CVE-2023-52492
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.
Does this matter?
Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.27% probability · 19th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79Patch
- https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08Patch
- https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50bPatch
- https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0Patch
- https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17Patch
- https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7Patch
- https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79Patch
- https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08Patch
- https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50bPatch
- https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0Patch
- https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17Patch
- https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.