rhsa-2020_2429
Vulnerability from csaf_redhat
Published
2020-06-09 18:46
Modified
2024-11-05 22:17
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 8.0 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):
* Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711)
* Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation (CVE-2020-11884)
* kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657)
* kernel: powerpc: incomplete Spectre-RSB mitigation leads to information exposure (CVE-2019-18660)
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: hw: provide reporting and microcode mitigation toggle for CVE-2020-0543 / Special Register Buffer Data Sampling (SRBDS) (BZ#1840684)
* missing version.h dependency for modpost may cause build to fail (BZ#1828227)
* efi: kernel panic during ltp fs test - read_all -d /sys -q -r 10 (BZ#1829525)
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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"cve": "CVE-2019-18660",
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"name": "Exposure of Sensitive Information to an Unauthorized Actor"
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"discovery_date": "2019-11-15T00:00:00+00:00",
"ids": [
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"text": "1777825"
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{
"category": "description",
"text": "A flaw was found in the way the Linux kernel implemented a software flush of the Count Cache (indirect branch cache) and Link (Return Address) Stack on the PowerPC platform. The flushing of these structures helps to prevent SpectreRSB like attacks which may leak information from one user process to another. An unprivileged user could use this flaw to cross the syscall or process boundary and read privileged memory by conducting targeted cache side-channel attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: powerpc: incomplete Spectre-RSB mitigation leads to information exposure",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue affects versions of the kernel package as shipped with Red Hat Enterprise Linux 6, 7 and 8. Future kernel updates for Red Hat Enterprise Linux 6, 7 and 8 may address this issue.\n\nThis issue does not affect the version of the kernel package as shipped with Red Hat Enterprise MRG 2.",
"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-2019-18660"
},
{
"category": "external",
"summary": "RHBZ#1777825",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1777825"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-18660",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-18660"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-18660",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18660"
}
],
"release_date": "2019-11-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-06-09T18:46:38+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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{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: powerpc: incomplete Spectre-RSB mitigation leads to information exposure"
},
{
"acknowledgments": [
{
"names": [
"Matthew Sheets"
],
"organization": "gd-ms.com"
}
],
"cve": "CVE-2020-10711",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2020-04-17T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1825116"
}
],
"notes": [
{
"category": "description",
"text": "A NULL pointer dereference flaw was found in the Linux kernel\u0027s SELinux subsystem. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol\u0027s category bitmap into the SELinux extensible bitmap via the\u0027 ebitmap_netlbl_import\u0027 routine. While processing the CIPSO restricted bitmap tag in the \u0027cipso_v4_parsetag_rbm\u0027 routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue affects the versions of the kernel packages as shipped with the Red Hat Enterprise Linux 6 starting with the Red Hat Enterprise Linux 6.7 GA version kernel-2.6.32-573 . Prior Red Hat Enterprise Linux 6 kernel versions are not affected.",
"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-2020-10711"
},
{
"category": "external",
"summary": "RHBZ#1825116",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1825116"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-10711",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-10711"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-10711",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-10711"
}
],
"release_date": "2020-05-12T12:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-06-09T18:46:38+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-2020:2429"
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/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": "Important"
}
],
"title": "Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic"
},
{
"acknowledgments": [
{
"names": [
"Christian Borntraeger"
],
"organization": "IBM"
}
],
"cve": "CVE-2020-11884",
"cwe": {
"id": "CWE-1251",
"name": "Mirrored Regions with Different Values"
},
"discovery_date": "2020-04-21T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1828149"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel on s390 architecture. The issue occurs on multiprocessing systems when one s390 CPU is in Secondary Address Mode and another CPU does a kernel page table upgrade. An inter-processor interrupt (IPI) is then sent to each active CPU to update the control registers with new page table addresses. In Secondary Address Mode the CPU\u0027s CR1 register may hold kernel space address to fetch instructions from, but after IPI processing, the same CR1 register is set to point to a user space address. An unprivileged user or process on the system may use this flaw to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect the versions of the kernel package as shipped with the Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2.\n\nThis issue affects the versions of the kernel package as shipped with the Red Hat Enterprise Linux 8. Future kernel updates for the Red Hat Enterprise Linux 8 may address this issue.",
"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-2020-11884"
},
{
"category": "external",
"summary": "RHBZ#1828149",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1828149"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-11884",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-11884"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-11884",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11884"
}
],
"release_date": "2020-04-28T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-06-09T18:46:38+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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"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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"title": "Kernel: s390: page table upgrade in secondary address mode may lead to privilege escalation"
},
{
"cve": "CVE-2020-12657",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2020-05-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1832866"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s implementation of the BFQ IO scheduler. This flaw allows a local user able to groom system memory to cause kernel memory corruption and possible privilege escalation by abusing a race condition in the IO scheduler.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body",
"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-2020-12657"
},
{
"category": "external",
"summary": "RHBZ#1832866",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1832866"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-12657",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-12657"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-12657",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12657"
}
],
"release_date": "2020-05-05T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2020-06-09T18:46:38+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-2020:2429"
},
{
"category": "workaround",
"details": "The default io scheduler for Red Hat Enterprise Linux 8 is the mq-deadline scheduler, however it can be \nconfigured to any of the available schedulers available on the system on a per-device basis.\n\nThe schedulers in use can be verified by the block devices entry in sysfs, for example for \"sda\":\n\n# cat /sys/block/sda/queue/scheduler \n[mq-deadline] kyber bfq none\n\nAll block devices in the system will need to be changed to be mitigated. If the system workload requires\nbfq, this may not be an acceptable workaround however some systems may find changing io schedulers to be an\nacceptable workaround until system updates can be applied.\n\nSee https://access.redhat.com/solutions/3756041 for how to configure the io scheduler persistently across\nsystem reboots or contact Red Hat Global Support Services.",
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"scores": [
{
"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: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body"
}
]
}
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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.