NULL Pointer Dereference Affecting kernel-rt-debug-core package, versions *
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUGCORE-6431041
- published 13 Mar 2024
- disclosed 29 Feb 2024
Introduced: 29 Feb 2024
CVE-2023-52492 Open this link in a new tabHow to fix?
There is no fixed version for Centos:8
kernel-rt-debug-core
.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-core
package and not the kernel-rt-debug-core
package as distributed by Centos
.
See How to fix?
for Centos:8
relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2023-52492
- https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79
- https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08
- https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b
- https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0
- https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17
- https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html