Vulnerability-Lookup

RHSA-2021:2316

Vulnerability from csaf_redhat - Published: 2021-06-08 22:44 - Updated: 2026-02-25 18:32

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 Linux 7. 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. Security Fix(es): * kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362) * kernel: Use after free via PI futex state (CVE-2021-3347) * kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c (CVE-2020-8648) * kernel: Improper input validation in some Intel(R) Graphics Drivers (CVE-2020-12363) * kernel: Null pointer dereference in some Intel(R) Graphics Drivers (CVE-2020-12364) * kernel: Speculation on pointer arithmetic against bpf_context pointer (CVE-2020-27170) 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. Bug Fix(es): * lru-add-drain workqueue on RT is allocated without being used (BZ#1894587) * kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1953118)

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-2020-8648

A use-after-free flaw was found in the Linux kernel console driver when using the copy-paste buffer. This flaw allows a local user to crash the system.

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-2021:2316

Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVE-2020-12362

A flaw was found in the Linux kernel. An integer overflow in the firmware for some Intel(R) Graphics Drivers may allow a privileged user to potentially enable an escalation of privilege via local access. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE-190 - Integer Overflow or Wraparound

Workaround Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example.

CVE-2020-12363

A flaw was found in the Linux kernel. Improper input validation in some Intel(R) Graphics Drivers may allow a privileged user to potentially enable a denial of service via local access.

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-20 - Improper Input Validation

CVE-2020-12364

Null pointer reference in some Intel(R) Graphics Drivers for Microsoft Windows and the Linux kernel may allow a privileged user to potentially enable a denial of service via local access.

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 - NULL Pointer Dereference

CVE-2020-27170

A flaw was found in the Linux kernels eBPF verification code. By default accessing the eBPF verifier is only accessible to privileged users with CAP_SYS_ADMIN. A local user with the ability to insert eBPF instructions can use the eBPF verifier to abuse a spectre like flaw where they can infer all system memory.

4.7 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Workaround The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space. For the Red Hat Enterprise Linux 7 the eBPF for unprivileged users is always disabled. For the Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command: # cat /proc/sys/kernel/unprivileged_bpf_disabled The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw. A kernel update will be required to mitigate the flaw for the root or users with CAP_SYS_ADMIN capabilities.

CVE-2021-3347

A flaw was found in the Linux kernel. A use-after-free memory flaw in the Fast Userspace Mutexes functionality allowing a local user to crash the system or escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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

References

URL

Category

	https://access.redhat.com/errata/RHSA-2021:2316	self
	https://access.redhat.com/security/updates/classi…	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1802559	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1894587	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1922249	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1930246	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1930249	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1930251	external
	https://bugzilla.redhat.com/show_bug.cgi?id=1940627	external
	https://security.access.redhat.com/data/csaf/v2/a…	self
	https://access.redhat.com/security/cve/CVE-2020-8648	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1802559	external
	https://www.cve.org/CVERecord?id=CVE-2020-8648	external
	https://nvd.nist.gov/vuln/detail/CVE-2020-8648	external
	https://access.redhat.com/security/cve/CVE-2020-12362	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1930246	external
	https://www.cve.org/CVERecord?id=CVE-2020-12362	external
	https://nvd.nist.gov/vuln/detail/CVE-2020-12362	external
	https://access.redhat.com/security/cve/CVE-2020-12363	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1930249	external
	https://www.cve.org/CVERecord?id=CVE-2020-12363	external
	https://nvd.nist.gov/vuln/detail/CVE-2020-12363	external
	https://www.intel.com/content/www/us/en/security-…	external
	https://access.redhat.com/security/cve/CVE-2020-12364	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1930251	external
	https://www.cve.org/CVERecord?id=CVE-2020-12364	external
	https://nvd.nist.gov/vuln/detail/CVE-2020-12364	external
	https://access.redhat.com/security/cve/CVE-2020-27170	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1940627	external
	https://www.cve.org/CVERecord?id=CVE-2020-27170	external
	https://nvd.nist.gov/vuln/detail/CVE-2020-27170	external
	https://access.redhat.com/security/cve/CVE-2021-3347	self
	https://bugzilla.redhat.com/show_bug.cgi?id=1922249	external
	https://www.cve.org/CVERecord?id=CVE-2021-3347	external
	https://nvd.nist.gov/vuln/detail/CVE-2021-3347	external

JSON

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          "text": "A flaw was found in the Linux kernel. An integer overflow in the firmware for some Intel(R) Graphics Drivers may allow a privileged user to potentially enable an escalation of privilege via local access. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
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CVE-2021-3347 (GCVE-0-2021-3347)

Vulnerability from cvelistv5 – Published: 2021-01-29 16:56 – Updated: 2026-02-25 17:10

Summary

An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

Assigner

mitre

References

URL

Tags

	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2021/01/29/5	mailing-listx_refsource_MLIST
	http://www.openwall.com/lists/oss-security/2021/01/29/4	mailing-listx_refsource_MLIST
	http://www.openwall.com/lists/oss-security/2021/02/01/4	mailing-listx_refsource_MLIST
	https://www.debian.org/security/2021/dsa-4843	vendor-advisoryx_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
	https://security.netapp.com/advisory/ntap-2021030…	x_refsource_CONFIRM
	https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

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CVE-2020-12363 (GCVE-0-2020-12363)

Vulnerability from cvelistv5 – Published: 2021-02-17 00:00 – Updated: 2024-08-04 11:56

Summary

Improper input validation in some Intel(R) Graphics Drivers for Windows* before version 26.20.100.7212 and before Linux kernel version 5.5 may allow a privileged user to potentially enable a denial of service via local access.

Severity ?

No CVSS data available.

CWE

denial of service

Assigner

intel

References

URL

Tags

	https://www.intel.com/content/www/us/en/security-…
	https://lists.debian.org/debian-lts-announce/2023…	mailing-list

Impacted products

	Vendor	Product	Version
	n/a	Intel(R) Graphics Drivers for Windows* before version 26.20.100.7212 and	Affected: before version 26.20.100.7212 and before Linux kernel version 5.5

Show details on NVD website

JSON

To clipboard

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CVE-2020-12364 (GCVE-0-2020-12364)

Vulnerability from cvelistv5 – Published: 2021-02-17 00:00 – Updated: 2024-08-04 11:56

Summary

Null pointer reference in some Intel(R) Graphics Drivers for Windows* before version 26.20.100.7212 and before version Linux kernel version 5.5 may allow a privileged user to potentially enable a denial of service via local access.

Severity ?

No CVSS data available.

CWE

denial of service

Assigner

intel

References

URL

Tags

	https://www.intel.com/content/www/us/en/security-…
	https://lists.debian.org/debian-lts-announce/2023…	mailing-list

Impacted products

	Vendor	Product	Version
	n/a	Intel(R) Graphics Drivers for Windows* before version 26.20.100.7212 and	Affected: before version 26.20.100.7212 and before version Linux kernel version 5.5

Show details on NVD website

JSON

To clipboard

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CVE-2020-8648 (GCVE-0-2020-8648)

Vulnerability from cvelistv5 – Published: 2020-02-06 00:06 – Updated: 2024-08-04 10:03

Summary

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://bugzilla.kernel.org/show_bug.cgi?id=206361	x_refsource_MISC
	http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
	https://usn.ubuntu.com/4344-1/	vendor-advisoryx_refsource_UBUNTU
	https://usn.ubuntu.com/4345-1/	vendor-advisoryx_refsource_UBUNTU
	https://usn.ubuntu.com/4342-1/	vendor-advisoryx_refsource_UBUNTU
	https://usn.ubuntu.com/4346-1/	vendor-advisoryx_refsource_UBUNTU
	https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
	https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
	https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
	https://www.debian.org/security/2020/dsa-4698	vendor-advisoryx_refsource_DEBIAN
	https://security.netapp.com/advisory/ntap-2020092…	x_refsource_CONFIRM

Show details on NVD website

JSON

To clipboard

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CVE-2020-27170 (GCVE-0-2020-27170)

Vulnerability from cvelistv5 – Published: 2021-03-20 21:30 – Updated: 2024-08-04 16:11

Summary

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

	https://cdn.kernel.org/pub/linux/kernel/v5.x/Chan…	x_refsource_MISC
	https://www.openwall.com/lists/oss-security/2021/…	x_refsource_MISC
	https://git.kernel.org/pub/scm/linux/kernel/git/t…	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
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	http://www.openwall.com/lists/oss-security/2021/03/24/4	mailing-listx_refsource_MLIST
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
	http://packetstormsecurity.com/files/162117/Kerne…	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2020-12362 (GCVE-0-2020-12362)

Vulnerability from cvelistv5 – Published: 2021-02-17 00:00 – Updated: 2024-08-04 11:56

Summary

Integer overflow in the firmware for some Intel(R) Graphics Drivers for Windows * before version 26.20.100.7212 and before Linux kernel version 5.5 may allow a privileged user to potentially enable an escalation of privilege via local access.

Severity ?

No CVSS data available.

CWE

escalation of privilege

Assigner

intel

References

URL

Tags

	https://www.intel.com/content/www/us/en/security-…
	https://lists.debian.org/debian-lts-announce/2023…	mailing-list

Impacted products

	Vendor	Product	Version
	n/a	Intel(R) Graphics Drivers for Windows * before version 26.20.100.7212 and	Affected: before version 26.20.100.7212 and before Linux kernel version 5.5

Show details on NVD website

JSON

To clipboard

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            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/04/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Intel(R) Graphics Drivers for Windows * before version 26.20.100.7212 and",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "before version 26.20.100.7212 and before Linux kernel version 5.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Integer overflow in the firmware for some Intel(R) Graphics Drivers for Windows * before version 26.20.100.7212 and before Linux kernel version 5.5 may allow a privileged user to potentially enable an escalation of privilege via local access."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "escalation of privilege",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-04-01T00:00:00.000Z",
        "orgId": "6dda929c-bb53-4a77-a76d-48e79601a1ce",
        "shortName": "intel"
      },
      "references": [
        {
          "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00438.html"
        },
        {
          "name": "[debian-lts-announce] 20230401 [SECURITY] [DLA 3380-1] firmware-nonfree LTS new upstream version (security updates and newer firmware for Linux 5.10)",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/04/msg00002.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6dda929c-bb53-4a77-a76d-48e79601a1ce",
    "assignerShortName": "intel",
    "cveId": "CVE-2020-12362",
    "datePublished": "2021-02-17T00:00:00.000Z",
    "dateReserved": "2020-04-28T00:00:00.000Z",
    "dateUpdated": "2024-08-04T11:56:51.663Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Tags

Taxonomy of the tags.

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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.

Action not permitted

RHSA-2021:2316

CVE-2021-3347 (GCVE-0-2021-3347)

CVE-2020-12363 (GCVE-0-2020-12363)

CVE-2020-12364 (GCVE-0-2020-12364)

CVE-2020-8648 (GCVE-0-2020-8648)

CVE-2020-27170 (GCVE-0-2020-27170)

CVE-2020-12362 (GCVE-0-2020-12362)

Tags

Sightings

Nomenclature