{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-28688 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-28688 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 6 Apr 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-2021-28688 and fix it if it is affected.\n\nWhat it is: CVE-2021-28688 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 6 Apr 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-2021-28688 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-2021-28688/ (Markdown: https://insights.sbomify.com/CVE-2021-28688/index.md)","id":"CVE-2021-28688","markdown":"https://insights.sbomify.com/CVE-2021-28688/index.md","name":"CVE-2021-28688","record":{"aliases":["DEBIAN-CVE-2021-28688","GHSA-hqhv-rx9w-cr56","SUSE-SU-2021:1341-1","SUSE-SU-2022:1003-1","UBUNTU-CVE-2021-28688"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A regression in the Linux kernel's Xen grant table cleanup logic causes resource leaks and zombie domains, leading to denial of service and potential information disclosure.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"XEN","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":6.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-665","name":"Improper Initialization"}],"description":"The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.","ecosystems":["SUSE:Linux Enterprise Server 12 SP3-LTSS","SUSE:Linux Enterprise Server for SAP Applications 12 SP3"],"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":"Memory corruption in Linux","id":"CVE-2021-28688","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"memory_corruption","year":"2021"},"n_packages":4,"n_references":3,"next":{"headline":"Information disclosure in Xen","id":"CVE-2021-28689"},"packages":[{"ecosystem":"SUSE:Linux Enterprise Server 12 SP3-LTSS","fixed":["3-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_38","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_38\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS","source":"SUSE-SU-2021:1341-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP3-LTSS","fixed":["2-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_43","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_43\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS","source":"SUSE-SU-2022:1003-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP3","fixed":["3-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_38","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_38\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3","source":"SUSE-SU-2021:1341-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP3","fixed":["2-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_43","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_43\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3","source":"SUSE-SU-2022:1003-1"}],"prev":{"headline":"Null dereference in xen","id":"CVE-2021-28687"},"products":["Linux"],"published":"2021-04-06","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":"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":"2024-08-03","vendors":["Linux"]},"summary":"A regression in the Linux kernel's Xen grant table cleanup logic causes resource leaks and zombie domains, leading to denial of service and potential information disclosure.","url":"https://insights.sbomify.com/CVE-2021-28688/"}