{"id":"CVE-2026-80929","title":"sysctl: move the \"cad_pid\" entry from pid_table[] to kern_reboot_table[]","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsysctl: move the \"cad_pid\" entry from pid_table[] to kern_reboot_table[]\n\ncad_pid is global, and kill_cad_pid() is only used in the root namespace.\n\nHowever, due to pid…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-279"],"vendor":"Linux","product":"Linux","affected":["Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < e8527de7fea191fda704792a56081f9009aeec37","Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd","Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < 7170ca01623b399c97f2ae9d3e228badc1f25ea3","Linux 6.17"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:45:13.127Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80929","references":[{"url":"https://git.kernel.org/stable/c/e8527de7fea191fda704792a56081f9009aeec37"},{"url":"https://git.kernel.org/stable/c/a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd"},{"url":"https://git.kernel.org/stable/c/7170ca01623b399c97f2ae9d3e228badc1f25ea3"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80929.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80929"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532283"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80929"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80929"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80929.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00162,"epssPercentile":0.05295,"scores":{"cna":7.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80929","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsysctl: move the \"cad_pid\" entry from pid_table[] to kern_reboot_table[]\n\ncad_pid is global, and kill_cad_pid() is only used in the root namespace.\n\nHowever, due to pid_table_root_permissions(), a non-root user can unshare\npid/user namespaces and modify it from the child namespace. This makes no\nsense and is simply wrong.\n\nMove it to kern_reboot_table[] where it logically belongs; this ensures\nthat only GLOBAL_ROOT_UID can read/modify this sysctl.\n\nNote that this patch doesn't preserve \"#ifdef CONFIG_PROC_SYSCTL\" around\nthe \"cad_pid\"; CONFIG_PROC_SYSCTL selects CONFIG_SYSCTL, so it is always\nset when kern_reboot_table[] is compiled.\n\n## Affected\n\n- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < e8527de7fea191fda704792a56081f9009aeec37`\n- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < a09bc4eaa67e1a72df3b6d0beb3afeef1e1fdfcd`\n- `Linux >= e054bcbe7e7af2baad3752f1a4916a7fffc0457e < 7170ca01623b399c97f2ae9d3e228badc1f25ea3`\n- `Linux 6.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80929.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224827,"id":"CVE-2026-80929","ts":1792401566754,"field":"cvss","old":"7","new":"7.8"},{"seq":202777,"id":"CVE-2026-80929","ts":1789403715866,"field":"cvss","old":"7.8","new":"7"},{"seq":183823,"id":"CVE-2026-80929","ts":1789356677558,"field":"cvss","old":"7.8","new":"7"},{"seq":153110,"id":"CVE-2026-80929","ts":1789285349047,"field":"cvss","old":null,"new":"7.8"},{"seq":153109,"id":"CVE-2026-80929","ts":1789285349047,"field":"severity","old":"none","new":"high"},{"seq":147468,"id":"CVE-2026-80929","ts":1789270211027,"field":"cvss","old":null,"new":"7"},{"seq":147467,"id":"CVE-2026-80929","ts":1789270211027,"field":"severity","old":"none","new":"high"},{"seq":109222,"id":"CVE-2026-80929","ts":1789183730787,"field":"cvss","old":null,"new":"7"},{"seq":109221,"id":"CVE-2026-80929","ts":1789183730787,"field":"severity","old":"none","new":"high"}]}