vulnerability
Ubuntu: (CVE-2021-47633): linux vulnerability
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
7 | (AV:L/AC:L/Au:S/C:C/I:C/A:C) | Feb 26, 2025 | Mar 3, 2025 | Jun 10, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
ath5k: fix OOB in ath5k_eeprom_read_pcal_info_5111
The bug was found during fuzzing. Stacktrace locates it in
ath5k_eeprom_convert_pcal_info_5111.
When none of the curve is selected in the loop, idx can go
up to AR5K_EEPROM_N_PD_CURVES. The line makes pd out of bound.
pd = &chinfo[pier].pd_curves[idx];
There are many OOB writes using pd later in the code. So I
added a sanity check for idx. Checks for other loops involving
AR5K_EEPROM_N_PD_CURVES are not needed as the loop index is not
used outside the loops.
The patch is NOT tested with real device.
The following is the fuzzing report
BUG: KASAN: slab-out-of-bounds in ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
Write of size 1 at addr ffff8880174a4d60 by task modprobe/214
CPU: 0 PID: 214 Comm: modprobe Not tainted 5.6.0 #1
Call Trace:
dump_stack+0x76/0xa0
print_address_description.constprop.0+0x16/0x200
? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
__kasan_report.cold+0x37/0x7c
? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
kasan_report+0xe/0x20
ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
? apic_timer_interrupt+0xa/0x20
? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]
? ath5k_pci_eeprom_read+0x228/0x3c0 [ath5k]
ath5k_eeprom_init+0x2513/0x6290 [ath5k]
? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]
? usleep_range+0xb8/0x100
? apic_timer_interrupt+0xa/0x20
? ath5k_eeprom_read_pcal_info_2413+0x2f20/0x2f20 [ath5k]
ath5k_hw_init+0xb60/0x1970 [ath5k]
ath5k_init_ah+0x6fe/0x2530 [ath5k]
? kasprintf+0xa6/0xe0
? ath5k_stop+0x140/0x140 [ath5k]
? _dev_notice+0xf6/0xf6
? apic_timer_interrupt+0xa/0x20
ath5k_pci_probe.cold+0x29a/0x3d6 [ath5k]
? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]
? mutex_lock+0x89/0xd0
? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]
local_pci_probe+0xd3/0x160
pci_device_probe+0x23f/0x3e0
? pci_device_remove+0x280/0x280
? pci_device_remove+0x280/0x280
really_probe+0x209/0x5d0
Solution(s)
References
- CVE-2021-47633
- https://attackerkb.com/topics/CVE-2021-47633
- URL-https://git.kernel.org/linus/564d4eceb97eaf381dd6ef6470b06377bb50c95a
- URL-https://git.kernel.org/stable/c/25efc5d03455c3839249bc77fce5e29ecb54677e
- URL-https://git.kernel.org/stable/c/564d4eceb97eaf381dd6ef6470b06377bb50c95a
- URL-https://git.kernel.org/stable/c/9d7d83d0399e23d66fd431b553842a84ac10398f
- URL-https://git.kernel.org/stable/c/be2f81024e7981565d90a4c9ca3067d11b6bca7f
- URL-https://git.kernel.org/stable/c/c4e2f577271e158d87a916afb4e87415a88ce856
- URL-https://git.kernel.org/stable/c/cbd96d6cad6625feba9c8d101ed4977d53e82f8e
- URL-https://git.kernel.org/stable/c/ed3dfdaa8b5f0579eabfc1c5818eed30cfe1fe84
- URL-https://git.kernel.org/stable/c/f4de974019a0adf34d0e7de6b86252f1bd266b06
- URL-https://git.kernel.org/stable/c/fc8f7752a82f4accb99c0f1a868906ba1eb7b86f
- URL-https://www.cve.org/CVERecord?id=CVE-2021-47633

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