rhsa-2023_4888
Vulnerability from csaf_redhat
Published
2023-08-30 22:06
Modified
2024-09-13 21:14
Summary
Red Hat Security Advisory: kpatch-patch security update
Notes
Topic
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8.6 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: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c (CVE-2022-42896)
* kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter (CVE-2023-1829)
* kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests (CVE-2023-3390)
* kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt() (CVE-2023-35788)
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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"url": "https://access.redhat.com/errata/RHSA-2023:4888"
},
{
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"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c"
},
{
"cve": "CVE-2023-1829",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
},
"discovery_date": "2023-04-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2188470"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in the traffic control index filter (tcindex) in the Linux kernel. The tcindex_delete does not properly deactivate filters, which can later lead to double freeing the structure. This flaw allows a local attacker to cause a use-after-free problem, leading to privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "For Red Hat Enterprise Linux 7, please use the mitigation to disable module cls_tcindex, because similar use-after-free issues also exists in the Linux Kernel\u0027s traffic control index filter and will not be fixed before Red Hat Enterprise Linux 8.",
"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-2023-1829"
},
{
"category": "external",
"summary": "RHBZ#2188470",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2188470"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-1829",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-1829"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-1829",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1829"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c710f75256bb3cf05ac7b1672c82b92c43f3d28",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c710f75256bb3cf05ac7b1672c82b92c43f3d28"
}
],
"release_date": "2023-04-20T00:00:00+00:00",
"remediations": [
{
"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",
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},
"url": "https://access.redhat.com/errata/RHSA-2023:4888"
},
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"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/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 vulnerability in the Linux Kernel traffic control index filter"
},
{
"acknowledgments": [
{
"names": [
"Alagu M"
],
"organization": "Salesforce Offensive Security team"
}
],
"cve": "CVE-2023-3390",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2023-06-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2213260"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in the Netfilter subsystem of the Linux kernel when processing named and anonymous sets in batch requests, which can lead to performing arbitrary reads and writes in kernel memory. This flaw allows a local user with CAP_NET_ADMIN capability to crash or potentially escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Only local users with `CAP_NET_ADMIN` capability or root can trigger this issue. \nOn Red Hat Enterprise Linux, local unprivileged users can exploit unprivileged user namespaces (CONFIG_USER_NS) to grant themselves this capability.\n\nThe OpenShift Container Platform (OCP) control planes or master machines are based on Red Hat Enterprise Linux CoreOS (RHCOS) that consists primarily of RHEL components, therefore, it is also affected by this kernel vulnerability. A successful exploit needs necessary privileges (CAP_NET_ADMIN) and direct, local access. A local user in RHCOS is already a root with full permissions, hence existence of this vulnerability does not bring any value from the potential attacker perspective. From the OpenShift containers perspective, this vulnerability cannot be exploited as in OpenShift the cluster processes on the node are namespaced, which means that switching the namespace in the running OpenShift container will not bring necessary capabilities.\nThis means that for OpenShift, the impact of this vulnerability is Low.\n\nSimilar to the CVE-2023-32233 vulnerability, this has been explained in the following blog post as an example of a \"Container escape vulnerability\":\nhttps://www.redhat.com/en/blog/containers-vulnerability-risk-assessment",
"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-2023-3390"
},
{
"category": "external",
"summary": "RHBZ#2213260",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2213260"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-3390",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3390"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-3390",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3390"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1240eb93f0616b21c675416516ff3d74798fdc97",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1240eb93f0616b21c675416516ff3d74798fdc97"
}
],
"release_date": "2023-06-08T00:00:00+00:00",
"remediations": [
{
"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",
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{
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"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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{
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"details": "Important"
}
],
"title": "kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests"
},
{
"cve": "CVE-2023-35788",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2023-06-17T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2215768"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the TC flower classifier (cls_flower) in the Networking subsystem of the Linux kernel. This issue occurs when sending two TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets with a total size of 252 bytes, which results in an out-of-bounds write when the third packet enters fl_set_geneve_opt, potentially leading to a denial of service or privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Enterprise Linux 6 is not affected by this flaw as it did not include support for the TC flower classifier.",
"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-2023-35788"
},
{
"category": "external",
"summary": "RHBZ#2215768",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2215768"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-35788",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-35788"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-35788",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-35788"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2023/06/07/1",
"url": "https://www.openwall.com/lists/oss-security/2023/06/07/1"
}
],
"release_date": "2023-05-29T00:00:00+00:00",
"remediations": [
{
"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",
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},
"url": "https://access.redhat.com/errata/RHSA-2023:4888"
},
{
"category": "workaround",
"details": "This flaw can be mitigated by preventing the affected `cls_flower` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.",
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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: cls_flower: out-of-bounds write in fl_set_geneve_opt()"
}
]
}
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