Show plain JSON{"acknowledgement": "Red Hat would like to thank Kirill Tkhai (Virtuozzo Kernel team) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2022:1417", "cpe": "cpe:/o:redhat:rhel_els:6", "package": "kernel-0:2.6.32-754.47.1.el6", "product_name": "Red Hat Enterprise Linux 6 Extended Lifecycle Support", "release_date": "2022-04-19T00:00:00Z"}, {"advisory": "RHSA-2022:0622", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-1160.59.1.rt56.1200.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0592", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0620", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-1160.59.1.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0529", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "kernel-0:3.10.0-514.97.1.el7", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0530", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "kernel-0:3.10.0-693.96.1.el7", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0531", "cpe": "cpe:/o:redhat:rhel_aus:7.6", "package": "kernel-0:3.10.0-957.88.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0531", "cpe": "cpe:/o:redhat:rhel_tus:7.6", "package": "kernel-0:3.10.0-957.88.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Telco Extended Update Support", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0531", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "kernel-0:3.10.0-957.88.1.el7", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0533", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2022-02-15T00:00:00Z"}, {"advisory": "RHSA-2022:0712", "cpe": "cpe:/o:redhat:rhel_aus:7.7", "package": "kernel-0:3.10.0-1062.63.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Advanced Update Support", "release_date": "2022-03-01T00:00:00Z"}, {"advisory": "RHSA-2022:0712", "cpe": "cpe:/o:redhat:rhel_tus:7.7", "package": "kernel-0:3.10.0-1062.63.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Telco Extended Update Support", "release_date": "2022-03-01T00:00:00Z"}, {"advisory": "RHSA-2022:0712", "cpe": "cpe:/o:redhat:rhel_e4s:7.7", "package": "kernel-0:3.10.0-1062.63.1.el7", "product_name": "Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions", "release_date": "2022-03-01T00:00:00Z"}, {"advisory": "RHSA-2022:0718", "cpe": "cpe:/o:redhat:rhel_e4s:7.7", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions", "release_date": "2022-03-01T00:00:00Z"}, {"advisory": "RHSA-2022:0176", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-348.12.2.rt7.143.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-01-19T00:00:00Z"}, {"advisory": "RHSA-2022:0188", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-348.12.2.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-01-19T00:00:00Z"}, {"advisory": "RHSA-2022:0232", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-01-24T00:00:00Z"}, {"advisory": "RHSA-2022:0335", "cpe": "cpe:/o:redhat:rhel_e4s:8.1", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-02-01T00:00:00Z"}, {"advisory": "RHSA-2022:0344", "cpe": "cpe:/o:redhat:rhel_e4s:8.1", "package": "kernel-0:4.18.0-147.59.1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-02-01T00:00:00Z"}, {"advisory": "RHSA-2022:0958", "cpe": "cpe:/o:redhat:rhel_e4s:8.1", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-03-17T00:00:00Z"}, {"advisory": "RHSA-2022:0629", "cpe": "cpe:/a:redhat:rhel_eus:8.2::nfv", "package": "kernel-rt-0:4.18.0-193.75.1.rt13.125.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0590", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0636", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.75.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-02-22T00:00:00Z"}, {"advisory": "RHSA-2022:0187", "cpe": "cpe:/a:redhat:rhel_eus:8.4::nfv", "package": "kernel-rt-0:4.18.0-305.34.2.rt7.107.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-01-19T00:00:00Z"}, {"advisory": "RHSA-2022:0186", "cpe": "cpe:/o:redhat:rhel_eus:8.4", "package": "kernel-0:4.18.0-305.34.2.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-01-19T00:00:00Z"}, {"advisory": "RHSA-2022:0231", "cpe": "cpe:/o:redhat:rhel_eus:8.4", "package": "kpatch-patch", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-01-24T00:00:00Z"}, {"advisory": "RHSA-2022:1263", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.22-20220330.1.el7_9", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2022-04-07T00:00:00Z"}, {"advisory": "RHSA-2022:0540", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "redhat-virtualization-host-0:4.4.10-202202081536_8.5", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2022-02-15T00:00:00Z"}], "bugzilla": {"description": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL", "id": "2034813", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2034813"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-131", "details": ["A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.", "A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them."], "mitigation": {"lang": "en:us", "value": "This issue can be mitigated by ensuring xfs_alloc_file_space is not called with \"0\" as an argument.\nThis can be done with a SystemTap script (which resets \"0\" with XFS_BMAPI_PREALLOC), below are the steps:\n1) Save the following script in a 'CVE-2021-4155.stp' file\n--- On Red Hat Enterprise Linux 6 ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\nif ($alloc_type == 0)\n$alloc_type = 0x40;# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 6 ---\n--- On Red Hat Enterprise Linux 7 onwards ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\nif ($alloc_type == 0)\n$alloc_type = 0x8;# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 7 onwards ---\n2) Install systemtap package and its dependencies\n# yum install -y systemtap systemtap-runtime\n# yum install -y kernel-devel kernel-debuginfo\n3) Build the mitigation kernel module as root.\n# stap -r `uname -r` -m cve_2021_4155.ko -g CVE-2021-4155.stp -p4\n4) Load the mitigation module as root\n# staprun -L cve_2021_4155.ko\nWhat is SystemTap and how to use it?\nhttps://access.redhat.com/solutions/5441"}, "name": "CVE-2021-4155", "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:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2022-01-10T06:36:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-4155\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-4155\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79"], "threat_severity": "Important"} 
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