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CVE-2023-6693

Date: January 2, 2024

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 of process memory and send it to the wire, causing an information leak.

Language: C

Severity Score

Related Resources (9)

https://access.redhat.com/security/cve/CVE-2023-6693
https://bugzilla.redhat.com/show_bug.cgi?id=2254580
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/
https://access.redhat.com/errata/RHSA-2025:4492
https://access.redhat.com/errata/RHSA-2024:2962
https://nvd.nist.gov/vuln/detail/CVE-2023-6693
https://security.netapp.com/advisory/ntap-20240208-0004/
https://security-tracker.debian.org/tracker/CVE-2023-6693
https://www.mend.io/vulnerability-database/CVE-2023-6693

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Stack-based Buffer Overflow

CWE-121

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): LOW

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