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CVE-2026-123876ModerateLocalRevised 13 Nov

Mariner · CWE-184: Incomplete List of Disallowed Inputs

No KEV listing collectedCVSS 4.4Fix not stated
MSRC advisory NVD CVE.org

Assessment

Podman: containers-common: containers-common: default seccomp af_vsock/netlink_audit deny rules bypassable via 32-bit truncation

Severity
Moderate
CVSS base score
4.4
Impact
Not stated
Exploitation detected
Unknown: not stated by MSRC
Exploitability
Not assessed
Publicly disclosed
Unknown: not stated by MSRC
EPSS · 30-day forecast
No EPSS score collected
Customer action
Required: follow the MSRC remediation guidance
More details
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Mariner
Weakness
CWE-184: Incomplete List of Disallowed Inputs
Issued by
redhat
Published
11 Nov 2026 · November 2026
Last revised
13 Nov 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
LocalAV:L
Attack complexity
LowAC:L
Privileges required
LowPR:L
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
LowC:L
Integrity
LowI:L
Availability
NoneA:N

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Mariner, Open Source Software
4 affected products
  • azl3 kubevirt 1.8.4-4 on Azure Linux 3.0
  • azl3 kubevirt 1.8.4-5 on Azure Linux 3.0
  • azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0
  • azl3 libcontainers-common 20240213-3 on Azure Linux 3.0

What changed

  1. Affected products: azl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0 → azl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt 1.8.4-5 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0
  2. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  3. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  4. Affected products: azl3 libcontainers-common 20240213-3 on Azure Linux 3.0 → azl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (12)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 14 Nov 2026 · 08:16:23 UTC Last revised12 Nov 2026 01:48 UTC → 13 Nov 2026 14:46 UTC
  2. 14 Nov 2026 · 08:16:23 UTC Affected productsazl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0 → azl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt 1.8.4-5 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0
  3. 13 Nov 2026 · 12:10:20 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. 13 Nov 2026 · 12:10:20 UTC Source coverage: public-exploit-codeIncomplete → Current
  5. 13 Nov 2026 · 12:10:20 UTC Source coverage: first-epssIncomplete → Current
  6. 13 Nov 2026 · 12:10:20 UTC Source coverage: msrc-cvrfIncomplete → Current
  7. 13 Nov 2026 · 11:07:20 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  8. 13 Nov 2026 · 11:07:20 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  9. 13 Nov 2026 · 11:07:20 UTC Source coverage: first-epssCurrent → Incomplete
  10. 13 Nov 2026 · 11:07:20 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  11. 12 Nov 2026 · 09:04:19 UTC Last revised11 Nov 2026 01:06 UTC → 12 Nov 2026 01:48 UTC
  12. 12 Nov 2026 · 09:04:19 UTC Affected productsazl3 libcontainers-common 20240213-3 on Azure Linux 3.0 → azl3 kubevirt 1.8.4-4 on Azure Linux 3.0, azl3 kubevirt-openvmm 1.9.0-1 on Azure Linux 3.0, azl3 libcontainers-common 20240213-3 on Azure Linux 3.0

Explore global source statements, affected packages and advisory history for CVE-2026-123876. The catalog has a separate collection scope from Microsoft release records.

More advisories, affected versions and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

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cve-program · CVE-2026-123876

Published

Podman: containers-common: containers-common: default seccomp af_vsock/netlink_audit deny rules bypassable via 32-bit truncation

A flaw was found in the default seccomp profile used by Podman via containers-common. Deny rules for AF_VSOCK and NETLINK_AUDIT compared socket arguments with unmasked 64-bit equality. Because the kernel truncates those int arguments to 32 bits, setting upper bits can bypass the deny rules.

Source published
6 Nov 2026 17:38:41 UTC
Source modified
13 Nov 2026 13:30:43 UTC
Saved here
13 Nov 2026 14:56:54 UTC
Source terms
CVE Program Terms of Use

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CVSS 3.1 · 4.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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