rhsa-2021_3442
Vulnerability from csaf_redhat
Published
2021-09-07 15:01
Modified
2024-11-15 10:37
Summary
Red Hat Security Advisory: kpatch-patch security update
Notes
Topic
An update is now available for Red Hat Enterprise Linux 8.1 Extended 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
This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
* kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)
* kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
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.
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"ids": [
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"text": "1971651"
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"category": "description",
"text": "A flaw was found in the CAN BCM networking protocol in the Linux kernel, where a local attacker can abuse a flaw in the CAN subsystem to corrupt memory, crash the system or escalate privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: race condition in net/can/bcm.c leads to local privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.\n\nFor Red Hat Virtualization, this flaw is rated Moderate as CAN is not used on host nodes.",
"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-2021-3609"
},
{
"category": "external",
"summary": "RHBZ#1971651",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1971651"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3609",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3609"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3609",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3609"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/06/19/1",
"url": "https://www.openwall.com/lists/oss-security/2021/06/19/1"
}
],
"release_date": "2021-06-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-09-07T15:01:52+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",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:3442"
},
{
"category": "workaround",
"details": "As the CAN module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:\n\n# echo \"install can-bcm /bin/true\" \u003e\u003e /etc/modprobe.d/disable-can-bcm.conf\n\nThe system will need to be restarted if the CAN modules are loaded. In most circumstances, the CAN kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.\n\nIf the system requires this module to work correctly, this mitigation may not be suitable.\n\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: race condition in net/can/bcm.c leads to local privilege escalation"
},
{
"acknowledgments": [
{
"names": [
"Zhenpeng Lin"
]
}
],
"cve": "CVE-2021-3715",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2021-08-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1993988"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the \"Routing decision\" classifier in the Linux kernel\u0027s Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. 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 route4_change() in net/sched/cls_route.c",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw is rated as having Moderate impact (Red Hat Enterprise Linux 7 and lower) because of the need to have CAP_NET_ADMIN privileges and that Red Hat Enterprise Linux 7 disabled unprivileged user/network namespaces by default.\n\nThis flaw is rated as having Important impact (Red Hat Enterprise Linux 8) because Red Hat Enterprise Linux 8 enabled unprivileged user/network namespaces by default which can be used to gain CAP_NET_ADMIN privileges in corresponding user namespace even for otherwise unprivileged local user and thus exercise this vulnerability.",
"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-2021-3715"
},
{
"category": "external",
"summary": "RHBZ#1993988",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1993988"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3715",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3715"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3715",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3715"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359"
}
],
"release_date": "2021-09-07T08:25:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-09-07T15:01:52+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",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:3442"
},
{
"category": "workaround",
"details": "In order to mitigate this issue, it is possible to prevent the affected code from being loaded by blacklisting the kernel module cls_route.ko. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278.\n\nAlternatively, if cls_route is being used, on Red Hat Enterprise Linux 8, you can disable unprivileged user namespaces by setting user.max_user_namespaces to 0:\n\n# echo \"user.max_user_namespaces=0\" \u003e /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"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"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: use-after-free in route4_change() in net/sched/cls_route.c"
},
{
"cve": "CVE-2021-37576",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
},
"discovery_date": "2021-06-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1986506"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found on the Linux kernel. On the PowerPC platform, the KVM guest allows the OS users to cause host OS memory corruption via rtas_args.nargs. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: powerpc: KVM guest OS users can cause host OS memory corruption",
"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": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-37576"
},
{
"category": "external",
"summary": "RHBZ#1986506",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1986506"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-37576",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-37576"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-37576",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-37576"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/07/26/1",
"url": "https://www.openwall.com/lists/oss-security/2021/07/26/1"
}
],
"release_date": "2021-07-23T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-09-07T15:01:52+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",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"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"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: powerpc: KVM guest OS users can cause host OS memory corruption"
}
]
}
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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.