{"id":"DEBIAN-CVE-2021-47589","details":"In the Linux kernel, the following vulnerability has been resolved:  igbvf: fix double free in `igbvf_probe`  In `igbvf_probe`, if register_netdev() fails, the program will go to label err_hw_init, and then to label err_ioremap. In free_netdev() which is just below label err_ioremap, there is `list_for_each_entry_safe` and `netif_napi_del` which aims to delete all entries in `dev-\u003enapi_list`. The program has added an entry `adapter-\u003erx_ring-\u003enapi` which is added by `netif_napi_add` in igbvf_alloc_queues(). However, adapter-\u003erx_ring has been freed below label err_hw_init. So this a UAF.  In terms of how to patch the problem, we can refer to igbvf_remove() and delete the entry before `adapter-\u003erx_ring`.  The KASAN logs are as follows:  [   35.126075] BUG: KASAN: use-after-free in free_netdev+0x1fd/0x450 [   35.127170] Read of size 8 at addr ffff88810126d990 by task modprobe/366 [   35.128360] [   35.128643] CPU: 1 PID: 366 Comm: modprobe Not tainted 5.15.0-rc2+ #14 [   35.129789] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [   35.131749] Call Trace: [   35.132199]  dump_stack_lvl+0x59/0x7b [   35.132865]  print_address_description+0x7c/0x3b0 [   35.133707]  ? free_netdev+0x1fd/0x450 [   35.134378]  __kasan_report+0x160/0x1c0 [   35.135063]  ? free_netdev+0x1fd/0x450 [   35.135738]  kasan_report+0x4b/0x70 [   35.136367]  free_netdev+0x1fd/0x450 [   35.137006]  igbvf_probe+0x121d/0x1a10 [igbvf] [   35.137808]  ? igbvf_vlan_rx_add_vid+0x100/0x100 [igbvf] [   35.138751]  local_pci_probe+0x13c/0x1f0 [   35.139461]  pci_device_probe+0x37e/0x6c0 [   35.165526] [   35.165806] Allocated by task 366: [   35.166414]  ____kasan_kmalloc+0xc4/0xf0 [   35.167117]  foo_kmem_cache_alloc_trace+0x3c/0x50 [igbvf] [   35.168078]  igbvf_probe+0x9c5/0x1a10 [igbvf] [   35.168866]  local_pci_probe+0x13c/0x1f0 [   35.169565]  pci_device_probe+0x37e/0x6c0 [   35.179713] [   35.179993] Freed by task 366: [   35.180539]  kasan_set_track+0x4c/0x80 [   35.181211]  kasan_set_free_info+0x1f/0x40 [   35.181942]  ____kasan_slab_free+0x103/0x140 [   35.182703]  kfree+0xe3/0x250 [   35.183239]  igbvf_probe+0x1173/0x1a10 [igbvf] [   35.184040]  local_pci_probe+0x13c/0x1f0","modified":"2026-09-15T09:02:36.028316079Z","published":"2024-06-19T15:15:53.490Z","upstream":["CVE-2021-47589"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47589"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47589.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47589.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47589.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}