Huawei EulerOS: CVE-2021-47589: kernel security update

Huawei EulerOS: CVE-2021-47589: kernel security update

Severity

7

CVSS

(AV:L/AC:L/Au:S/C:C/I:C/A:C)

Published

06/19/2024

Created

10/09/2024

Added

10/08/2024

Modified

01/28/2025

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

Solution(s)

• huawei-euleros-2_0_sp9-upgrade-kernel
• huawei-euleros-2_0_sp9-upgrade-kernel-tools
• huawei-euleros-2_0_sp9-upgrade-kernel-tools-libs
• huawei-euleros-2_0_sp9-upgrade-python3-perf

References

• https://attackerkb.com/topics/cve-2021-47589
• CVE - 2021-47589
• EulerOS-SA-2024-2394