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{"acknowledgement": "This issue was discovered by Jay Shin (Red Hat).", "affected_release": [{"advisory": "RHSA-2021:4646", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-348.2.1.rt7.132.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-15T00:00:00Z"}, {"advisory": "RHSA-2021:4647", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-348.2.1.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-15T00:00:00Z"}, {"advisory": "RHSA-2021:4875", "cpe": "cpe:/a:redhat:rhel_eus:8.2::nfv", "package": "kernel-rt-0:4.18.0-193.70.1.rt13.120.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-11-30T00:00:00Z"}, {"advisory": "RHSA-2021:4871", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.70.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-11-30T00:00:00Z"}, {"advisory": "RHSA-2021:4648", "cpe": "cpe:/a:redhat:rhel_eus:8.4::nfv", "package": "kernel-rt-0:4.18.0-305.28.1.rt7.100.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2021-11-15T00:00:00Z"}, {"advisory": "RHSA-2021:4650", "cpe": "cpe:/o:redhat:rhel_eus:8.4", "package": "kernel-0:4.18.0-305.28.1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2021-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: timer tree corruption leads to missing wakeup and system freeze", "id": "2005258", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2005258"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-665", "details": ["A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.", "A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP. The highest threat from this vulnerability is system availability."], "mitigation": {"lang": "en:us", "value": "In order to mitigate this issue, it is possible to prevent the affected code by loading the kvm module with \"pi_inject_timer=0\" parameter.\n~~~\nrmmod kvm_intel kvm\nmodprobe kvm pi_inject_timer=0 \nmodprobe kvm_intel\n~~~"}, "name": "CVE-2021-20317", "package_state": [{"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:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-09-23T16:20:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-20317\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-20317\nhttps://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d7061eda3eb1faf3f57dcc936ff75863f1"], "threat_severity": "Moderate", "upstream_fix": "Linux Kernel 5.4-rc1"}