rhsa-2019_1485
Vulnerability from csaf_redhat
Published
2019-06-17 19:35
Modified
2024-11-05 21:09
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.
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):
* An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
* Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
* Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)
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):
* THP: Race between MADV_DONTNEED and NUMA hinting node migration code (BZ#1698103)
* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712989)
* [RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712994)
* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713000)
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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"acknowledgments": [
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"names": [
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"organization": "Netflix Information Security"
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"cve": "CVE-2019-11477",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
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"discovery_date": "2019-06-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1719123"
}
],
"notes": [
{
"category": "description",
"text": "An integer overflow flaw was found in the way the Linux kernel\u0027s networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel\u0027s socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack",
"title": "Statement"
},
{
"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"
}
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-11477"
},
{
"category": "external",
"summary": "RHBZ#1719123",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719123"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-11477",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-11477"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-11477",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11477"
},
{
"category": "external",
"summary": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310",
"url": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2019/06/17/5",
"url": "https://www.openwall.com/lists/oss-security/2019/06/17/5"
}
],
"release_date": "2019-06-17T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2019-06-17T19:35:59+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.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2019:1485"
},
{
"category": "workaround",
"details": "For mitigation, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service"
},
{
"acknowledgments": [
{
"names": [
"Jonathan Looney"
],
"organization": "Netflix Information Security"
}
],
"cve": "CVE-2019-11478",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2019-06-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1719128"
}
],
"notes": [
{
"category": "description",
"text": "An excessive resource consumption flaw was found in the way the Linux kernel\u0027s networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel\u0027s socket buffer (SKB) data structure becomes fragmented, which leads to increased resource utilization to traverse and process these fragments as further SACK segments are received on the same TCP connection. A remote attacker could use this flaw to cause a denial of service (DoS) by sending a crafted sequence of SACK segments on a TCP connection.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack\n\nRed Hat Enterprise Linux 5 is now in Maintenance Support 2 Phase of maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
"title": "Statement"
},
{
"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": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-11478"
},
{
"category": "external",
"summary": "RHBZ#1719128",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719128"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-11478",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-11478"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-11478",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11478"
},
{
"category": "external",
"summary": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310",
"url": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2019/06/17/5",
"url": "https://www.openwall.com/lists/oss-security/2019/06/17/5"
}
],
"release_date": "2019-06-17T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2019-06-17T19:35:59+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.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2019:1485"
},
{
"category": "workaround",
"details": "For mitigation, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service"
},
{
"acknowledgments": [
{
"names": [
"Jonathan Looney"
],
"organization": "Netflix Information Security"
}
],
"cve": "CVE-2019-11479",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2019-06-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1719129"
}
],
"notes": [
{
"category": "description",
"text": "An excessive resource consumption flaw was found in the way the Linux kernel\u0027s networking subsystem processed TCP segments. If the Maximum Segment Size (MSS) of a TCP connection was set to low values, such as 48 bytes, it can leave as little as 8 bytes for the user data, which significantly increases the Linux kernel\u0027s resource (CPU, Memory, and Bandwidth) utilization. A remote attacker could use this flaw to cause a denial of service (DoS) by repeatedly sending network traffic on a TCP connection with low TCP MSS.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack\n\nRed Hat Enterprise Linux 5 is now in the Extended Life Phase of maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
"title": "Statement"
},
{
"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": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-11479"
},
{
"category": "external",
"summary": "RHBZ#1719129",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719129"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-11479",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-11479"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-11479",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-11479"
},
{
"category": "external",
"summary": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310",
"url": "https://patchwork.ozlabs.org/project/netdev/list/?series=114310"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2019/06/17/5",
"url": "https://www.openwall.com/lists/oss-security/2019/06/17/5"
}
],
"release_date": "2019-06-17T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2019-06-17T19:35:59+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.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2019:1485"
},
{
"category": "workaround",
"details": "For mitigation, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service"
}
]
}
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