{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2023-4623 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-4623 is a high-severity use after free vulnerability in Debian Debian Linux, published on 6 Sep 2023. 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-2023-4623 and fix it if it is affected.\n\nWhat it is: CVE-2023-4623 is a high-severity use after free vulnerability in Debian Debian Linux, published on 6 Sep 2023. 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-2023-4623 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-2023-4623/ (Markdown: https://insights.sbomify.com/CVE-2023-4623/index.md)","id":"CVE-2023-4623","markdown":"https://insights.sbomify.com/CVE-2023-4623/index.md","name":"CVE-2023-4623","record":{"aliases":["AZL-31697","BELL-CVE-2023-4623","DEBIAN-CVE-2023-4623","GHSA-j8c5-g64v-xj97","RHSA-2024:1747","SUSE-SU-2023:4164-1","SUSE-SU-2023:4204-1","SUSE-SU-2023:4208-1","SUSE-SU-2023:4244-1","SUSE-SU-2023:4278-1","SUSE-SU-2023:4300-1","SUSE-SU-2023:4313-1","SUSE-SU-2023:4321-1","SUSE-SU-2023:4328-1","UBUNTU-CVE-2023-4623"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free in the Linux kernel's HFSC qdisc allows local attackers to escalate privileges.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Google","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.\n\nIf a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.\n\nWe recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.","ecosystems":["Red Hat:rhel_aus:7.6::server","SUSE:Linux Enterprise Live Patching 12 SP5","SUSE:Linux Enterprise Live Patching 15 SP1","SUSE:Linux Enterprise Live Patching 15 SP2","SUSE:Linux Enterprise Live Patching 15 SP4","SUSE:Linux Enterprise Live Patching 15 SP5"],"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":"Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component","id":"CVE-2023-4623","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"use_after_free","year":"2023"},"n_packages":33,"n_references":5,"next":{"headline":"Server-Side Request Forgery (SSRF) in bookstackapp/bookstack","id":"CVE-2023-4624"},"packages":[{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-whitelists","purl":"pkg:rpm/redhat/kernel-abi-whitelists","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-x86_64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-x86_64","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/redhat/kernel-devel","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/redhat/kernel-doc","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools","purl":"pkg:rpm/redhat/kernel-tools","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-debuginfo","purl":"pkg:rpm/redhat/kernel-tools-debuginfo","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/redhat/kernel-tools-libs","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs-devel","purl":"pkg:rpm/redhat/kernel-tools-libs-devel","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/redhat/perf","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"perf-debuginfo","purl":"pkg:rpm/redhat/perf-debuginfo","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"python-perf","purl":"pkg:rpm/redhat/python-perf","source":"RHSA-2024:1747"},{"ecosystem":"Red Hat:rhel_aus:7.6::server","fixed":["0:3.10.0-957.112.1.el7"],"introduced":["0"],"last_affected":[],"package":"python-perf-debuginfo","purl":"pkg:rpm/redhat/python-perf-debuginfo","source":"RHSA-2024:1747"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["12-2.3"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_36","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_36\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4204-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["7-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_42","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_42\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4300-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["6-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_43","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_43\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4321-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["5-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_44","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_44\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4208-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["4-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_45","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_45\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4313-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP5","fixed":["3-2.2"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP5_Update_47","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_47\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5","source":"SUSE-SU-2023:4244-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP1","fixed":["12-150100.2.3"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP1_Update_35","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP1_Update_35\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP1","source":"SUSE-SU-2023:4244-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP1","fixed":["10-150100.2.3"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP1_Update_36","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP1_Update_36\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP1","source":"SUSE-SU-2023:4300-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP1","fixed":["5-150100.2.2"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP1_Update_41","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP1_Update_41\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP1","source":"SUSE-SU-2023:4278-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP1","fixed":["4-150100.2.2"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP1_Update_42","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP1_Update_42\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP1","source":"SUSE-SU-2023:4321-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP2","fixed":["3-150200.2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP2_Update_39","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP2_Update_39\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP2","source":"SUSE-SU-2023:4244-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP4","fixed":["2-150400.2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP4-RT_Update_13","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP4-RT_Update_13\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4","source":"SUSE-SU-2023:4164-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP4","fixed":["2-150400.2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP4_Update_18","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP4_Update_18\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4","source":"SUSE-SU-2023:4328-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP5","fixed":["2-150500.2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP5-RT_Update_5","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP5-RT_Update_5\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP5","source":"SUSE-SU-2023:4164-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15 SP5","fixed":["2-150500.2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15-SP5_Update_5","purl":"pkg:rpm/suse/kernel-livepatch-SLE15-SP5_Update_5\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP5","source":"SUSE-SU-2023:4328-1"}],"prev":{"headline":"Use-after-free in Linux kernel's af_unix component","id":"CVE-2023-4622"},"products":["Kernel"],"published":"2023-09-06","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":"Red Hat","prefix":"RHSA"},{"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["Linux"]},"summary":"A use-after-free in the Linux kernel's HFSC qdisc allows local attackers to escalate privileges.","url":"https://insights.sbomify.com/CVE-2023-4623/"}