rhsa-2022_0529
Vulnerability from csaf_redhat
Published
2022-02-15 09:27
Modified
2024-11-06 00:28
Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)
* kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for kernel is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)\n\n* kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2022:0529", "url": "https://access.redhat.com/errata/RHSA-2022:0529" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#important", "url": "https://access.redhat.com/security/updates/classification/#important" }, { "category": "external", "summary": "1920480", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1920480" }, { "category": "external", "summary": "2034813", 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"7Server-7.3.AUS:kernel-headers-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:kernel-headers-0:3.10.0-514.97.1.el7.x86_64" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1920480" } ], "notes": [ { "category": "description", "text": "A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: use after free in eventpoll.c may lead to escalation of privilege", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", 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details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.", "product_ids": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-devel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-doc-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-tools-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-tools-debuginfo-0:3.10.0-514.97.1.el7.x86_64", 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"userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-devel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-doc-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-tools-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-tools-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-tools-libs-0:3.10.0-514.97.1.el7.x86_64", 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Buffer Size" }, "discovery_date": "2021-12-18T00:00:00+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "7Server-7.3.AUS:kernel-headers-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:kernel-headers-0:3.10.0-514.97.1.el7.x86_64" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2034813" } ], "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", 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"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79" } ], "release_date": "2022-01-10T06:36:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2022-02-15T09:27:07+00:00", "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.", "product_ids": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", 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"7Server-optional-7.3.AUS:perf-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:python-perf-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:python-perf-debuginfo-0:3.10.0-514.97.1.el7.x86_64" ], "restart_required": { "category": "machine" }, "url": "https://access.redhat.com/errata/RHSA-2022:0529" }, { "category": "workaround", "details": "This issue can be mitigated by ensuring xfs_alloc_file_space is not called with \"0\" as an argument.\n\nThis can be done with a SystemTap script (which resets \"0\" with XFS_BMAPI_PREALLOC), below are the steps:\n\n1) Save the following script in a \u0027CVE-2021-4155.stp\u0027 file\n\n--- On Red Hat Enterprise Linux 6 ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\n\tif ($alloc_type == 0)\n\t\t$alloc_type = 0x40;\t# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 6 ---\n\n--- On Red Hat Enterprise Linux 7 onwards ---\nprobe module(\"xfs\").function(\"xfs_alloc_file_space\") {\n\tif ($alloc_type == 0)\n\t\t$alloc_type = 0x8;\t# XFS_BMAPI_PREALLOC\n}\n--- On Red Hat Enterprise Linux 7 onwards ---\n\n2) Install systemtap package and its dependencies\n\n # yum install -y systemtap systemtap-runtime\n # yum install -y kernel-devel kernel-debuginfo\n\n3) Build the mitigation kernel module as root.\n\n # stap -r `uname -r` -m cve_2021_4155.ko -g CVE-2021-4155.stp -p4\n\n4) Load the mitigation module as root\n\n # staprun -L cve_2021_4155.ko\n\n\n\nWhat is SystemTap and how to use it?\nhttps://access.redhat.com/solutions/5441", "product_ids": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debuginfo-0:3.10.0-514.97.1.el7.x86_64", 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"7Server-optional-7.3.AUS:perf-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:python-perf-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:python-perf-debuginfo-0:3.10.0-514.97.1.el7.x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "products": [ "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.src", "7Server-7.3.AUS:kernel-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-abi-whitelists-0:3.10.0-514.97.1.el7.noarch", "7Server-7.3.AUS:kernel-debug-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-debuginfo-0:3.10.0-514.97.1.el7.x86_64", "7Server-7.3.AUS:kernel-debug-devel-0:3.10.0-514.97.1.el7.x86_64", 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"7Server-optional-7.3.AUS:python-perf-0:3.10.0-514.97.1.el7.x86_64", "7Server-optional-7.3.AUS:python-perf-debuginfo-0:3.10.0-514.97.1.el7.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ], "title": "kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL" } ] }
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.