Common Weakness Enumeration

CWE-476

Allowed

NULL Pointer Dereference

Abstraction: Base · Status: Stable

API response cwe.mitre.org

The product dereferences a pointer that it expects to be valid but is NULL.

6345 vulnerabilities reference this CWE, most recent first.

CVE-2023-3354 (GCVE-0-2023-3354)

Vulnerability from cvelistv5 – Published: 2023-07-11 16:16 – Updated: 2025-02-13 16:55
VLAI
Title
Improper i/o watch removal in tls handshake can lead to remote unauthenticated denial of service
Summary
A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Date Public
2023-06-28 00:00
Credits
Red Hat would like to thank jiangyegen (Huawei Vulnerability Management Center) and yexiao7 (Huawei Vulnerability Management Center) for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2023-3338 (GCVE-0-2023-3338)

Vulnerability from cvelistv5 – Published: 2023-06-30 00:00 – Updated: 2025-03-05 18:55
VLAI
Title
Crash due to a null pointer dereference in the dn_nsp_send function
Summary
A null pointer dereference flaw was found in the Linux kernel's DECnet networking protocol. This issue could allow a remote user to crash the system.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Date Public
2023-06-26 00:00
Credits
Red Hat would like to thank Davide Ornaghi (Betrusted Srl) for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2023-3316 (GCVE-0-2023-3316)

Vulnerability from cvelistv5 – Published: 2023-06-19 11:10 – Updated: 2025-11-03 20:35
VLAI
Title
A NULL pointer dereference in TIFFClose() is caused by a failure to open an output file (non-existent path or a path that requires permissions like /dev/null) while specifying zones.
Summary
A NULL pointer dereference in TIFFClose() is caused by a failure to open an output file (non-existent path or a path that requires permissions like /dev/null) while specifying zones.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
libtiff libtiff Affected: 3.9.0 , < 4.5.1 (git)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2023-3220 (GCVE-0-2023-3220)

Vulnerability from cvelistv5 – Published: 2023-06-20 00:00 – Updated: 2025-03-11 14:28
VLAI
Summary
An issue was discovered in the Linux kernel through 6.1-rc8. dpu_crtc_atomic_check in drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c lacks check of the return value of kzalloc() and will cause the NULL Pointer Dereference.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Linux kernel Affected: 6.2.0-rc2
Show details on NVD website
To clipboard 

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CVE-2023-3212 (GCVE-0-2023-3212)

Vulnerability from cvelistv5 – Published: 2023-06-23 00:00 – Updated: 2024-08-02 06:48
VLAI
Summary
A NULL pointer dereference issue was found in the gfs2 file system in the Linux kernel. It occurs on corrupt gfs2 file systems when the evict code tries to reference the journal descriptor structure after it has been freed and set to NULL. A privileged local user could use this flaw to cause a kernel panic.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Linux kernel (gfs2 file system) Affected: Fixed in kernel 6.4-rc2
Show details on NVD website
To clipboard 

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CVE-2023-3106 (GCVE-0-2023-3106)

Vulnerability from cvelistv5 – Published: 2023-07-12 08:27 – Updated: 2025-11-20 17:30
VLAI
Title
Kernel: netlink socket crash (null pointer deref) in netlink_dump function
Summary
A NULL pointer dereference vulnerability was found in netlink_dump. This issue can occur when the Netlink socket receives the message(sendmsg) for the XFRM_MSG_GETSA, XFRM_MSG_GETPOLICY type message, and the DUMP flag is set and can cause a denial of service or possibly another unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is unlikely.
Severity
6.6 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Date Public
2016-07-18 00:00
Show details on NVD website
To clipboard 

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CVE-2023-3012 (GCVE-0-2023-3012)

Vulnerability from cvelistv5 – Published: 2023-05-31 00:00 – Updated: 2025-01-09 17:12
VLAI
Title
NULL Pointer Dereference in gpac/gpac
Summary
NULL Pointer Dereference in GitHub repository gpac/gpac prior to 2.2.2.
Severity
5.3 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
gpac gpac/gpac Affected: unspecified , < 2.2.2 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2023-2953 (GCVE-0-2023-2953)

Vulnerability from cvelistv5 – Published: 2023-05-30 00:00 – Updated: 2025-01-10 21:28
VLAI
Summary
A vulnerability was found in openldap. This security flaw causes a null pointer dereference in ber_memalloc_x() function.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a openldap Affected: openldap-2.4
Show details on NVD website
To clipboard 

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CVE-2023-2908 (GCVE-0-2023-2908)

Vulnerability from cvelistv5 – Published: 2023-06-30 00:00 – Updated: 2025-11-03 20:35
VLAI
Title
Libtiff: null pointer dereference in tif_dir.c
Summary
A null pointer dereference issue was found in Libtiff's tif_dir.c file. This issue may allow an attacker to pass a crafted TIFF image file to the tiffcp utility which triggers a runtime error that causes undefined behavior. This will result in an application crash, eventually leading to a denial of service.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Date Public
2023-06-30 00:00
Show details on NVD website
To clipboard 

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CVE-2023-2898 (GCVE-0-2023-2898)

Vulnerability from cvelistv5 – Published: 2023-05-26 00:00 – Updated: 2024-10-15 17:12
VLAI
Summary
There is a null-pointer-dereference flaw found in f2fs_write_end_io in fs/f2fs/data.c in the Linux kernel. This flaw allows a local privileged user to cause a denial of service problem.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Kernel Affected: NA
Show details on NVD website
To clipboard 

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      "descriptions": [
        {
          "lang": "en",
          "value": "There is a null-pointer-dereference flaw found in f2fs_write_end_io in fs/f2fs/data.c in the Linux kernel. This flaw allows a local privileged user to cause a denial of service problem."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-10-19T23:06:18.459Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "url": "https://lore.kernel.org/linux-f2fs-devel/20230522124203.3838360-1-chao%40kernel.org/"
        },
        {
          "name": "DSA-5480",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2023/dsa-5480"
        },
        {
          "name": "DSA-5492",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2023/dsa-5492"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20230929-0002/"
        },
        {
          "name": "[debian-lts-announce] 20231019 [SECURITY] [DLA 3623-1] linux-5.10 security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2023-2898",
    "datePublished": "2023-05-26T00:00:00.000Z",
    "dateReserved": "2023-05-25T00:00:00.000Z",
    "dateUpdated": "2024-10-15T17:12:06.888Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}
Mitigation MIT-56
Implementation

For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].

Mitigation
Requirements

Select a programming language that is not susceptible to these issues.

Mitigation
Implementation

Check the results of all functions that return a value and verify that the value is non-null before acting upon it.

Mitigation
Architecture and Design

Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.

Mitigation
Implementation

Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.

No CAPEC attack patterns related to this CWE.

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