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TI-2023-06121 Aliases CVE-2023-6693GHSA-835p-c6x8-xh5f

Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()

Priority LOW 24CWE-121Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 3 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0033 26th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 3 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 8—8100020240314161907.e155f54dPatch availableCNA
Red HatRed Hat Enterprise Linux 8—8100020240314161907.e155f54dPatch availableCNA
Red HatRed Hat Enterprise Linux 9—17:9.0.0-10.el9_5.3Patch availableCNA
Red HatRed Hat Enterprise Linux 6——No fix listedCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
Red HatRed Hat Enterprise Linux 8 Advanced Virtualization——No fix listedCNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 8100020240314161907.e155f54d Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 8100020240314161907.e155f54d Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 17:9.0.0-10.el9_5.3 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 8 Advanced Virtualization VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*before 8.2.1VulnerableQEMU
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*39VulnerableFedoraproject
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions before 8.2.1 Vulnerable ·QEMU
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject

Remediation

Red Hat 2 advisories

  • RHSA-2025:4492 Released 2025-05-06 · Red Hat rating Moderate
    qemu-kvm security update
    • Red Hat Enterprise Linux AppStream (v. 9) qemu-guest-agent-17:9.0.0-10.el9_5.3, qemu-img-17:9.0.0-10.el9_5.3, qemu-kvm-17:9.0.0-10.el9_5.3 +17
  • RHSA-2024:2962 Released 2024-05-22 · Red Hat rating Moderate
    virt:rhel and virt-devel:rhel security and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20210217-2.module+el8.10.0+20141+6faa2812.noarch::virt:rhel, SLOF-20210217-2.module+el8.10.0+20141+6faa2812.src::virt:rhel, hivex-1.3.18-23.module+el8.9.0+18724+20190c23.aarch64::virt:rhel +47
    • Red Hat Enterprise Linux CRB (v. 8) SLOF-20210217-2.module+el8.10.0+20141+6faa2812.src::virt-devel:rhel, hivex-1.3.18-23.module+el8.9.0+18724+20190c23.i686::virt-devel:rhel, hivex-devel-1.3.18-23.module+el8.9.0+18724+20190c23.i686::virt-devel:rhel +47

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8 Advanced VirtualizationAffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2024:2962
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:4492
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2024:2962

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-6693
  2. 2026-10-03 Alias added: GHSA-835p-c6x8-xh5f

References

Patch 1

Advisory 3

  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences