{"id":"CVE-2026-6862","aliases":["DEBIAN-CVE-2026-6862","EUVD-2026-24957","GHSA-364h-vxjm-52rp","OESA-2026-4450","OESA-2026-4838","OESA-2026-4839","OESA-2026-4840","RHSA-2026:69321","UBUNTU-CVE-2026-6862","openSUSE-SU-2026:12378-1"],"status":"published","title":"Efivar: efivar: denial of service due to stack overflow in device path node parsing","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00117,"percentile":0.01659,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2026-04-22T13:45:45Z","modified":"2026-11-11T12:45:11Z","fixes":[{"ecosystem":"openEuler:24.03-LTS-SP3","package":"efivar","fixed_in":["38-9.oe2403sp3"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"efivar","fixed_in":["38-9.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"efivar","fixed_in":["38-9.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP4","package":"efivar","fixed_in":["38-9.oe2403sp4"],"sources":["osv"]},{"ecosystem":"Red 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hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat hardened images"},{"vendor":"red hat","product":"red hat openshift container platform 4"},{"vendor":"ubuntu","product":"libefiboot"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69321","tags":["vendor-advisory","x_refsource_REDHAT","advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-6862","tags":["vdb-entry","x_refsource_REDHAT","Third Party Advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2459982","tags":["issue-tracking","x_refsource_REDHAT","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6862","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-364h-vxjm-52rp"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-6862","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4450","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4838","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4839","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4840","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_69321.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6862","tags":["advisory","report"]},{"url":"https://ubuntu.com/security/CVE-2026-6862","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6862","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-6862","title":"Efivar: efivar: denial of service due to stack overflow in device path node parsing","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T13:45:45.503Z","modified":"2026-11-05T22:49:06.954Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-674"],"updated_at":"2026-11-05T23:55:29.66083Z"}],"euvd":[{"id":"EUVD-2026-24957","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T13:45:45Z","modified":"2026-11-05T22:49:06Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-06T00:02:32.983223Z"}],"ghsa":[{"id":"GHSA-364h-vxjm-52rp","title":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot...","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T15:31:45Z","modified":"2026-09-21T18:31:36Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T15:12:15.376121Z"}],"nvd":[{"id":"CVE-2026-6862","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T14:17:08.06Z","modified":"2026-11-05T23:16:57.777Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-674"],"updated_at":"2026-11-06T01:57:38.479473Z"}],"osv":[{"id":"DEBIAN-CVE-2026-6862","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T14:17:08.06Z","modified":"2026-10-27T09:47:41.246375805Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:02.094661Z"},{"id":"OESA-2026-4450","title":"efivar security update","description":"Some command line interface of the UEFI variables tools are offered by .\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libefiboot, a component of the efivar project. The device path node parser in libefiboot fails to validate that each node\u0026apos;s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)","status":"published","published":"2026-10-22T14:35:16Z","modified":"2026-10-22T14:45:06.685943504Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4838","title":"efivar security update","description":"Some command line interface of the UEFI variables tools are offered by .\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node\u0026apos;s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)","status":"published","published":"2026-11-11T12:26:42Z","modified":"2026-11-11T12:45:11.761649287Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"OESA-2026-4839","title":"efivar security update","description":"Some command line interface of the UEFI variables tools are offered by .\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node\u0026apos;s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)","status":"published","published":"2026-11-11T12:26:43Z","modified":"2026-11-11T12:45:08.617327106Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"OESA-2026-4840","title":"efivar security update","description":"Some command line interface of the UEFI variables tools are offered by .\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node\u0026apos;s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)","status":"published","published":"2026-11-11T12:26:43Z","modified":"2026-11-11T12:45:09.203399445Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"RHSA-2026:69321","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-09-22T10:19:58Z","modified":"2026-09-22T10:32:10.976303761Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"UBUNTU-CVE-2026-6862","description":"A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).","status":"published","published":"2026-04-22T14:17:00Z","modified":"2026-10-17T12:59:21.200577687Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:57.159276Z"},{"id":"openSUSE-SU-2026:12378-1","title":"efivar-39-1.1 on GA media","description":"These are all security issues fixed in the efivar-39-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-01T00:00:00Z","modified":"2026-11-02T12:15:05.672900893Z","updated_at":"2026-11-02T16:58:41.463445Z"}]}}