0x37e/0x6c0\n[ 35.165526]\n[ 35.165806] Allocated by task 366:\n[ 35.166414] ____kasan_kmalloc+0xc4/0xf0\n[ 35.167117] foo_kmem_cache_alloc_trace+0x3c/0x50 [igbvf]\n[ 35.168078] igbvf_probe+0x9c5/0x1a10 [igbvf]\n[ 35.168866] local_pci_probe+0x13c/0x1f0\n[ 35.169565] pci_device_probe+0x37e/0x6c0\n[ 35.179713]\n[ 35.179993] Freed by task 366:\n[ 35.180539] kasan_set_track+0x4c/0x80\n[ 35.181211] kasan_set_free_info+0x1f/0x40\n[ 35.181942] ____kasan_slab_free+0x103/0x140\n[ 35.182703] kfree+0xe3/0x250\n[ 35.183239] igbvf_probe+0x1173/0x1a10 [igbvf]\n[ 35.184040] local_pci_probe+0x13c/0x1f0", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "ffe1695b678729edec04037e691007900a2b2beb" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "79d9b092035dcdbe636b70433149df9cc6db1e49" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "8d0c927a9fb2b4065230936b77b54f857a3754fc" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "cc9b655bb84f1be283293dfea94dff9a31b106ac" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "8addba6cab94ce01686ea2e80ed1530f9dc33a9a" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "74a16e062b23332d8db017ff4a41e16279c44411" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "944b8be08131f5faf2cd2440aa1c24a39a163a54" }, { "version": "d4e0fe01a38a073568aee541a0247fe734095979", "status": "affected", "versionType": "git", "lessThan": "b6d335a60dc624c0d279333b22c737faa765b028" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.30" }, { "version": "4.4.296", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.4.*" }, { "version": "4.9.294", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.259", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.222", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.168", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.88", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.16", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }