Exploitation evidence
Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Red Hat / Red Hat Enterprise Linux 10
Default status: affected
Red Hat / Red Hat Enterprise Linux 8
Default status: affected
Red Hat / Red Hat Enterprise Linux 9
Default status: affected
Red Hat / Red Hat OpenShift Container Platform 4
Default status: affected
Red Hat / Red Hat OpenShift Container Platform 4
Default status: affected
Red Hat / Red Hat OpenShift Container Platform 4
Default status: affected
Red Hat / Red Hat OpenShift Container Platform 5
Default status: affected
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Reported workarounds: Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available. --- CME Mitigation Guidance (2026-11-04) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to clamp quoted IPv4 payload length to actual buffer bounds in libslirp icmp_forward_error before copying data into ICMP error responses: upgrade to the corresponding fixed Red Hat builds, which clamp s_ip_len to the source buffer length msrc->m_len before copying payload data into the ICMP error packet, closing crafted truncated IPv4 packets with ip_len exceeding mbuf length. Until patched, this is a concern on guests or containers transmitting network traffic through libslirp, so restrict untrusted guests or containers from transmitting network traffic across libslirp virtual network interfaces. These controls limit blast radius and contain exploitation, but they do not fix the underlying out-of-bounds heap read defect — apply the upstream patch to fully remediate.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://access.redhat.com/security/cve/CVE-2026-120830
- https://bugzilla.redhat.com/show_bug.cgi?id=2565424
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/21b33a6c5588af9f58d15e528fdc1019452708e4
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.00221,
"percentile": 0.12847
}11 Nov 2026, 12:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.00221,
"percentile": 0.12811
}11 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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