CVE-2026-23268

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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": 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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\napparmor: correcci\u00f3n de que un usuario local sin privilegios puede realizar gesti\u00f3n de pol\u00edticas privilegiada\n\nUn usuario local sin privilegios puede cargar, reemplazar y eliminar perfiles abriendo las interfaces de apparmorfs, a trav\u00e9s de un ataque de adjunto confundido, pasando el descriptor de archivo (fd) abierto a un proceso privilegiado y haciendo que el proceso privilegiado escriba en la interfaz.\n\nEsto requiere un objetivo privilegiado que pueda ser manipulado para realizar la escritura en nombre del proceso sin privilegios, pero una vez que se logra dicho acceso, es posible una gesti\u00f3n completa de pol\u00edticas y todas las posibles implicaciones que esto conlleva: eliminaci\u00f3n del confinamiento, DoS del sistema o de las aplicaciones objetivo denegando toda ejecuci\u00f3n, eludiendo la restricci\u00f3n del espacio de nombres de usuario sin privilegios, hasta la explotaci\u00f3n de errores del kernel para una escalada de privilegios local.\n\nLa interfaz de gesti\u00f3n de pol\u00edticas no puede tener sus permisos simplemente cambiados de 0666 a 0600 porque los procesos que no son root necesitan poder cargar pol\u00edticas en diferentes espacios de nombres de pol\u00edticas.\n\nEn su lugar, aseg\u00farese de que la tarea que escribe en la interfaz tenga privilegios que sean un subconjunto de la tarea que abri\u00f3 la interfaz. Esto ya se hace a trav\u00e9s de pol\u00edticas para procesos confinados, pero los no confinados pueden delegar acceso al descriptor de archivo (fd) abierto, eludiendo la verificaci\u00f3n de pol\u00edtica habitual."}], "id": "CVE-2026-23268", "lastModified": "2026-06-17T10:21:13.277", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-03-18T18:16:25.753", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0fc63dd9170643d15c25681fca792539e23f4640"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17debf5586020790b5717f96e5e6a3ca5bb961ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33ee909702e047c94aaf41d4eea35626d509802c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cafce4d6d0a66ec27e3af5637c11901d60189fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6601e13e82841879406bf9f369032656f441a425"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a407a078cd41b5261b99d822af784bd9f136eb4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b6a94eeca9c6c8f7c55ad44c62c98324f51ec596"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Third Party Advisory"], "url": "https://www.qualys.com/2026/03/10/crack-armor.txt"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: apparmor: fix unprivileged local user can do privileged policy management", "id": "2448752", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448752"}, "csaw": false, "details": ["No description is available for this CVE."], "name": "CVE-2026-23268", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23268\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23268\nhttps://lore.kernel.org/linux-cve-announce/2026031846-CVE-2026-23268-6be3@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b7fd2c0340eacbee892425e9007647568b7f2a3c,0fc63dd9170643d15c25681fca792539e23f4640)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b7fd2c0340eacbee892425e9007647568b7f2a3c,b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b7fd2c0340eacbee892425e9007647568b7f2a3c,b6a94eeca9c6c8f7c55ad44c62c98324f51ec596)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b7fd2c0340eacbee892425e9007647568b7f2a3c,6601e13e82841879406bf9f369032656f441a425)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.77,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.18,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.8,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc4,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-03-19T08:55:50.404426+00:00", "updated": "2026-05-29T21:30:06.282824+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}