RHSA-2016:1532

Vulnerability from csaf_redhat - Published: 2016-08-02 13:52 - Updated: 2026-06-28 12:27
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.

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.

CWE-732 - Incorrect Permission Assignment for Critical Resource
Affected products
Product Identifier Version Remediation
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.194.el6rt.src —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-debuginfo-common-x86_64-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-devel-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-327.rt56.194.el6rt.noarch —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-327.rt56.194.el6rt.noarch —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Unresolved product id: 6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-327.rt56.194.el6rt.x86_64 —
Vendor Fix fix
Threats
Impact Moderate

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.

CWE-253 - Incorrect Check of Function Return Value
Affected products
Fixed 16 products, the same list as for CVE-2015-8660
Threats
Impact Important

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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2016:1532"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.9,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "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:3.0/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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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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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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