rhsa-2020_5441
Vulnerability from csaf_redhat
Published
2020-12-15 14:59
Modified
2024-11-15 08:40
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt (CVE-2020-14385)
* kernel: The flow_dissector feature allows device tracking (CVE-2019-18282)
* kernel: Buffer over-read in crypto_authenc_extractkeys() when a payload longer than 4 bytes is not aligned. (CVE-2020-10769)
* kernel: buffer uses out of index in ext3/4 filesystem (CVE-2020-14314)
* kernel: umask not applied on filesystem without ACL support (CVE-2020-24394)
* kernel: TOCTOU mismatch in the NFS client code (CVE-2020-25212)
* kernel: improper input validation in ppp_cp_parse_cr function leads to memory corruption and read overflow (CVE-2020-25643)
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.
Bug Fix(es):
* kernel-rt: update to the latest RHEL7.9.z2 source tree (BZ#1873318)
* deadlock between handle_mm_fault() and ptep_clear_flush() (BZ#1888872)
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.
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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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt (CVE-2020-14385)\n\n* kernel: The flow_dissector feature allows device tracking (CVE-2019-18282)\n\n* kernel: Buffer over-read in crypto_authenc_extractkeys() when a payload longer than 4 bytes is not aligned. (CVE-2020-10769)\n\n* kernel: buffer uses out of index in ext3/4 filesystem (CVE-2020-14314)\n\n* kernel: umask not applied on filesystem without ACL support (CVE-2020-24394)\n\n* kernel: TOCTOU mismatch in the NFS client code (CVE-2020-25212)\n\n* kernel: improper input validation in ppp_cp_parse_cr function leads to memory corruption and read overflow (CVE-2020-25643)\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.\n\nBug Fix(es):\n\n* kernel-rt: update to the latest RHEL7.9.z2 source tree (BZ#1873318)\n\n* deadlock between handle_mm_fault() and ptep_clear_flush() (BZ#1888872)", 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-2020:5441", url: "https://access.redhat.com/errata/RHSA-2020:5441", }, { category: "external", summary: "https://access.redhat.com/security/updates/classification/#important", url: "https://access.redhat.com/security/updates/classification/#important", }, { category: "external", summary: "1708775", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1708775", }, { category: "external", summary: "1796360", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1796360", }, { category: "external", summary: "1853922", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1853922", }, { category: "external", summary: "1869141", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1869141", }, { category: "external", summary: "1874800", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1874800", }, { category: "external", summary: "1877575", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1877575", }, { category: "external", summary: "1879981", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1879981", }, { category: "external", summary: "1888872", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1888872", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_5441.json", }, ], title: "Red Hat Security Advisory: kernel-rt security and bug fix update", tracking: { current_release_date: "2024-11-15T08:40:54+00:00", generator: { date: 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This flaw occurs because the auto flowlabel of the UDP IPv6 packet relies on a 32-bit hashmd value as a secret, and jhash (instead of siphash) is used. The hashmd value remains the same starting from boot time and can be inferred by an attacker.", title: "Vulnerability description", }, { category: "summary", text: "kernel: The flow_dissector feature allows device tracking", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", 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When a payload longer than 4 bytes, and is not following 4-byte alignment boundary guidelines, it causes a buffer over-read threat, leading to a system crash. This flaw allows a local attacker with user privileges to cause a denial of service.", title: "Vulnerability description", }, { category: "summary", text: "kernel: Buffer over-read in crypto_authenc_extractkeys() when a payload longer than 4 bytes is not aligned.", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", 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directory with broken indexing. This flaw allows a local user to crash the system if the directory exists. The highest threat from this vulnerability is to system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: buffer uses out of index in ext3/4 filesystem", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-debuginfo-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-devel-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", "7Server-NFV-7.9.Z:kernel-rt-debug-kvm-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", 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"1874800", }, ], notes: [ { category: "description", text: "A flaw was found in the Linux kernel. A failure of the file system metadata validator in XFS can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt. This can lead to the filesystem being shutdown, or otherwise rendered inaccessible until it is remounted, leading to a denial of service. The highest threat from this vulnerability is to system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: metadata validator in XFS may cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt", title: "Vulnerability summary", }, { category: "other", text: "Only local users, including unprivileged users in a cointainer, can trigger this flaw. 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Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.", title: "Vulnerability description", }, { category: "summary", text: "kernel: improper input validation in ppp_cp_parse_cr function leads to memory corruption and read overflow", title: "Vulnerability summary", }, { category: "other", text: "This flaw is rated as a having Moderate impact, because the bug can be triggered only if PPP protocol enabled.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.src", "7Server-NFV-7.9.Z:kernel-rt-0:3.10.0-1160.11.1.rt56.1145.el7.x86_64", 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"https://bugzilla.redhat.com/show_bug.cgi?id=1879981", }, { category: "external", summary: "https://www.cve.org/CVERecord?id=CVE-2020-25643", url: "https://www.cve.org/CVERecord?id=CVE-2020-25643", }, { category: "external", summary: "https://nvd.nist.gov/vuln/detail/CVE-2020-25643", url: "https://nvd.nist.gov/vuln/detail/CVE-2020-25643", }, { category: "external", summary: "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d42ed8b25b64eb63111a2b8582c5afc8bf1105", url: "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d42ed8b25b64eb63111a2b8582c5afc8bf1105", }, ], release_date: "2020-09-25T00:00:00+00:00", remediations: [ { category: "vendor_fix", date: "2020-12-15T14:59:20+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: [ 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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.