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Red Hat

CVE-2026-123876: 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 u

CVE-2026-123876 Nov 6, 2026 Source: Vendor

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 of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-123876
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Credited

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CVE-2026-123876 BR2026-0000-043044 unclaimed
Credited as Red Hat would like to thank Ricardo Branco (SUSE) for reporting this issue