- Vulnerability/
- CVE-2024-27066
CVE-2024-27066: virtio: packed: fix unmap leak for indirect desc table
First published: Wed May 01 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- 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://launchpad.net/bugs/cve/CVE-2024-27066
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-27066
- https://nvd.nist.gov/vuln/detail/CVE-2024-27066
- https://security-tracker.debian.org/tracker/CVE-2024-27066
- https://ubuntu.com/security/CVE-2024-27066
- https://git.kernel.org/linus/d5c0ed17fea60cca9bc3bf1278b49ba79242bbcd
Frequently Asked Questions
What is the severity of CVE-2024-27066?
CVE-2024-27066 has a medium severity rating due to potential information leakage and resource management issues in the Linux kernel.
How do I fix CVE-2024-27066?
To fix CVE-2024-27066, update the Linux kernel to the patched versions: 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
Which versions of Linux are affected by CVE-2024-27066?
CVE-2024-27066 affects various versions of the Linux kernel prior to the mentioned patched versions.
What impact does CVE-2024-27066 have on system performance?
CVE-2024-27066 could potentially impact system resource management, leading to decreased performance under specific configurations.
Is CVE-2024-27066 a remote or local vulnerability?
CVE-2024-27066 is primarily a local vulnerability, requiring access to the affected system to exploit.
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