RHSA-2018:3823

Vulnerability from csaf_redhat - Published: 2018-12-13 16:02 - Updated: 2025-11-21 18:07
Summary
Red Hat Security Advisory: kernel security and bug fix update
Severity
Moderate
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 5.9 Long Life. Red Hat Product Security has rated this update as having a security impact of Moderate. 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: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * Previously, on certain Intel 64 systems, the microcode contained a new model-specific register (MSR) that was not present in the older microcode running on CPUs that had not been updated yet. As a consequence, the system crashed due to a general protection fault on a CPU running the older microcode. This update fixes the bug by having the kernel use MSR access routines that handle the general protection fault. As a result, the system no longer crashes in the described scenario. (BZ#1652467)
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-2017-15265

A use-after-free vulnerability was found when issuing an ioctl to a sound device. This could allow a user to exploit a race condition and create memory corruption or possibly privilege escalation.

5.5 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-416 - Use After Free
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2018:3823
Workaround It is possible to prevent the affected code from being loaded by blacklisting the kernel module snd_seq. Instructions relating to how to blacklist a kernel module are shown here: https://access.redhat.com/solutions/41278 Alternatively a custom permission set can be created by udev, the correct permissions will depend on your use case. Please contact Red Hat customer support for creating a rule set that can minimize flaw exposure.
References
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          "text": "A use-after-free vulnerability was found when issuing an ioctl to a sound device. This could allow a user to exploit a race condition and create memory corruption or possibly privilege escalation.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "kernel: Use-after-free in snd_seq_ioctl_create_port()",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "This issue affects the Linux kernel packages as shipped with Red Hat\nEnterprise Linux 5,6, 7, realtime and MRG-2.\n\nRed Hat Enterprise Linux 5 has transitioned to Production phase 3.  \nDuring the Production 3 Phase, Critical impact Security Advisories (RHSAs) \nand selected Urgent Priority Bug Fix Advisories (RHBAs) may be released \nas they become available.\n\nThe official life cycle policy can be reviewed here:\n\nhttp://redhat.com/rhel/lifecycle\n\nFuture Linux kernel updates for the respective releases may address this issue.",
          "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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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.0"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: Use-after-free in snd_seq_ioctl_create_port()"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.