CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6678 vulnerabilities reference this CWE, most recent first.
GHSA-9VCF-H83P-JGHM
Vulnerability from github – Published: 2026-07-22 15:31 – Updated: 2026-07-22 15:31In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when 'serve-expired: yes' is set together with a 'response-ip: redirect' /'response-ip-data: CNAME ' rule (or the RPZ 'rpz-cname-override' equivalent), a remote client who controls any delegated domain can crash the daemon. The serve-expired-client-timeout callback runs a two-pass loop to chase the respip-generated CNAME alias; on the second pass it resets 'alias_rrset' but not 'partial_rep'. Later, this inconsistency leads to a NULL pointer dereference and an eventual crash. A malicious actor can exploit the vulnerability by controlling any zone that replies with an A/AAAA record that falls inside the configured response-ip/rpz subnet. By delaying the answer when the previous record has expired, the vulnerable path of 'serve-expired-client-timeout' is taken leading to denial of service via the server crash.
{
"affected": [],
"aliases": [
"CVE-2026-55717"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-22T14:17:21Z",
"severity": "MODERATE"
},
"details": "In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when \u0027serve-expired: yes\u0027 is set together with a \u0027response-ip: \u003cnet\u003e redirect\u0027 /\u0027response-ip-data: \u003cnet\u003e CNAME \u003ctarget\u003e\u0027 rule (or the RPZ \u0027rpz-cname-override\u0027 equivalent), a remote client who controls any delegated domain can crash the daemon. The serve-expired-client-timeout callback runs a two-pass loop to chase the respip-generated CNAME alias; on the second pass it resets \u0027alias_rrset\u0027 but not \u0027partial_rep\u0027. Later, this inconsistency leads to a NULL pointer dereference and an eventual crash. A malicious actor can exploit the vulnerability by controlling any zone that replies with an A/AAAA record that falls inside the configured response-ip/rpz subnet. By delaying the answer when the previous record has expired, the vulnerable path of \u0027serve-expired-client-timeout\u0027 is taken leading to denial of service via the server crash.",
"id": "GHSA-9vcf-h83p-jghm",
"modified": "2026-07-22T15:31:25Z",
"published": "2026-07-22T15:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55717"
},
{
"type": "WEB",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55717.txt"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9VF8-XH83-H327
Vulnerability from github – Published: 2026-06-10 06:30 – Updated: 2026-06-30 03:36A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following versions: QTS 5.2.9.3492 build 20260507 and later QuTS hero h5.2.9.3499 build 20260514 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3459 build 20260409 and later
{
"affected": [],
"aliases": [
"CVE-2026-24716"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-10T04:17:16Z",
"severity": "MODERATE"
},
"details": "A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.9.3492 build 20260507 and later\nQuTS hero h5.2.9.3499 build 20260514 and later\nQuTS hero h5.3.4.3500 build 20260520 and later\nQuTS hero h6.0.0.3459 build 20260409 and later",
"id": "GHSA-9vf8-xh83-h327",
"modified": "2026-06-30T03:36:59Z",
"published": "2026-06-10T06:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24716"
},
{
"type": "WEB",
"url": "https://www.qnap.com/en/security-advisory/qsa-26-10"
},
{
"type": "WEB",
"url": "https://www.qnap.com/en/security-advisory/qsa-26-18"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-9VG9-8RQ6-7G37
Vulnerability from github – Published: 2026-08-25 18:31 – Updated: 2026-08-25 18:31NVIDIA DGX Spark contains a vulnerability in the system firmware, where a privileged attacker could be able to cause a NULL pointer dereference. A successful exploit of this vulnerability may lead to code execution, escalation of privileges, denial of service, information disclosure, and data tampering.
{
"affected": [],
"aliases": [
"CVE-2026-24263"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-25T17:17:10Z",
"severity": "HIGH"
},
"details": "NVIDIA DGX Spark contains a vulnerability in the system firmware, where a privileged attacker could be able to cause a NULL pointer dereference. A successful exploit of this vulnerability may lead to code execution, escalation of privileges, denial of service, information disclosure, and data tampering.",
"id": "GHSA-9vg9-8rq6-7g37",
"modified": "2026-08-25T18:31:56Z",
"published": "2026-08-25T18:31:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24263"
},
{
"type": "WEB",
"url": "https://github.com/NVIDIA/product-security/tree/main/2026/5867"
},
{
"type": "WEB",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-24263"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9VH7-C87X-8Q9V
Vulnerability from github – Published: 2023-12-11 21:30 – Updated: 2024-09-16 18:31A null pointer dereference vulnerability was found in dpll_pin_parent_pin_set() in drivers/dpll/dpll_netlink.c in the Digital Phase Locked Loop (DPLL) subsystem in the Linux kernel. This issue could be exploited to trigger a denial of service.
{
"affected": [],
"aliases": [
"CVE-2023-6679"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-12-11T19:15:09Z",
"severity": "MODERATE"
},
"details": "A null pointer dereference vulnerability was found in dpll_pin_parent_pin_set() in drivers/dpll/dpll_netlink.c in the Digital Phase Locked Loop (DPLL) subsystem in the Linux kernel. This issue could be exploited to trigger a denial of service.",
"id": "GHSA-9vh7-c87x-8q9v",
"modified": "2024-09-16T18:31:18Z",
"published": "2023-12-11T21:30:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6679"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:0439"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:0448"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:0461"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2023-6679"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2253986"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7LSPIOMIJYTLZB6QKPQVVAYSUETUWKPF"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LBVHM4LGMFIHBN4UBESYRFMYX3WUICV5"
},
{
"type": "WEB",
"url": "https://lore.kernel.org/netdev/20231211083758.1082853-1-jiri@resnulli.us"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9W2F-4F52-QCJ4
Vulnerability from github – Published: 2026-09-03 15:32 – Updated: 2026-09-03 15:32RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.
{
"affected": [],
"aliases": [
"CVE-2026-17539"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-03T13:04:35Z",
"severity": "MODERATE"
},
"details": "RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.",
"id": "GHSA-9w2f-4f52-qcj4",
"modified": "2026-09-03T15:32:10Z",
"published": "2026-09-03T15:32:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17539"
},
{
"type": "WEB",
"url": "https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9W3V-447Q-G6XG
Vulnerability from github – Published: 2024-10-11 18:32 – Updated: 2024-10-11 18:32A NULL Pointer Dereference vulnerability in the
packet forwarding engine (pfe) of Juniper Networks Junos OS on MX304, MX with MPC10/11/LC9600, and EX9200 with EX9200-15C allows a locally authenticated attacker with low privileges to cause a Denial of Service (DoS).
In a VPLS or Junos Fusion scenario, the execution of specific show commands will cause all FPCs hosting VPLS sessions or connecting to satellites to crash and restart.
This issue affects Junos on MX304, MX with MPC10/11/LC9600 and EX9200 with EX9200-15C:
- All version before 21.2R3-S1,
- 21.3 versions before 21.3R3,
- 21.4 versions before 21.4R2.
{
"affected": [],
"aliases": [
"CVE-2024-47501"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-10-11T16:15:11Z",
"severity": "MODERATE"
},
"details": "A NULL Pointer Dereference vulnerability in the \n\npacket forwarding engine (pfe)\u00a0of Juniper Networks Junos OS on MX304, MX with MPC10/11/LC9600, and\u00a0EX9200 with EX9200-15C allows a locally authenticated attacker with low privileges to cause a Denial of Service (DoS).\n\nIn a VPLS or Junos Fusion scenario, the execution of specific show commands will cause all FPCs hosting VPLS sessions or connecting to satellites to crash and restart.\n\nThis issue affects Junos on\u00a0MX304, MX with MPC10/11/LC9600 and EX9200 with EX9200-15C:\u00a0\n\n\n\n * All version before 21.2R3-S1,\n * 21.3 versions before 21.3R3,\u00a0\n * 21.4 versions before 21.4R2.",
"id": "GHSA-9w3v-447q-g6xg",
"modified": "2024-10-11T18:32:49Z",
"published": "2024-10-11T18:32:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47501"
},
{
"type": "WEB",
"url": "https://supportportal.juniper.net/JSA88131"
}
],
"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"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:X/RE:M/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-9W4M-FR9R-HH23
Vulnerability from github – Published: 2025-08-16 12:30 – Updated: 2026-01-07 21:31In the Linux kernel, the following vulnerability has been resolved:
drm/tegra: nvdec: Fix dma_alloc_coherent error check
Check for NULL return value with dma_alloc_coherent, in line with Robin's fix for vic.c in 'drm/tegra: vic: Fix DMA API misuse'.
{
"affected": [],
"aliases": [
"CVE-2025-38543"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-08-16T12:15:30Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/tegra: nvdec: Fix dma_alloc_coherent error check\n\nCheck for NULL return value with dma_alloc_coherent, in line with\nRobin\u0027s fix for vic.c in \u0027drm/tegra: vic: Fix DMA API misuse\u0027.",
"id": "GHSA-9w4m-fr9r-hh23",
"modified": "2026-01-07T21:31:38Z",
"published": "2025-08-16T12:30:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38543"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2e0812eedccd0629d73c9d0b1184a5db055df1da"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/44306a684cd1699b8562a54945ddc43e2abc9eab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/61b8d20962d00b7df117011c52f97cbb9c76a669"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a560de522374af931fa994d161db3667b0bb2545"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1240029f97ac8c06db4dd4407bbbf83e8d08570"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"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-9W66-P46H-J52F
Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-26 00:30In the Linux kernel, the following vulnerability has been resolved:
s390/mm: Do not map lowcore with identity mapping
Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once.
This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.
{
"affected": [],
"aliases": [
"CVE-2025-38733"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-05T18:15:42Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/mm: Do not map lowcore with identity mapping\n\nSince the identity mapping is pinned to address zero the lowcore is always\nalso mapped to address zero, this happens regardless of the relocate_lowcore\ncommand line option. If the option is specified the lowcore is mapped\ntwice, instead of only once.\n\nThis means that NULL pointer accesses will succeed instead of causing an\nexception (low address protection still applies, but covers only parts).\nTo fix this never map the first two pages of physical memory with the\nidentity mapping.",
"id": "GHSA-9w66-p46h-j52f",
"modified": "2025-11-26T00:30:16Z",
"published": "2025-09-05T18:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38733"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d7864acd497cb468a998d44631f84896f885e85"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/30bf5728bb217a6d1ba73f44094c9b9c6bc9a567"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/93f616ff870a1fb7e84d472cad0af651b18f9f87"
}
],
"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-9W76-GR65-HF28
Vulnerability from github – Published: 2022-05-17 00:22 – Updated: 2025-04-20 03:47In Watchdog Anti-Malware 2.74.186.150 and Online Security Pro 2.74.186.150, the zam32.sys driver contains a NULL pointer dereference vulnerability that gets triggered when sending an operation to ioctl 0x80002010. This is due to the input buffer being NULL or the input buffer size being 0 as they are not validated.
{
"affected": [],
"aliases": [
"CVE-2017-15921"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-10-30T15:29:00Z",
"severity": "HIGH"
},
"details": "In Watchdog Anti-Malware 2.74.186.150 and Online Security Pro 2.74.186.150, the zam32.sys driver contains a NULL pointer dereference vulnerability that gets triggered when sending an operation to ioctl 0x80002010. This is due to the input buffer being NULL or the input buffer size being 0 as they are not validated.",
"id": "GHSA-9w76-gr65-hf28",
"modified": "2025-04-20T03:47:50Z",
"published": "2022-05-17T00:22:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-15921"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/exploits/43058"
},
{
"type": "WEB",
"url": "http://packetstormsecurity.com/files/144786/Watchdog-Development-Anti-Malware-Online-Security-Pro-NULL-Pointer-Dereference.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9W8P-MP2M-7QP7
Vulnerability from github – Published: 2026-01-29 21:30 – Updated: 2026-02-03 18:30A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.
{
"affected": [],
"aliases": [
"CVE-2025-63655"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-01-29T20:16:08Z",
"severity": "HIGH"
},
"details": "A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.",
"id": "GHSA-9w8p-mp2m-7qp7",
"modified": "2026-02-03T18:30:31Z",
"published": "2026-01-29T21:30:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-63655"
},
{
"type": "WEB",
"url": "https://github.com/monkey/monkey/issues/427"
},
{
"type": "WEB",
"url": "https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2025.md"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-56
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
Select a programming language that is not susceptible to these issues.
Mitigation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
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
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.