UBUNTU-CVE-2024-27066
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.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
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35 explicit affected versions
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12 explicit affected versions
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12 explicit affected versions
37 explicit affected versions
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23 explicit affected versions
10 explicit affected versions
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7 explicit affected versions
12 explicit affected versions
10 explicit affected versions
26 explicit affected versions
6 explicit affected versions
6 explicit affected versions
13 explicit affected versions
5 explicit affected versions
16 explicit affected versions
6 explicit affected versions
3 explicit affected versions
51 explicit affected versions
3 explicit affected versions
12 explicit affected versions
27 explicit affected versions
8 explicit affected versions
5 explicit affected versions
8 explicit affected versions
10 explicit affected versions
2 explicit affected versions
13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
12 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
6 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
7 explicit affected versions
4 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
1 explicit affected versions
14 explicit affected versions
4 explicit affected versions
1 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
- 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
- https://ubuntu.com/security/CVE-2024-27066
- https://ubuntu.com/security/notices/USN-6816-1
- https://ubuntu.com/security/notices/USN-6817-1
- https://ubuntu.com/security/notices/USN-6817-2
- https://ubuntu.com/security/notices/USN-6817-3
- https://ubuntu.com/security/notices/USN-6878-1
- https://www.cve.org/CVERecord?id=CVE-2024-27066