rhsa-2021_1288
Vulnerability from csaf_redhat
Published
2021-04-20 15:19
Modified
2024-11-15 11:46
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 6 Extended Lifecycle 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: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* kernel: increase slab leak leads to DoS (CVE-2021-20265)
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):
* Enable CI and changelog for GitLab workflow (BZ#1930523)
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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{
"category": "description",
"text": "A locking vulnerability was found in the tty subsystem of the Linux kernel in drivers/tty/tty_jobctrl.c. This flaw allows a local attacker to possibly corrupt memory or escalate privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free",
"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"
}
],
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29661"
}
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"category": "vendor_fix",
"date": "2021-04-20T15:19:59+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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{
"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: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free"
},
{
"acknowledgments": [
{
"names": [
"Jay Shin"
],
"organization": "Red Hat",
"summary": "This issue was discovered by Red Hat."
}
],
"cve": "CVE-2021-20265",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2020-11-27T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1908827"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the way memory resources were freed in the unix_stream_recvmsg function in the Linux kernel when a signal was pending. This flaw allows an unprivileged local user to crash the system by exhausting available memory. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: increase slab leak leads to DoS",
"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"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-20265"
},
{
"category": "external",
"summary": "RHBZ#1908827",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1908827"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-20265",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20265"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20265",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20265"
}
],
"release_date": "2016-01-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+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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"url": "https://access.redhat.com/errata/RHSA-2021:1288"
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{
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: increase slab leak leads to DoS"
},
{
"acknowledgments": [
{
"names": [
"Adam Nichols"
],
"organization": "GRIMM"
}
],
"cve": "CVE-2021-27364",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2021-02-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1930080"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. An out-of-bounds read was discovered in the libiscsi module that could lead to reading kernel memory or a crash. The highest threat from this vulnerability is to data confidentiality as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds read in libiscsi module",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available.",
"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-2021-27364"
},
{
"category": "external",
"summary": "RHBZ#1930080",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930080"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-27364",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27364"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-27364",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27364"
}
],
"release_date": "2021-03-05T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+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-2021:1288"
},
{
"category": "workaround",
"details": "The LIBISCSI 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 libiscsi /bin/true\" \u003e\u003e /etc/modprobe.d/disable-libiscsi.conf\n\nThe system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi 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 iscsi 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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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"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:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: out-of-bounds read in libiscsi module"
},
{
"acknowledgments": [
{
"names": [
"Adam Nichols"
],
"organization": "GRIMM"
}
],
"cve": "CVE-2021-27365",
"cwe": {
"id": "CWE-122",
"name": "Heap-based Buffer Overflow"
},
"discovery_date": "2021-02-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1930078"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: heap buffer overflow in the iSCSI subsystem",
"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"
}
],
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"url": "https://access.redhat.com/security/cve/CVE-2021-27365"
},
{
"category": "external",
"summary": "RHBZ#1930078",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930078"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2021-27365"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-27365",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27365"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/03/06/1",
"url": "https://www.openwall.com/lists/oss-security/2021/03/06/1"
}
],
"release_date": "2021-03-05T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2021-04-20T15:19:59+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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"url": "https://access.redhat.com/errata/RHSA-2021:1288"
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{
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"details": "The LIBISCSI 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 libiscsi /bin/true\" \u003e\u003e /etc/modprobe.d/disable-libiscsi.conf\n~~~\nThe system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi 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 iscsi 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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"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: heap buffer overflow in the iSCSI subsystem"
}
]
}
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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.