{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23268", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.991Z", "datePublished": "2026-03-18T17:54:41.974Z", "dateUpdated": "2026-08-05T12:20:58.461Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:58.461Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix unprivileged local user can do privileged policy management\n\nAn unprivileged local user can load, replace, and remove profiles by\nopening the apparmorfs interfaces, via a confused deputy attack, by\npassing the opened fd to a privileged process, and getting the\nprivileged process to write to the interface.\n\nThis does require a privileged target that can be manipulated to do\nthe write for the unprivileged process, but once such access is\nachieved full policy management is possible and all the possible\nimplications that implies: removing confinement, DoS of system or\ntarget applications by denying all execution, by-passing the\nunprivileged user namespace restriction, to exploiting kernel bugs for\na local privilege escalation.\n\nThe policy management interface can not have its permissions simply\nchanged from 0666 to 0600 because non-root processes need to be able\nto load policy to different policy namespaces.\n\nInstead ensure the task writing the interface has privileges that\nare a subset of the task that opened the interface. This is already\ndone via policy for confined processes, but unconfined can delegate\naccess to the opened fd, by-passing the usual policy check." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attacker must be a local user to open the apparmorfs interface files and pass the file descriptor to a privileged process via local IPC mechanisms.\nAC:L - On typical Linux systems (desktop, server, Android), privileged daemons that accept and act on fds from unprivileged users are common (D-Bus services, systemd units). The attacker can reliably identify and leverage such confused deputies.\nPR:L - Requires a basic unprivileged local user account. The apparmorfs interface files are created with 0666 permissions, so any local user can open them.\nUI:N - No user interaction is needed. The confused deputy is a system service/daemon that can be programmatically triggered, not a human user who must take action.\nS:U - The vulnerability and its impact remain within the kernel security authority. While AppArmor policy manipulation is severe, it is standard kernel privilege escalation within the same security domain.\nC:H - By removing AppArmor confinement profiles, the attacker can access information previously protected by mandatory access control policies, enabling arbitrary information disclosure.\nI:H - The attacker gains full policy management capabilities: loading arbitrary policies, replacing existing ones, and removing confinement. This allows arbitrary modification of the system's mandatory access control, fundamentally compromising integrity.\nA:H - As stated in the commit, the attacker can cause DoS of the system or target applications by loading policies that deny all execution, effectively making the system non-functional." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/apparmor/apparmorfs.c", "security/apparmor/include/policy.h", "security/apparmor/policy.c" ], "versions": [ { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "a407a078cd41b5261b99d822af784bd9f136eb4d", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "4cafce4d6d0a66ec27e3af5637c11901d60189fa", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "33ee909702e047c94aaf41d4eea35626d509802c", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "17debf5586020790b5717f96e5e6a3ca5bb961ab", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "0fc63dd9170643d15c25681fca792539e23f4640", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "b6a94eeca9c6c8f7c55ad44c62c98324f51ec596", "status": "affected", "versionType": "git" }, { "version": "b7fd2c0340eacbee892425e9007647568b7f2a3c", "lessThan": "6601e13e82841879406bf9f369032656f441a425", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "security/apparmor/apparmorfs.c", "security/apparmor/include/policy.h", "security/apparmor/policy.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.169", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.77", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.18", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.8", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.169" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.77" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.19.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a407a078cd41b5261b99d822af784bd9f136eb4d" }, { "url": "https://git.kernel.org/stable/c/4cafce4d6d0a66ec27e3af5637c11901d60189fa" }, { "url": "https://git.kernel.org/stable/c/33ee909702e047c94aaf41d4eea35626d509802c" }, { "url": "https://git.kernel.org/stable/c/17debf5586020790b5717f96e5e6a3ca5bb961ab" }, { "url": "https://git.kernel.org/stable/c/0fc63dd9170643d15c25681fca792539e23f4640" }, { "url": "https://git.kernel.org/stable/c/b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6" }, { "url": "https://git.kernel.org/stable/c/b6a94eeca9c6c8f7c55ad44c62c98324f51ec596" }, { "url": "https://git.kernel.org/stable/c/6601e13e82841879406bf9f369032656f441a425" }, { "url": "https://www.qualys.com/2026/03/10/crack-armor.txt" } ], "title": "apparmor: fix unprivileged local user can do privileged policy management", "x_generator": { "engine": "bippy-1.2.0" } } } }