RHSA-2016_1532

Vulnerability from csaf_redhat - Published: 2016-08-02 13:52 - Updated: 2024-11-14 19:56
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5. 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. * A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important) * The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application. (CVE-2015-8660, Moderate) Red Hat would like to thank Nathan Williams for reporting CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.). The kernel-rt packages have been upgraded to upstream version 3.10.0-327.rt56.194.el6rt, which provides a number of bug fixes over the previous version. (BZ#1343658) This update also fixes the following bugs: * Previously, use of the get/put_cpu_var() function in function refill_stock() from the memcontrol cgroup code lead to a "scheduling while atomic" warning. With this update, refill_stock() uses the get/put_cpu_light() function instead, and the warnings no longer appear. (BZ#1348710) * Prior to this update, if a real time task pinned to a given CPU was taking 100% of the CPU time, then calls to the lru_add_drain_all() function on other CPUs blocked for an undetermined amount of time. This caused latencies and undesired side effects. With this update, lru_add_drain_all() has been changed to drain the LRU pagevecs of remote CPUs. (BZ#1348711)
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-2015-8660

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

6.0 ()
AV:L/AC:H/Au:S/C:C/I:C/A:C
CWE-732 - Incorrect Permission Assignment for Critical Resource
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-2016:1532
CVE-2016-4470

A flaw was found in the Linux kernel's keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation.

7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-253 - Incorrect Check of Function Return Value
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-2016:1532
References
Acknowledgments
Nathan Williams
Red Hat David Howells
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.194.el6rt.src",
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-common-x86_64-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-devel-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-327.rt56.194.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-327.rt56.194.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-327.rt56.194.el6rt.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path"
    }
  ]
}


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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.