Security readout for executives and security teams
Plain-English summary
CVE-2023-6693 is a QEMU virtio-net bug that can let a malicious guest influence stack memory during transmit flushing. The reported business risk is limited but real: possible host process memory disclosure and small integrity or availability impact on virtualization infrastructure using affected packages.
Executive priority
Treat as a moderate virtualization-platform maintenance issue. It is not presented as actively exploited, but affected hypervisor hosts should be patched through normal security update windows, with faster handling for shared or untrusted guest environments.
Technical view
The flaw is a stack-based buffer overflow in QEMU virtio_net_flush_tx(). It occurs when VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1, and VIRTIO_NET_F_MRG_RXBUF are enabled. Sources describe potential stack local-variable overwrite, especially involving out_sg, which may leak QEMU process memory to the network.
Likely exposure
Most likely exposure is virtualization hosts running affected qemu-kvm or virt packages with virtio-net guests. The bundle identifies affected Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, and Red Hat Enterprise Linux 8 Advanced Virtualization packages. Red Hat Enterprise Linux 6 and 7 entries are listed as unknown.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source here establishes active exploitation. The CVSS vector is local with high attack complexity, suggesting exploitation depends on a specific guest and feature configuration rather than broad remote reachability.
Researcher notes
Key conditions are the virtio-net device path and simultaneous guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1, and VIRTIO_NET_F_MRG_RXBUF. Validate exposure through package state and VM network configuration. Avoid assuming product impact beyond the listed advisories and affected package data.
Mitigation direction
- Apply relevant vendor updates from Red Hat, Fedora, Debian, NetApp, or platform support channels.
- Prioritize exposed multi-tenant or less-trusted virtualization hosts using virtio-net.
- Check vendor guidance for RHEL 6 and 7 because their status is unknown in the bundle.
- Review guest feature negotiation and virtio-net usage where immediate patching is delayed.
Validation and detection
- Inventory QEMU, qemu-kvm, and virt package versions on virtualization hosts.
- Confirm whether affected hosts use virtio-net for guest networking.
- Check whether vendor advisories apply to each OS or appliance platform.
- Verify remediation by confirming installed package versions match vendor fixed errata.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-6693 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L1.43.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2024:2962CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2025:4492CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2023-6693CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2254580CVE reference · issue-tracking, x_refsource_REDHAT
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/CVE reference · x_transferred
- https://security.netapp.com/advisory/ntap-20240208-0004/CVE reference · x_transferred
- https://lists.debian.org/debian-lts-announce/2025/04/msg00042.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.