rhsa-2020_2285
Vulnerability from csaf_redhat
Published
2020-05-26 20:21
Modified
2024-11-05 22:16
Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced 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
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: double free may be caused by the function allocate_trace_buffer in the file kernel/trace/trace.c (CVE-2017-18595)
* kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c (CVE-2019-19768)
* Kernel: NetLabel: null pointer dereference while receiving CIPSO packet with null category may cause kernel panic (CVE-2020-10711)
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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"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.",
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"title": "kernel: double free may be caused by the function allocate_trace_buffer in the file kernel/trace/trace.c"
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{
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"text": "A use-after-free vulnerability was found in the Linux kernel\u2019s implementation of blktrace in the __blk_add_trace function. A local attacker with permissions to run block trace instructions against a device can create a situation where the core block_trace object is used after it is freed. The attacker can pre-groom memory to race this use-after-free to create a condition where the memory is corrupted and cause privilege escalation.\r\n\r\nThe ability to create this condition requires elevated privileges, and it has been decided that this change in Red Hat Enterprise Linux 5 and 6 would risk introducing possible regressions and will not be backported.",
"title": "Vulnerability description"
},
{
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"text": "kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c",
"title": "Vulnerability summary"
},
{
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"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.",
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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: use-after-free in __blk_add_trace in kernel/trace/blktrace.c"
},
{
"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"
}
],
"product_status": {
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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": "2020-05-26T20:21:25+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": "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"
}
]
}
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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.