rhsa-2021_0354
Vulnerability from csaf_redhat
Published
2021-02-02 10:15
Modified
2024-09-13 18:15
Summary
Red Hat Security Advisory: kernel-alt security update
Notes
Topic
An update for kernel-alt is now available for Red Hat Enterprise Linux 7.
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-alt packages provide the Linux kernel version 4.x.
Security Fix(es):
* kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
* kernel: some ipv6 protocols not encrypted over ipsec tunnel (CVE-2020-1749)
* kernel: use-after-free in fs/block_dev.c (CVE-2020-15436)
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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"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn\u0027t correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: some ipv6 protocols not encrypted over ipsec tunnel",
"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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"title": "kernel: some ipv6 protocols not encrypted over ipsec tunnel"
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{
"cve": "CVE-2020-15436",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2020-11-23T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1901168"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was observed in blkdev_get(), in fs/block_dev.c after a call to __blkdev_get() fails, and its refcount gets freed/released. This problem may cause a denial of service problem with a special user privilege, and may even lead to a confidentiality issue.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: use-after-free in fs/block_dev.c",
"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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"category": "external",
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-15436",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-15436"
}
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"title": "kernel: use-after-free in fs/block_dev.c"
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{
"cve": "CVE-2020-29661",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1906525"
}
],
"notes": [
{
"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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"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2020-29661"
},
{
"category": "external",
"summary": "RHBZ#1906525",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1906525"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-29661",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-29661"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-29661",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-29661"
}
],
"release_date": "2020-12-04T00:00:00+00:00",
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{
"category": "vendor_fix",
"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": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0354"
},
{
"category": "workaround",
"details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.",
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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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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free"
}
]
}
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