Double Free Affecting python-perf package, versions <0:4.14.262-200.489.amzn2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-AMZN2-PYTHONPERF-7678835
- published14 Aug 2024
- disclosed19 Jun 2024
Introduced: 19 Jun 2024
CVE-2021-47589 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2 python-perf to version 0:4.14.262-200.489.amzn2 or higher.
This issue was patched in ALAS2-2022-1749.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-perf package and not the python-perf package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47589
- https://git.kernel.org/stable/c/74a16e062b23332d8db017ff4a41e16279c44411
- https://git.kernel.org/stable/c/79d9b092035dcdbe636b70433149df9cc6db1e49
- https://git.kernel.org/stable/c/8addba6cab94ce01686ea2e80ed1530f9dc33a9a
- https://git.kernel.org/stable/c/8d0c927a9fb2b4065230936b77b54f857a3754fc
- https://git.kernel.org/stable/c/944b8be08131f5faf2cd2440aa1c24a39a163a54
- https://git.kernel.org/stable/c/b6d335a60dc624c0d279333b22c737faa765b028
- https://git.kernel.org/stable/c/cc9b655bb84f1be283293dfea94dff9a31b106ac
- https://git.kernel.org/stable/c/ffe1695b678729edec04037e691007900a2b2beb