{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-27379 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-27379 is a high-severity vulnerability in Debian Debian Linux, published on 18 Feb 2021. 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-2021-27379 and fix it if it is affected.\n\nWhat it is: CVE-2021-27379 is a high-severity vulnerability in Debian Debian Linux, published on 18 Feb 2021. 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-2021-27379 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2021-27379/ (Markdown: https://insights.sbomify.com/CVE-2021-27379/index.md)","id":"CVE-2021-27379","markdown":"https://insights.sbomify.com/CVE-2021-27379/index.md","name":"CVE-2021-27379","record":{"aliases":["DEBIAN-CVE-2021-27379","GHSA-f444-f4gw-jhg6","SUSE-SU-2021:1250-1","SUSE-SU-2021:1268-1","UBUNTU-CVE-2021-27379"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["privilege_escalation","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Xen hypervisor","requires_auth":"low_privilege","summary":"Guest OS users can gain privileges or crash the host via incorrect IOMMU updates due to a missed flush in Xen.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"xen","vendor":"xen"}],"cvss":{"score":7.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct. NOTE: this issue exists because of an incomplete fix for CVE-2020-15565.","ecosystems":["SUSE:Linux Enterprise High Performance Computing 15-ESPOS","SUSE:Linux Enterprise High Performance Computing 15-LTSS","SUSE:Linux Enterprise Server 12 SP2-BCL","SUSE:Linux Enterprise Server for SAP Applications 15","SUSE:OpenStack Cloud 7"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Privilege escalation in n/a","id":"CVE-2021-27379","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","xen:xen"],"type":"privilege_escalation","year":"2021"},"n_packages":5,"n_references":4,"next":{"headline":"Memory corruption in Solid Edge SE2020","id":"CVE-2021-27380"},"packages":[{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15-ESPOS","fixed":["4.10.4_24-3.56.1"],"introduced":["0"],"last_affected":[],"package":"xen","purl":"pkg:rpm/suse/xen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOS","source":"SUSE-SU-2021:1250-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15-LTSS","fixed":["4.10.4_24-3.56.1"],"introduced":["0"],"last_affected":[],"package":"xen","purl":"pkg:rpm/suse/xen\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSS","source":"SUSE-SU-2021:1250-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-BCL","fixed":["4.7.6_14-43.76.1"],"introduced":["0"],"last_affected":[],"package":"xen","purl":"pkg:rpm/suse/xen\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCL","source":"SUSE-SU-2021:1268-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15","fixed":["4.10.4_24-3.56.1"],"introduced":["0"],"last_affected":[],"package":"xen","purl":"pkg:rpm/suse/xen\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015","source":"SUSE-SU-2021:1250-1"},{"ecosystem":"SUSE:OpenStack Cloud 7","fixed":["4.7.6_14-43.76.1"],"introduced":["0"],"last_affected":[],"package":"xen","purl":"pkg:rpm/suse/xen\u0026distro=SUSE%20OpenStack%20Cloud%207","source":"SUSE-SU-2021:1268-1"}],"prev":{"headline":"Incorrect check on buffer length in rand_core","id":"CVE-2021-27378"},"products":["n/a"],"published":"2021-02-18","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Guest OS users can gain privileges or crash the host via incorrect IOMMU updates due to a missed flush in Xen.","url":"https://insights.sbomify.com/CVE-2021-27379/"}