Common Weakness Enumeration

CWE-416

Allowed

Use After Free

Abstraction: Variant · Status: Stable

API response cwe.mitre.org

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

9821 vulnerabilities reference this CWE, most recent first.

CVE-2021-3975 (GCVE-0-2021-3975)

Vulnerability from cvelistv5 – Published: 2022-08-23 00:00 – Updated: 2024-08-03 17:09
VLAI
Summary
A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial of service attack by causing the libvirt daemon to crash.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a libvirt Affected: Fixed in libvirt v7.1.0
Show details on NVD website
To clipboard 

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CVE-2021-3974 (GCVE-0-2021-3974)

Vulnerability from cvelistv5 – Published: 2021-11-19 00:00 – Updated: 2024-08-03 17:09
VLAI
Title
Use After Free in vim/vim
Summary
vim is vulnerable to Use After Free
Severity
7.3 (High)
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
vim vim/vim Affected: unspecified , < 8.2.3612 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3962 (GCVE-0-2021-3962)

Vulnerability from cvelistv5 – Published: 2021-11-19 16:11 – Updated: 2024-08-03 17:09
VLAI
Summary
A flaw was found in ImageMagick where it did not properly sanitize certain input before using it to invoke convert processes. This flaw allows an attacker to create a specially crafted image that leads to a use-after-free vulnerability when processed by ImageMagick. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a ImageMagick Affected: 7.1.0-14
Show details on NVD website
To clipboard 

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CVE-2021-3929 (GCVE-0-2021-3929)

Vulnerability from cvelistv5 – Published: 2022-08-25 19:36 – Updated: 2025-02-28 13:07
VLAI
Summary
A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU Affected: Fixed in qemu-kvm 7.0.0-rc0
Show details on NVD website
To clipboard 

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CVE-2021-3796 (GCVE-0-2021-3796)

Vulnerability from cvelistv5 – Published: 2021-09-15 00:00 – Updated: 2024-08-03 17:09
VLAI
Title
Use After Free in vim/vim
Summary
vim is vulnerable to Use After Free
Severity
8.2 (High)
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
vim vim/vim Affected: unspecified , ≤ 8.2.3428 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3760 (GCVE-0-2021-3760)

Vulnerability from cvelistv5 – Published: 2022-02-16 18:35 – Updated: 2024-08-03 17:09
VLAI
Summary
A flaw was found in the Linux kernel. A use-after-free vulnerability in the NFC stack can lead to a threat to confidentiality, integrity, and system availability.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: kernel 5.14.15-100.fc33, kernel 5.14.15-200.fc34, kernel 5.14.15-300.fc35
Show details on NVD website
To clipboard 

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CVE-2021-3752 (GCVE-0-2021-3752)

Vulnerability from cvelistv5 – Published: 2022-02-16 18:35 – Updated: 2024-08-03 17:09
VLAI
Summary
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.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: kernel 5.15.3
Show details on NVD website
To clipboard 

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CVE-2021-3750 (GCVE-0-2021-3750)

Vulnerability from cvelistv5 – Published: 2022-05-02 18:48 – Updated: 2024-08-03 17:09
VLAI
Summary
A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU Affected: QEMU before version 7.0.0
Show details on NVD website
To clipboard 

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CVE-2021-3748 (GCVE-0-2021-3748)

Vulnerability from cvelistv5 – Published: 2022-03-23 19:46 – Updated: 2024-08-03 17:09
VLAI
Summary
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a QEMU (virtio-net) Affected: Affects qemu v0.10.0 and above, Fixed In – v6.2.0-rc0 and above.
Show details on NVD website
To clipboard 

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CVE-2021-3738 (GCVE-0-2021-3738)

Vulnerability from cvelistv5 – Published: 2022-03-02 00:00 – Updated: 2024-08-03 17:01
VLAI
Summary
In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a samba Affected: Affects all versions since samba 4.0 | Fixedin samba v4.15.2, v4.14.10 and v4.13.14
Show details on NVD website
To clipboard 

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        },
        {
          "url": "https://bugzilla.samba.org/show_bug.cgi?id=14468"
        },
        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2021726"
        },
        {
          "name": "GLSA-202309-06",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202309-06"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-3738",
    "datePublished": "2022-03-02T00:00:00.000Z",
    "dateReserved": "2021-08-26T00:00:00.000Z",
    "dateUpdated": "2024-08-03T17:01:07.949Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}
Mitigation
Architecture and Design

Strategy: Language Selection

Choose a language that provides automatic memory management.

Mitigation
Implementation

Strategy: Attack Surface Reduction

When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

No CAPEC attack patterns related to this CWE.

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