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CVE-2024-27066

Disclosure Date: May 01, 2024 •
CVE-2024-27066
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Description

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.

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General Information

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OS
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Vulnerable Versions
Linux e142169aca55
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis