CVE-2023-52492

2024-03-1100:00:00

ubuntu.com

linux kernel

dmaengine

null pointer vulnerability

unregistration function

7.6 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

10.4%

JSON

In the Linux kernel, the following vulnerability has been resolved:
dmaengine: fix NULL pointer in channel unregistration function
__dma_async_device_channel_register() can fail. In case of failure,
chan->local is freed (with free_percpu()), and chan->local is nullified.
When dma_async_device_unregister() is called (because of managed API or
intentionally by DMA controller driver), channels are unconditionally
unregistered, leading to this NULL pointer: [ 1.318693] Unable to handle
kernel NULL pointer dereference at virtual address 00000000000000d0 […] [
1.484499] Call trace: [ 1.486930] device_del+0x40/0x394 [ 1.490314]
device_unregister+0x20/0x7c [ 1.494220]
__dma_async_device_channel_unregister+0x68/0xc0 Look at
dma_async_device_register() function error path, channel device
unregistration is done only if chan->local is not NULL. Then add the same
condition at the beginning of __dma_async_device_channel_unregister()
function, to avoid NULL pointer issue whatever the API used to reach this
function.

Notes

Author	Note
rodrigo-zaiden	USN-6765-1 for linux-oem-6.5 wrongly stated that this CVE was fixed in version 6.5.0-1022.23. The mentioned notice was revoked and the state of the fix for linux-oem-6.5 was recovered to the previous state.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< anyUNKNOWN
ubuntu20.04noarchlinux< anyUNKNOWN
ubuntu22.04noarchlinux< 5.15.0-106.116UNKNOWN
ubuntu23.10noarchlinux< 6.5.0-41.41UNKNOWN
ubuntu24.04noarchlinux< anyUNKNOWN
ubuntu14.04noarchlinux< anyUNKNOWN
ubuntu16.04noarchlinux< anyUNKNOWN
ubuntu18.04noarchlinux-aws< anyUNKNOWN
ubuntu20.04noarchlinux-aws< anyUNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1061.67UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< any	UNKNOWN
ubuntu	20.04	noarch	linux	< any	UNKNOWN
ubuntu	22.04	noarch	linux	< 5.15.0-106.116	UNKNOWN
ubuntu	23.10	noarch	linux	< 6.5.0-41.41	UNKNOWN
ubuntu	24.04	noarch	linux	< any	UNKNOWN
ubuntu	14.04	noarch	linux	< any	UNKNOWN
ubuntu	16.04	noarch	linux	< any	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< any	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< any	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1061.67	UNKNOWN