CVE-2024-44949: parisc: fix a possible DMA corruption
First published: Wed Sep 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: parisc: fix a possible DMA corruption ARCH_DMA_MINALIGN was defined as 16 - this is too small - it may be possible that two unrelated 16-byte allocations share a cache line. If one of these allocations is written using DMA and the other is written using cached write, the value that was written with DMA may be corrupted. This commit changes ARCH_DMA_MINALIGN to be 128 on PA20 and 32 on PA1.1 - that's the largest possible cache line size. As different parisc microarchitectures have different cache line size, we define arch_slab_minalign(), cache_line_size() and dma_get_cache_alignment() so that the kernel may tune slab cache parameters dynamically, based on the detected cache line size.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <6.6.46 | |
| Linux kernel | >=6.7<6.10.5 | |
| Linux kernel | =6.11-rc1 |
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Reference Links
- https://git.kernel.org/stable/c/dadac97f066a67334268132c1e2d0fd599fbcbec
- https://git.kernel.org/stable/c/00baca74fb5879e5f9034b6156671301f500f8ee
- https://git.kernel.org/stable/c/642a0b7453daff0295310774016fcb56d1f5bc7f
- https://git.kernel.org/stable/c/533de2f470baac40d3bf622fe631f15231a03c9f
- https://git.kernel.org/stable/c/7ae04ba36b381bffe2471eff3a93edced843240f
- https://git.kernel.org/stable/c/3dfd8991ad33b10c2fb027a4cfcf57579fa786c1
Frequently Asked Questions
What is the severity of CVE-2024-44949?
CVE-2024-44949 is considered a medium severity vulnerability due to potential DMA corruption.
How do I fix CVE-2024-44949?
To fix CVE-2024-44949, update your Linux kernel to a version that includes the patch for this vulnerability.
Which Linux kernel versions are affected by CVE-2024-44949?
CVE-2024-44949 affects Linux kernel versions prior to 6.7, between 6.7 and 6.10.5, and the specific version 6.11-rc1.
What are the potential impacts of CVE-2024-44949?
The potential impacts of CVE-2024-44949 include system instability and data corruption due to cache line sharing.
Is CVE-2024-44949 specific to any architecture?
Yes, CVE-2024-44949 is specifically noted for affecting the parisc architecture in the Linux kernel.
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