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{"bugzilla": {"description": "kernel: Race conditions in collect_mounts", "id": "1248486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1248486"}, "csaw": false, "cvss": {"cvss_base_score": "4.9", "cvss_scoring_vector": "AV:L/AC:L/Au:N/C:C/I:N/A:N", "status": "draft"}, "cwe": "CWE-476", "details": ["The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call.", "A flaw was discovered in the kernel's collect_mounts function. If the kernel's audit subsystem called collect_mounts to audit an unmounted path, it could panic the system. With this flaw, an unprivileged user could call umount(MNT_DETACH) to launch a denial-of-service attack."], "name": "CVE-2015-4177", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:4", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 4"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Will not fix", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2015-07-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-4177\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-4177"], "statement": "This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5, 6, MRG-2, realtime and arm-kernels.\nThe issue is not currently planned to be addressed in Red Hat Enterprise Linux 7.", "threat_severity": "Moderate"}