Common Weakness Enumeration

CWE-667

Allowed-with-Review

Improper Locking

Abstraction: Class · Status: Draft

API response cwe.mitre.org

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

692 vulnerabilities reference this CWE, most recent first.

CVE-2021-20315 (GCVE-0-2021-20315)

Vulnerability from cvelistv5 – Published: 2022-02-18 00:00 – Updated: 2024-08-03 17:37
VLAI
Summary
A locking protection bypass flaw was found in some versions of gnome-shell as shipped within CentOS Stream 8, when the "Application menu" or "Window list" GNOME extensions are enabled. This flaw allows a physical attacker who has access to a locked system to kill existing applications and start new ones as the locked user, even if the session is still locked.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a gnome-shell Affected: gnome-shell 3.32.2-40.el8
Show details on NVD website
To clipboard 

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CVE-2021-20291 (GCVE-0-2021-20291)

Vulnerability from cvelistv5 – Published: 2021-04-01 17:49 – Updated: 2024-08-03 17:37
VLAI
Summary
A deadlock vulnerability was found in 'github.com/containers/storage' in versions before 1.28.1. When a container image is processed, each layer is unpacked using `tar`. If one of those layers is not a valid `tar` archive this causes an error leading to an unexpected situation where the code indefinitely waits for the tar unpacked stream, which never finishes. An attacker could use this vulnerability to craft a malicious image, which when downloaded and stored by an application using containers/storage, would then cause a deadlock leading to a Denial of Service (DoS).
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a containers/storage Affected: containers/storage 1.28.1
Show details on NVD website
To clipboard 

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CVE-2021-4149 (GCVE-0-2021-4149)

Vulnerability from cvelistv5 – Published: 2022-03-23 19:46 – Updated: 2024-08-03 17:16
VLAI
Summary
A vulnerability was found in btrfs_alloc_tree_b in fs/btrfs/extent-tree.c in the Linux kernel due to an improper lock operation in btrfs. In this flaw, a user with a local privilege may cause a denial of service (DOS) due to a deadlock problem.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: kernel 5.15 rc6
Show details on NVD website
To clipboard 

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CVE-2021-4147 (GCVE-0-2021-4147)

Vulnerability from cvelistv5 – Published: 2022-03-25 00:00 – Updated: 2024-08-03 17:16
VLAI
Summary
A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a libvirt Affected: libvirt 2.33.0
Show details on NVD website
To clipboard 

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CVE-2021-3735 (GCVE-0-2021-3735)

Vulnerability from cvelistv5 – Published: 2022-08-26 15:25 – Updated: 2025-02-28 13:07
VLAI
Summary
A deadlock issue was found in the AHCI controller device of QEMU. It occurs on a software reset (ahci_reset_port) while handling a host-to-device Register FIS (Frame Information Structure) packet from the guest. A privileged user inside the guest could use this flaw to hang the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
  • CWE-667 - - Improper Locking -> CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU Affected: Not Known
Show details on NVD website
To clipboard 

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CVE-2021-3667 (GCVE-0-2021-3667)

Vulnerability from cvelistv5 – Published: 2022-03-02 00:00 – Updated: 2025-02-13 16:28
VLAI
Summary
An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly released on ACL permission failure. Clients connecting to the read-write socket with limited ACL permissions could use this flaw to acquire the lock and prevent other users from accessing storage pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a libvirt Affected: Fixedin - libvert v7.6.0-rc1 and above
Show details on NVD website
To clipboard 

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CVE-2019-14898 (GCVE-0-2019-14898)

Vulnerability from cvelistv5 – Published: 2020-05-08 13:50 – Updated: 2024-08-05 00:26
VLAI
Summary
The fix for CVE-2019-11599, affecting the Linux kernel before 5.0.10 was not complete. A local user could use this flaw to obtain sensitive information, cause a denial of service, or possibly have other unspecified impacts by triggering a race condition with mmget_not_zero or get_task_mm calls.
Severity
7 (High)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux kernel kernel Affected: < 5.0.10
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-3901 (GCVE-0-2019-3901)

Vulnerability from cvelistv5 – Published: 2019-04-22 15:22 – Updated: 2024-08-04 19:26
VLAI
Summary
A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.
Severity
5.6 (Medium)
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
The Linux Foundation kernel Affected: older then 4.8
Create a notification for this product.
Show details on NVD website
To clipboard 

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GHSA-22GP-7W9X-C2XX

Vulnerability from github – Published: 2024-05-20 12:30 – Updated: 2025-09-23 18:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

drm/ast: Fix soft lockup

There is a while-loop in ast_dp_set_on_off() that could lead to infinite-loop. This is because the register, VGACRI-Dx, checked in this API is a scratch register actually controlled by a MCU, named DPMCU, in BMC.

These scratch registers are protected by scu-lock. If suc-lock is not off, DPMCU can not update these registers and then host will have soft lockup due to never updated status.

DPMCU is used to control DP and relative registers to handshake with host's VGA driver. Even the most time-consuming task, DP's link training, is less than 100ms. 200ms should be enough.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35952"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35768baf0fdfc47ede42d899506bad78450e9294"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a6fea3fcb577a543ef67683ca7105bde49a38fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a81b2acd43e24e419f65df97348c76a5a1496066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc004f5038220b1891ef4107134ccae44be55109"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-22JF-974V-HF7J

Vulnerability from github – Published: 2022-05-24 17:46 – Updated: 2025-10-22 00:32
VLAI
Details

A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited..

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-1782"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-02T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "A race condition was addressed with improved locking. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited..",
  "id": "GHSA-22jf-974v-hf7j",
  "modified": "2025-10-22T00:32:05Z",
  "published": "2022-05-24T17:46:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1782"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/en-us/HT212146"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/en-us/HT212147"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/en-us/HT212148"
    },
    {
      "type": "WEB",
      "url": "https://support.apple.com/en-us/HT212149"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1782"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}
Mitigation
Implementation

Strategy: Libraries or Frameworks

Use industry standard APIs to implement locking mechanism.

CAPEC-25: Forced Deadlock

The adversary triggers and exploits a deadlock condition in the target software to cause a denial of service. A deadlock can occur when two or more competing actions are waiting for each other to finish, and thus neither ever does. Deadlock conditions can be difficult to detect.

CAPEC-26: Leveraging Race Conditions

The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.

CAPEC-27: Leveraging Race Conditions via Symbolic Links

This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to them. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file they will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.

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