# CVE-2024-27066: linux: In the Linux kernel, the following vulnerability has been resolved:  virtio: packed: fix unmap leak for indirect desc...

CVE-2024-27066 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-27066, released May 1, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-27066
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0060
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-27066](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27066.md) | May 1, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-27066](https://patchblox.com/security/data/fix/linux/debian-cve-2024-27066.md) | May 1, 2024 |

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