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{"acknowledgement": "Red Hat would like to thank Dmitry Vyukov (Google) for reporting this issue.", "bugzilla": {"description": "kernel: User triggerable crash from race between key read and rey revoke", "id": "1291197", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1291197"}, "csaw": false, "cvss": {"cvss_base_score": "4.6", "cvss_scoring_vector": "AV:L/AC:L/Au:S/C:N/I:N/A:C", "status": "draft"}, "cwe": "CWE-476", "details": ["The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.", "A NULL-pointer dereference flaw was found in the kernel, which is caused by a race between revoking a user-type key and reading from it. The issue could be triggered by an unprivileged user with a local account, causing the kernel to crash (denial of service)."], "name": "CVE-2015-7550", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "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": "2015-12-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-7550\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7550"], "statement": "This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 5,6 and 7 and may be addressed in a future update.", "threat_severity": "Moderate"}