271 lines
15 KiB
JSON
271 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-23268",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-01-13T15:37:45.991Z",
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"datePublished": "2026-03-18T17:54:41.974Z",
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"dateUpdated": "2026-08-05T12:20:58.461Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:20:58.461Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/apparmor/apparmorfs.c",
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"security/apparmor/include/policy.h",
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"security/apparmor/policy.c"
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],
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"versions": [
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{
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"version": "b7fd2c0340eacbee892425e9007647568b7f2a3c",
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"lessThan": "a407a078cd41b5261b99d822af784bd9f136eb4d",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "4cafce4d6d0a66ec27e3af5637c11901d60189fa",
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"status": "affected",
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},
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{
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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},
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"lessThan": "6601e13e82841879406bf9f369032656f441a425",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/apparmor/apparmorfs.c",
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"security/apparmor/include/policy.h",
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"security/apparmor/policy.c"
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],
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"versions": [
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{
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"version": "4.11",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.11",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.253",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.203",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.169",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.130",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.77",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.18",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.8",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"url": "https://git.kernel.org/stable/c/33ee909702e047c94aaf41d4eea35626d509802c"
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},
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"url": "https://git.kernel.org/stable/c/17debf5586020790b5717f96e5e6a3ca5bb961ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/0fc63dd9170643d15c25681fca792539e23f4640"
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},
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{
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"url": "https://git.kernel.org/stable/c/b60b3f7a35c46b2e0ca934f9c988b8fca06d76c6"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6a94eeca9c6c8f7c55ad44c62c98324f51ec596"
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},
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{
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"url": "https://git.kernel.org/stable/c/6601e13e82841879406bf9f369032656f441a425"
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},
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{
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"url": "https://www.qualys.com/2026/03/10/crack-armor.txt"
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}
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],
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"title": "apparmor: fix unprivileged local user can do privileged policy management",
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