RHSA-2024:1831
Vulnerability from csaf_redhat - Published: 2024-04-16 00:28 - Updated: 2026-08-25 14:46Summary
Red Hat Security Advisory: kernel security update
Severity
Important
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: out-of-bounds write in qfq_change_class function (CVE-2023-31436)
* kernel: net/sched: sch_qfq component can be exploited if in qfq_change_agg function happens qfq_enqueue overhead (CVE-2023-3611)
* kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function (CVE-2023-3776)
* kernel: use-after-free in sch_qfq network scheduler (CVE-2023-4921)
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.
An out-of-bounds memory write flaw was found in qfq_change_agg in net/sched/sch_qfq.c in the Traffic Control (QoS) subsystem in the Linux kernel. This flaw allows a local user to crash or potentially escalate their privileges on the system.
7.8 (High)
Affected products
Fixed
56 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.53.1.el6.src | — |
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| Unresolved product id: 6Server-ELS:kernel-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-abi-whitelists-0:2.6.32-754.53.1.el6.noarch | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debug-devel-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-i686-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-devel-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:kernel-doc-0:2.6.32-754.53.1.el6.noarch | — |
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| Unresolved product id: 6Server-ELS:kernel-firmware-0:2.6.32-754.53.1.el6.noarch | — |
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fix
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| Unresolved product id: 6Server-ELS:kernel-kdump-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-kdump-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:kernel-kdump-devel-0:2.6.32-754.53.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS:perf-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:perf-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:perf-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debug-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-i686-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-s390x-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-debuginfo-common-x86_64-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:kernel-kdump-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:perf-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-0:2.6.32-754.53.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.i686 | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.s390x | — |
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| Unresolved product id: 6Server-optional-ELS:python-perf-debuginfo-0:2.6.32-754.53.1.el6.x86_64 | — |
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Threats
Impact
Important
A use-after-free vulnerability was found in fw_set_parms in net/sched/cls_fw.c in network scheduler sub-component in the Linux Kernel. This issue occurs due to a missing sanity check during cleanup at the time of failure, leading to a misleading reference. This may allow a local attacker to gain local privilege escalation.
7.0 (High)
Affected products
Fixed
56 products, the same list as for
CVE-2023-3611
Threats
Impact
Important
A use-after-free flaw was found in qfq_dequeue and agg_dequeue in net/sched/sch_qfq.c in the Traffic Control (QoS) subsystem in the Linux kernel. This issue may allow a local user to crash the system or escalate their privileges on the system.
7.8 (High)
Affected products
Fixed
56 products, the same list as for
CVE-2023-3611
Threats
Impact
Important
An out-of-bounds memory access flaw was found in the Linux kernel’s traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.
7.0 (High)
Affected products
Fixed
56 products, the same list as for
CVE-2023-3611
Threats
Impact
Important
References
27 references
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"name": "Out-of-bounds Write"
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"discovery_date": "2023-07-24T00:00:00+00:00",
"ids": [
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"text": "2225191"
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{
"category": "description",
"text": "An out-of-bounds memory write flaw was found in qfq_change_agg in net/sched/sch_qfq.c in the Traffic Control (QoS) subsystem in the Linux kernel. This flaw allows a local user to crash or potentially escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net/sched: sch_qfq component can be exploited if in qfq_change_agg function happens qfq_enqueue overhead",
"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-2023-3611"
},
{
"category": "external",
"summary": "RHBZ#2225191",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2225191"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-3611",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3611"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-3611",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3611"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64"
}
],
"release_date": "2023-07-21T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2024-04-16T00:28:30+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, 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-2024:1831"
},
{
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"details": "Mitigation for this issue is to skip loading the affected module sch_qfq onto the system until we have a fix available. This can be done by a blacklist mechanism and will ensure the driver is not loaded at the boot time.\n~~~\n How do I blacklist a kernel module to prevent it from loading automatically? \nhttps://access.redhat.com/solutions/41278 \n~~~",
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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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"details": "Important"
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"title": "kernel: net/sched: sch_qfq component can be exploited if in qfq_change_agg function happens qfq_enqueue overhead"
},
{
"cve": "CVE-2023-3776",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2023-07-24T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2225097"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in fw_set_parms in net/sched/cls_fw.c in network scheduler sub-component in the Linux Kernel. This issue occurs due to a missing sanity check during cleanup at the time of failure, leading to a misleading reference. This may allow a local attacker to gain local privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function",
"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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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-3776"
},
{
"category": "external",
"summary": "RHBZ#2225097",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2225097"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2023-3776"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-3776",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3776"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f"
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"release_date": "2023-07-06T00:00:00+00:00",
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"date": "2024-04-16T00:28:30+00:00",
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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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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function"
},
{
"cve": "CVE-2023-4921",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2023-10-22T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2245514"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in qfq_dequeue and agg_dequeue in net/sched/sch_qfq.c in the Traffic Control (QoS) subsystem in the Linux kernel. This issue may allow a local user to crash the system or escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: use-after-free in sch_qfq network scheduler",
"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-2023-4921"
},
{
"category": "external",
"summary": "RHBZ#2245514",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2245514"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-4921",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-4921"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-4921",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4921"
},
{
"category": "external",
"summary": "https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8",
"url": "https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8"
}
],
"release_date": "2023-09-05T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2024-04-16T00:28:30+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, 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": 7.8,
"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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"title": "kernel: use-after-free in sch_qfq network scheduler"
},
{
"cve": "CVE-2023-31436",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2023-05-02T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2192671"
}
],
"notes": [
{
"category": "description",
"text": "An out-of-bounds memory access flaw was found in the Linux kernel\u2019s traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds write in qfq_change_class function",
"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-2023-31436"
},
{
"category": "external",
"summary": "RHBZ#2192671",
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{
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"summary": "https://www.cve.org/CVERecord?id=CVE-2023-31436",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-31436"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-31436",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-31436"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3037933448f60f9acb705997eae62013ecb81e0d",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3037933448f60f9acb705997eae62013ecb81e0d"
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"release_date": "2023-04-13T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2024-04-16T00:28:30+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, 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-2024:1831"
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{
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"details": "To mitigate this issue, prevent the module, sch_qfq from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.",
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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: out-of-bounds write in qfq_change_class function"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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