SARA / Free Tools / CVE / CVE-2023-6693

CVE-2023-6693 — A stack based buffer overflow was found in the virtio-net device of QEMU

A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. This could allow a malicious use

CVSS
4.9 MEDIUM
EPSS
0.03% (top 93.50%)
CWE
CWE-121
Published
2024-01-02T09:15:08.280Z
Last modified
2026-02-25T18:20:08.475Z
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

01What is this vulnerability?

A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. This could allow a malicious user to overwrite local variables allocated on the stack. Specifically, the `out_sg` variable could be used to read a part…

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 88100020240314161907.e155f54d
Red HatRed Hat Enterprise Linux 88100020240314161907.e155f54d
Red HatRed Hat Enterprise Linux 917:9.0.0-10.el9_5.3
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 8 Advanced Virtualizationunspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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