{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-121876 in the wild and no public exploit code.","exposure":"An affected version is exposed as installed. No special setting or call is needed.","fix":"No fix has been published for CVE-2026-121876 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-121876 is a high-severity security feature bypass vulnerability in Red Hat Enterprise Linux 10, published on 12 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-121876 and fix it if it is affected.\n\nWhat it is: CVE-2026-121876 is a high-severity security feature bypass vulnerability in Red Hat Enterprise Linux 10, published on 12 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-121876 in the wild and no public exploit code.\nExposure: An affected version is exposed as installed. No special setting or call is needed.\n\nAffected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-121876/ (Markdown: https://insights.sbomify.com/CVE-2026-121876/index.md)","id":"CVE-2026-121876","markdown":"https://insights.sbomify.com/CVE-2026-121876/index.md","name":"CVE-2026-121876","record":{"aliases":["GHSA-pvr5-j3rg-w9p8"],"analysis":{"component_type":"container_or_infrastructure","exploitable_when_present":false,"fix_type":"no_fix_stated","impacts":["data_read","security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"confidential computing sandbox","requires_auth":"high_privilege","requires_specific_call":false,"summary":"A malicious host can inject swap partitions into confidential guest VMs, leaking TEE-encrypted memory to the host; confidential computing users should care.","user_interaction":"not_required","vuln_class":"security_feature_bypass","vulnerable_functions":[]},"analysis_generated_by":"sbomify/insights-2b-fp8","assigner":"redhat","cpe":[],"cvss":{"score":7.9,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-359","name":"Exposure of Private Personal Information to an Unauthorized Actor"}],"description":"A flaw was found in the interaction between systemd-gpt-auto-generator and \nconfidential computing guest VM images in OpenShift Sandboxed Containers \n(confidential peer pods). systemd-gpt-auto-generator automatically discovers \nand mounts GPT partitions by type GUID at boot with no user confirmation. In \nthe confidential computing threat model, where the host/hypervisor is the \nadversary, a malicious host can inject partitions into the guest's virtual \ndisk. Most critically, injecting a swap partition causes the guest kernel to \npage out TEE-encrypted memory to a host-controlled block device, breaking the \nconfidentiality guarantee of the hardware TEE (AMD SEV-SNP, Intel TDX).\n\nThe PodVM images use a GPT-partitioned disk with dm-verity on the root \npartition. However, the roothash= kernel parameter only disables root \nauto-discovery — non-root partitions (swap, /home, /var, /srv, /var/tmp) are \nstill auto-discovered and mounted. The generator is shipped unmasked in the \nRHEL systemd-udev subpackage, and no kernel command line parameter in the \nmeasured UKI addon disables it. Additionally, the PodVM measurement script \ncaptures PCRs 3, 9, 11, and 12, but not PCR 5 (GPT partition table), so \npartition table modifications are not detected by remote attestation.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Security feature bypass in Red Hat Enterprise Linux 10","id":"CVE-2026-121876","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"RStudio Server / Posit Workbench localhost port-proxy does not enforce per-session port ownership","id":"CVE-2026-121880"},"nickname":null,"packages":[],"prev":{"headline":"Post Duplicator \u003c 3.0.18 - Admin+ Privilege Escalation via Unvalidated Capability Assignment","id":"CVE-2026-121875"},"products":["Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9","Red Hat OpenShift Container Platform 4","Red Hat OpenShift Container Platform 5"],"published":"2026-11-12","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-12","vendors":["Red Hat"]},"summary":"A malicious host can inject swap partitions into confidential guest VMs, leaking TEE-encrypted memory to the host; confidential computing users should care.","url":"https://insights.sbomify.com/CVE-2026-121876/"}