{"api_version":"1","generated_at":"2026-04-22T23:52:20+00:00","cve":"CVE-2023-4623","urls":{"html":"https://cve.report/CVE-2023-4623","api":"https://cve.report/api/cve/CVE-2023-4623.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-4623","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-4623"},"summary":{"title":"CVE-2023-4623","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.","state":"PUBLIC","assigner":"security@google.com","published_at":"2023-09-06 14:15:00","updated_at":"2023-10-29 02:40:00"},"problem_types":["CWE-416"],"metrics":[],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html","name":"https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html","refsource":"MISC","tags":[],"title":"[SECURITY] [DLA 3623-1] linux-5.10 security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f","name":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f","refsource":"MISC","tags":[],"title":"kernel/git/torvalds/linux.git - Linux kernel source tree","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f","name":"https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f","refsource":"MISC","tags":[],"title":"","mime":"text/html","httpstatus":"404","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-4623","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4623","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"4623","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"10.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2023","cve_id":"4623","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2023","cve_id":"4623","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"2.6.12","cpe7":"rc1","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2023","cve_id":"4623","vulnerable":"1","versionEndIncluding":"2.5.75","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2023-4623","qid":"161220","title":"Oracle 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ALAS2LIVEPATCH-2023-149"},{"cve":"CVE-2023-4623","qid":"356919","title":"Amazon Linux Security Advisory for kernel-livepatch : ALAS2023LIVEPATCH-2023-026"},{"cve":"CVE-2023-4623","qid":"356923","title":"Amazon Linux Security Advisory for kernel-livepatch : ALAS2023LIVEPATCH-2023-024"},{"cve":"CVE-2023-4623","qid":"356924","title":"Amazon Linux Security Advisory for kernel-livepatch : ALAS2023LIVEPATCH-2023-025"},{"cve":"CVE-2023-4623","qid":"379043","title":"Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2023:0136)"},{"cve":"CVE-2023-4623","qid":"379435","title":"Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2024:0012)"},{"cve":"CVE-2023-4623","qid":"6000265","title":"Debian Security Update for linux-5.10 (DLA 3623-1)"},{"cve":"CVE-2023-4623","qid":"6000429","title":"Debian Security Update for linux (DLA 3710-1)"},{"cve":"CVE-2023-4623","qid":"6140413","title":"AWS Bottlerocket Security Update for kernel 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