RHSA-2024:0262

Vulnerability from csaf_redhat - Published: 2024-01-16 15:57 - Updated: 2026-11-06 20:30
Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 7.7 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: 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: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (CVE-2023-4128, CVE-2023-4206, CVE-2023-4207, CVE-2023-4208) 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.
CVE-2023-3611

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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: 7Server-7.7.AUS:bpftool-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:bpftool-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-0:3.10.0-1062.82.1.el7.src —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-abi-whitelists-0:3.10.0-1062.82.1.el7.noarch —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-debug-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-debug-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-debug-devel-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-devel-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-doc-0:3.10.0-1062.82.1.el7.noarch —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-tools-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-tools-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:kernel-tools-libs-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:perf-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:perf-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:python-perf-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-7.7.AUS:python-perf-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:bpftool-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:kernel-debug-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:kernel-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:kernel-debuginfo-common-x86_64-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:kernel-tools-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:kernel-tools-libs-devel-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:perf-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-optional-7.7.AUS:python-perf-debuginfo-0:3.10.0-1062.82.1.el7.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2023-3776

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)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
CVE-2023-4128

This record is a duplicate of CVE-2023-4206, CVE-2023-4207, and CVE-2023-4208. Do not use this CVE record: CVE-2023-4128.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
CVE-2023-4206

There are 3 CVEs for the use-after-free flaw found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208. A local user could use any of these flaws to crash the system or potentially escalate their privileges on the system. Similar CVE-2023-4128 was rejected as a duplicate.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
CVE-2023-4207

There are 3 CVEs for the use-after-free flaw found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208. A local user could use any of these flaws to crash the system or potentially escalate their privileges on the system. Similar CVE-2023-4128 was rejected as a duplicate.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
CVE-2023-4208

There are 3 CVEs for the use-after-free flaw found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208. A local user could use any of these flaws to crash the system or potentially escalate their privileges on the system. Similar CVE-2023-4128 was rejected as a duplicate.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
CVE-2023-31436

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)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Fixed 27 products, the same list as for CVE-2023-3611
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2024:0262 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2225097 external
https://bugzilla.redhat.com/show_bug.cgi?id=2225191 external
https://bugzilla.redhat.com/show_bug.cgi?id=2225511 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2023-3611 self
https://bugzilla.redhat.com/show_bug.cgi?id=2225191 external
https://www.cve.org/CVERecord?id=CVE-2023-3611 external
https://nvd.nist.gov/vuln/detail/CVE-2023-3611 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://access.redhat.com/security/cve/CVE-2023-3776 self
https://bugzilla.redhat.com/show_bug.cgi?id=2225097 external
https://www.cve.org/CVERecord?id=CVE-2023-3776 external
https://nvd.nist.gov/vuln/detail/CVE-2023-3776 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://access.redhat.com/security/cve/CVE-2023-4128 self
https://bugzilla.redhat.com/show_bug.cgi?id=2261965 external
https://www.cve.org/CVERecord?id=CVE-2023-4128 external
https://nvd.nist.gov/vuln/detail/CVE-2023-4128 external
https://access.redhat.com/security/cve/CVE-2023-4206 external
https://access.redhat.com/security/cve/CVE-2023-4207 external
https://access.redhat.com/security/cve/CVE-2023-4208 external
https://access.redhat.com/security/cve/CVE-2023-4206 self
https://bugzilla.redhat.com/show_bug.cgi?id=2225511 external
https://www.cve.org/CVERecord?id=CVE-2023-4206 external
https://nvd.nist.gov/vuln/detail/CVE-2023-4206 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://lore.kernel.org/netdev/193d6cdf-d6c9-f9be… external
https://access.redhat.com/security/cve/CVE-2023-4207 self
https://www.cve.org/CVERecord?id=CVE-2023-4207 external
https://nvd.nist.gov/vuln/detail/CVE-2023-4207 external
https://access.redhat.com/security/cve/CVE-2023-4208 self
https://www.cve.org/CVERecord?id=CVE-2023-4208 external
https://nvd.nist.gov/vuln/detail/CVE-2023-4208 external
https://access.redhat.com/security/cve/CVE-2023-31436 self
https://bugzilla.redhat.com/show_bug.cgi?id=2192671 external
https://www.cve.org/CVERecord?id=CVE-2023-31436 external
https://nvd.nist.gov/vuln/detail/CVE-2023-31436 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
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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"
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          "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.",
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      "cve": "CVE-2023-3776",
      "cwe": {
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        {
          "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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      "title": "kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function"
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    {
      "cve": "CVE-2023-4128",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2023-07-24T00:00:00+00:00",
      "ids": [
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          "text": "2261965"
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          "category": "description",
          "text": "This record is a duplicate of CVE-2023-4206, CVE-2023-4207, and CVE-2023-4208. Do not use this CVE record: CVE-2023-4128.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "All CVE users should reference CVE-2023-4206, CVE-2023-4207, CVE-2023-4208 instead of this record. All references and descriptions in this record have been removed to prevent accidental usage.",
          "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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      "title": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route"
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          "title": "Vulnerability description"
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          "text": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route",
          "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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          "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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          "title": "Vulnerability description"
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          "category": "summary",
          "text": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route",
          "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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          "date": "2024-01-16T15:57:34+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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      "title": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route"
    },
    {
      "cve": "CVE-2023-4208",
      "cwe": {
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      "ids": [
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          "category": "description",
          "text": "There are 3 CVEs for the use-after-free flaw found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208. \r\nA local user could use any of these flaws to crash the system or potentially escalate their privileges on the system.\r\n\r\nSimilar CVE-2023-4128 was rejected as a duplicate.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route",
          "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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          "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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      "scores": [
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          "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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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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