CVE-2024-27066 Affecting kernel-rt package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRT-6802689
- published 2 May 2024
- disclosed 1 May 2024
Introduced: 1 May 2024
CVE-2024-27066 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
virtio: packed: fix unmap leak for indirect desc table
When use_dma_api and premapped are true, then the do_unmap is false.
Because the do_unmap is false, vring_unmap_extra_packed is not called by detach_buf_packed.
if (unlikely(vq->do_unmap)) { curr = id; for (i = 0; i < state->num; i++) { vring_unmap_extra_packed(vq, &vq->packed.desc_extra[curr]); curr = vq->packed.desc_extra[curr].next; } }
So the indirect desc table is not unmapped. This causes the unmap leak.
So here, we check vq->use_dma_api instead. Synchronously, dma info is updated based on use_dma_api judgment
This bug does not occur, because no driver use the premapped with indirect.
References
- https://access.redhat.com/security/cve/CVE-2024-27066
- https://git.kernel.org/stable/c/51bacd9d29bf98c3ebc65e4a0477bb86306b4140
- https://git.kernel.org/stable/c/75450ff8c6fe8755bf5b139b238eaf9739cfd64e
- https://git.kernel.org/stable/c/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
- https://git.kernel.org/stable/c/e142169aca5546ae6619c39a575cda8105362100