RHSA-2022:0622

Vulnerability from csaf_redhat - Published: 2022-02-22 17:02 - Updated: 2026-03-21 05:05
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: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466) * kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920) * kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155) * kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330) * kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942) * kernel: out of bounds write in hid-multitouch.c may lead to escalation of privilege (CVE-2020-0465) * kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564) * kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573) * kernel: possible use-after-free in bluetooth module (CVE-2021-3752) 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): * kernel-rt: update to the latest RHEL7.9.z12 source tree (BZ#2039101)
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.

A flaw was found in the Linux kernel’s multi-touch input system. An out-of-bounds write triggered by a use-after-free issue could lead to memory corruption or possible privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE-787 - Out-of-bounds Write
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-2022:0622
Workaround As the multitouch module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install hid-multitouch /bin/true" >> /etc/modprobe.d/disable-hid-multitouch.conf The system may need to be restarted if the hid-multitouch module is loaded. In most circumstances, a kernel modules will be unable to be unloaded while in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.

A flaw was found in the Linux kernel. A logic error in eventpoll.c can cause a use-after-free, leading to a local escalation of privilege with no additional execution privileges. User interaction is not needed for exploitation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

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-2022:0622
Workaround Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.

A vulnerability was found in unix_dgram_recvmsg in net/unix/af_unix.c in the Linux kernel's garbage collection for Unix domain socket file handlers. In this flaw, a missing cleanup may lead to a use-after-free due to a race problem. This flaw allows a local user to crash the system or escalate their privileges on the system. A read-after-free memory flaw was found in the Linux kernel's garbage collection for Unix domain socket file handlers in the way users call close() and fget() simultaneously and can potentially trigger a race condition. This flaw allows a local user to crash the system or escalate their privileges on the system.

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-2022:0622
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.

A flaw double-free memory corruption in the Linux kernel HCI device initialization subsystem was found in the way user attach malicious HCI TTY Bluetooth device. A local user could use this flaw to crash the system.

CWE-415 - Double 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-2022:0622
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.

A flaw use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system.

CWE-788 - Access of Memory Location After End of Buffer
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-2022:0622
Workaround Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising easThe required privileges is CAP_NET_ADMIN capabilities. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.e of use and deployment, applicability to widespread installation base or stability.

A use-after-free flaw was found in the Linux kernel’s Bluetooth subsystem in the way user calls connect to the socket and disconnect simultaneously due to a race condition. This flaw allows a user to crash the system or escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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-2022:0622
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 baser or stability. The possible solution is to disable Bluetooth completely: https://access.redhat.com/solutions/2682931

A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.

CWE-131 - Incorrect Calculation of Buffer Size
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-2022:0622
Workaround This issue can be mitigated by ensuring xfs_alloc_file_space is not called with "0" as an argument. This can be done with a SystemTap script (which resets "0" with XFS_BMAPI_PREALLOC), below are the steps: 1) Save the following script in a 'CVE-2021-4155.stp' file --- On Red Hat Enterprise Linux 6 --- probe module("xfs").function("xfs_alloc_file_space") { if ($alloc_type == 0) $alloc_type = 0x40; # XFS_BMAPI_PREALLOC } --- On Red Hat Enterprise Linux 6 --- --- On Red Hat Enterprise Linux 7 onwards --- probe module("xfs").function("xfs_alloc_file_space") { if ($alloc_type == 0) $alloc_type = 0x8; # XFS_BMAPI_PREALLOC } --- On Red Hat Enterprise Linux 7 onwards --- 2) Install systemtap package and its dependencies # yum install -y systemtap systemtap-runtime # yum install -y kernel-devel kernel-debuginfo 3) Build the mitigation kernel module as root. # stap -r `uname -r` -m cve_2021_4155.ko -g CVE-2021-4155.stp -p4 4) Load the mitigation module as root # staprun -L cve_2021_4155.ko What is SystemTap and how to use it? https://access.redhat.com/solutions/5441

A random memory access flaw was found in the Linux kernel’s GPU i915 kernel driver functionality in the way a user may run malicious code on the GPU. This flaw allows a local user to crash the system or escalate their privileges on the system.

CWE-281 - Improper Preservation of Permissions
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-2022:0622
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.

A use-after-free flaw was found in the Linux kernel’s vmw_execbuf_copy_fence_user function in drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c in vmwgfx. This flaw allows a local attacker with user privileges to cause a privilege escalation problem.

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-2022:0622
Workaround Mitigation for this issue is to skip loading the affected module vmwgfx onto the system until we have a fix available. This can be done by a blacklist mechanism and ensures the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~
References
https://access.redhat.com/errata/RHSA-2022:0622 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=1920471 external
https://bugzilla.redhat.com/show_bug.cgi?id=1920480 external
https://bugzilla.redhat.com/show_bug.cgi?id=1964139 external
https://bugzilla.redhat.com/show_bug.cgi?id=1966578 external
https://bugzilla.redhat.com/show_bug.cgi?id=1999544 external
https://bugzilla.redhat.com/show_bug.cgi?id=2031930 external
https://bugzilla.redhat.com/show_bug.cgi?id=2034813 external
https://bugzilla.redhat.com/show_bug.cgi?id=2042404 external
https://bugzilla.redhat.com/show_bug.cgi?id=2044809 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2020-0465 self
https://bugzilla.redhat.com/show_bug.cgi?id=1920471 external
https://www.cve.org/CVERecord?id=CVE-2020-0465 external
https://nvd.nist.gov/vuln/detail/CVE-2020-0465 external
https://access.redhat.com/security/cve/CVE-2020-0466 self
https://bugzilla.redhat.com/show_bug.cgi?id=1920480 external
https://www.cve.org/CVERecord?id=CVE-2020-0466 external
https://nvd.nist.gov/vuln/detail/CVE-2020-0466 external
https://access.redhat.com/security/cve/CVE-2021-0920 self
https://bugzilla.redhat.com/show_bug.cgi?id=2031930 external
https://www.cve.org/CVERecord?id=CVE-2021-0920 external
https://nvd.nist.gov/vuln/detail/CVE-2021-0920 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://www.cisa.gov/known-exploited-vulnerabilit… external
https://access.redhat.com/security/cve/CVE-2021-3564 self
https://bugzilla.redhat.com/show_bug.cgi?id=1964139 external
https://www.cve.org/CVERecord?id=CVE-2021-3564 external
https://nvd.nist.gov/vuln/detail/CVE-2021-3564 external
https://www.openwall.com/lists/oss-security/2021/… external
https://access.redhat.com/security/cve/CVE-2021-3573 self
https://bugzilla.redhat.com/show_bug.cgi?id=1966578 external
https://www.cve.org/CVERecord?id=CVE-2021-3573 external
https://nvd.nist.gov/vuln/detail/CVE-2021-3573 external
https://git.kernel.org/pub/scm/linux/kernel/git/b… external
https://www.openwall.com/lists/oss-security/2021/… external
https://access.redhat.com/security/cve/CVE-2021-3752 self
https://bugzilla.redhat.com/show_bug.cgi?id=1999544 external
https://www.cve.org/CVERecord?id=CVE-2021-3752 external
https://nvd.nist.gov/vuln/detail/CVE-2021-3752 external
https://lore.kernel.org/lkml/20211115165435.13324… external
https://www.openwall.com/lists/oss-security/2021/… external
https://access.redhat.com/security/cve/CVE-2021-4155 self
https://bugzilla.redhat.com/show_bug.cgi?id=2034813 external
https://www.cve.org/CVERecord?id=CVE-2021-4155 external
https://nvd.nist.gov/vuln/detail/CVE-2021-4155 external
https://git.kernel.org/pub/scm/linux/kernel/git/t… external
https://access.redhat.com/security/cve/CVE-2022-0330 self
https://bugzilla.redhat.com/show_bug.cgi?id=2042404 external
https://www.cve.org/CVERecord?id=CVE-2022-0330 external
https://nvd.nist.gov/vuln/detail/CVE-2022-0330 external
https://www.openwall.com/lists/oss-security/2022/… external
https://access.redhat.com/security/cve/CVE-2022-22942 self
https://bugzilla.redhat.com/show_bug.cgi?id=2044809 external
https://www.cve.org/CVERecord?id=CVE-2022-22942 external
https://nvd.nist.gov/vuln/detail/CVE-2022-22942 external
Acknowledgments
ckSec HaoXiong, LinMa
NSFOCUS Security Team Likang Luo
Virtuozzo Kernel team Kirill Tkhai

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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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          "title": "Vulnerability description"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-4155"
        },
        {
          "category": "external",
          "summary": "RHBZ#2034813",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2034813"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-4155",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-4155"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-4155",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4155"
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          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79"
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      "release_date": "2022-01-10T06:36:00+00:00",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: failing usercopy allows for use-after-free exploitation"
    }
  ]
}


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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.


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