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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-47589

igbvf: fix double free in `igbvf_probe`

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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->napi_list`. The program has added an entry `adapter->rx_ring->napi` which is added by `netif_napi_add` in igbvf_alloc_queues(). However, adapter->rx_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->rx_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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d4e0fe01a38a073568aee541a0247fe734095979 to < ffe1695b678729edec04037e691007900a2b2bebaffected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < 79d9b092035dcdbe636b70433149df9cc6db1e49affected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < 8d0c927a9fb2b4065230936b77b54f857a3754fcaffected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < cc9b655bb84f1be283293dfea94dff9a31b106acaffected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < 8addba6cab94ce01686ea2e80ed1530f9dc33a9aaffected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < 74a16e062b23332d8db017ff4a41e16279c44411affected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < 944b8be08131f5faf2cd2440aa1c24a39a163a54affected
  • d4e0fe01a38a073568aee541a0247fe734095979 to < b6d335a60dc624c0d279333b22c737faa765b028affected

Linux Linux

Default version status: affected

  • 2.6.30affected
  • 0 to < 2.6.30unaffected
  • 4.4.296 to ≤ 4.4.*unaffected
  • 4.9.294 to ≤ 4.9.*unaffected
  • 4.14.259 to ≤ 4.14.*unaffected
  • 4.19.222 to ≤ 4.19.*unaffected
  • 5.4.168 to ≤ 5.4.*unaffected
  • 5.10.88 to ≤ 5.10.*unaffected
  • 5.15.11 to ≤ 5.15.*unaffected
  • 5.16 to ≤ *unaffected

References