AZL-67779
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-67779.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-67779
- Upstream
- Published
- 2025-01-11T15:15:07Z
- Modified
- 2026-04-01T05:21:16.805116Z
- Summary
- CVE-2024-57843 affecting package kernel 5.15.200.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
virtio-net: fix overflow inside virtnetrqalloc
When the frag just got a page, then may lead to regression on VM. Specially if the sysctl net.core.highorderalloc_disable value is 1, then the frag always get a page when do refill.
Which could see reliable crashes or scp failure (scp a file 100M in size to VM).
The issue is that the virtnetrqdma takes up 16 bytes at the beginning of a new frag. When the frag size is larger than PAGESIZE, everything is fine. However, if the frag is only one page and the total size of the buffer and virtnetrq_dma is larger than one page, an overflow may occur.
The commit f9dac92ba908 ("virtioring: enable premapped mode whatever usedma_api") introduced this problem. And we reverted some commits to fix this in last linux version. Now we try to enable it and fix this bug directly.
Here, when the frag size is not enough, we reduce the buffer len to fix this problem.
- References