CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6325 vulnerabilities reference this CWE, most recent first.
GHSA-3FGW-X27J-XM6W
Vulnerability from github – Published: 2024-02-27 21:31 – Updated: 2024-04-10 21:30In the Linux kernel, the following vulnerability has been resolved:
sfc: farch: fix TX queue lookup in TX flush done handling
We're starting from a TXQ instance number ('qid'), not a TXQ type, so efx_get_tx_queue() is inappropriate (and could return NULL, leading to panics).
{
"affected": [],
"aliases": [
"CVE-2021-46949"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T19:04:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: farch: fix TX queue lookup in TX flush done handling\n\nWe\u0027re starting from a TXQ instance number (\u0027qid\u0027), not a TXQ type, so\n efx_get_tx_queue() is inappropriate (and could return NULL, leading\n to panics).",
"id": "GHSA-3fgw-x27j-xm6w",
"modified": "2024-04-10T21:30:29Z",
"published": "2024-02-27T21:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46949"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5b1faa92289b53cad654123ed2bc8e10f6ddd4ac"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98d91180748986bfb6dfb3e72765f3225719a647"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a1570985ec04116cc665b760faf666a104154170"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fb791572d6747ef385f628450f8d57cd132e6e5a"
}
],
"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-3FQ7-8GQG-M2M9
Vulnerability from github – Published: 2022-05-24 16:56 – Updated: 2024-04-04 01:55An exploitable denial-of-service vulnerability exists in the session handling functionality of the NETGEAR N300 (WNR2000v5 with Firmware Version V1.0.0.70) HTTP server. An HTTP request with an empty User-Agent string sent to a page requiring authentication can cause a null pointer dereference, resulting in the HTTP service crashing. An unauthenticated attacker can send a specially crafted HTTP request to trigger this vulnerability.
{
"affected": [],
"aliases": [
"CVE-2019-5054"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-09-11T22:15:00Z",
"severity": "HIGH"
},
"details": "An exploitable denial-of-service vulnerability exists in the session handling functionality of the NETGEAR N300 (WNR2000v5 with Firmware Version V1.0.0.70) HTTP server. An HTTP request with an empty User-Agent string sent to a page requiring authentication can cause a null pointer dereference, resulting in the HTTP service crashing. An unauthenticated attacker can send a specially crafted HTTP request to trigger this vulnerability.",
"id": "GHSA-3fq7-8gqg-m2m9",
"modified": "2024-04-04T01:55:50Z",
"published": "2022-05-24T16:56:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-5054"
},
{
"type": "WEB",
"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2019-0831"
}
],
"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"
}
]
}
GHSA-3FQC-QHH2-FXHG
Vulnerability from github – Published: 2022-06-29 00:00 – Updated: 2022-07-08 00:00In GPAC MP4Box 1.1.0, there is a Null pointer reference in the function gf_filter_pid_get_packet function in src/filter_core/filter_pid.c:5394, as demonstrated by GPAC. This can cause a denial of service (DOS).
{
"affected": [],
"aliases": [
"CVE-2021-40944"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-06-28T13:15:00Z",
"severity": "MODERATE"
},
"details": "In GPAC MP4Box 1.1.0, there is a Null pointer reference in the function gf_filter_pid_get_packet function in src/filter_core/filter_pid.c:5394, as demonstrated by GPAC. This can cause a denial of service (DOS).",
"id": "GHSA-3fqc-qhh2-fxhg",
"modified": "2022-07-08T00:00:45Z",
"published": "2022-06-29T00:00:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40944"
},
{
"type": "WEB",
"url": "https://github.com/gpac/gpac/issues/1906"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2023/dsa-5411"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-3FQC-V7HH-4M8X
Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-07-14 15:31In the Linux kernel, the following vulnerability has been resolved:
libceph: return the handler error from mon_handle_auth_done()
Currently any error from ceph_auth_handle_reply_done() is propagated via finish_auth() but isn't returned from mon_handle_auth_done(). This results in higher layers learning that (despite the monitor considering us to be successfully authenticated) something went wrong in the authentication phase and reacting accordingly, but msgr2 still trying to proceed with establishing the session in the background. In the case of secure mode this can trigger a WARN in setup_crypto() and later lead to a NULL pointer dereference inside of prepare_auth_signature().
{
"affected": [],
"aliases": [
"CVE-2026-22992"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-01-23T16:15:55Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: return the handler error from mon_handle_auth_done()\n\nCurrently any error from ceph_auth_handle_reply_done() is propagated\nvia finish_auth() but isn\u0027t returned from mon_handle_auth_done(). This\nresults in higher layers learning that (despite the monitor considering\nus to be successfully authenticated) something went wrong in the\nauthentication phase and reacting accordingly, but msgr2 still trying\nto proceed with establishing the session in the background. In the\ncase of secure mode this can trigger a WARN in setup_crypto() and later\nlead to a NULL pointer dereference inside of prepare_auth_signature().",
"id": "GHSA-3fqc-v7hh-4m8x",
"modified": "2026-07-14T15:31:33Z",
"published": "2026-01-23T18:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22992"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/33908769248b38a5e77cf9292817bb28e641992d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/77229551f2cf72f3e35636db68e6a825b912cf16"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9e0101e57534ef0e7578dd09608a6106736b82e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d2c4a5f6996683f287f3851ef5412797042de7f1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e097cd858196b1914309e7e3d79b4fa79383754d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e84b48d31b5008932c0a0902982809fbaa1d3b70"
}
],
"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-3FV7-F54H-J866
Vulnerability from github – Published: 2024-03-06 09:30 – Updated: 2025-02-14 18:30In the Linux kernel, the following vulnerability has been resolved:
pds_core: Prevent race issues involving the adminq
There are multiple paths that can result in using the pdsc's adminq.
[1] pdsc_adminq_isr and the resulting work from queue_work(), i.e. pdsc_work_thread()->pdsc_process_adminq()
[2] pdsc_adminq_post()
When the device goes through reset via PCIe reset and/or a fw_down/fw_up cycle due to bad PCIe state or bad device state the adminq is destroyed and recreated.
A NULL pointer dereference can happen if [1] or [2] happens after the adminq is already destroyed.
In order to fix this, add some further state checks and implement reference counting for adminq uses. Reference counting was used because multiple threads can attempt to access the adminq at the same time via [1] or [2]. Additionally, multiple clients (i.e. pds-vfio-pci) can be using [2] at the same time.
The adminq_refcnt is initialized to 1 when the adminq has been allocated and is ready to use. Users/clients of the adminq (i.e. [1] and [2]) will increment the refcnt when they are using the adminq. When the driver goes into a fw_down cycle it will set the PDSC_S_FW_DEAD bit and then wait for the adminq_refcnt to hit 1. Setting the PDSC_S_FW_DEAD before waiting will prevent any further adminq_refcnt increments. Waiting for the adminq_refcnt to hit 1 allows for any current users of the adminq to finish before the driver frees the adminq. Once the adminq_refcnt hits 1 the driver clears the refcnt to signify that the adminq is deleted and cannot be used. On the fw_up cycle the driver will once again initialize the adminq_refcnt to 1 allowing the adminq to be used again.
{
"affected": [],
"aliases": [
"CVE-2024-26623"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-06T07:15:12Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: Prevent race issues involving the adminq\n\nThere are multiple paths that can result in using the pdsc\u0027s\nadminq.\n\n[1] pdsc_adminq_isr and the resulting work from queue_work(),\n i.e. pdsc_work_thread()-\u003epdsc_process_adminq()\n\n[2] pdsc_adminq_post()\n\nWhen the device goes through reset via PCIe reset and/or\na fw_down/fw_up cycle due to bad PCIe state or bad device\nstate the adminq is destroyed and recreated.\n\nA NULL pointer dereference can happen if [1] or [2] happens\nafter the adminq is already destroyed.\n\nIn order to fix this, add some further state checks and\nimplement reference counting for adminq uses. Reference\ncounting was used because multiple threads can attempt to\naccess the adminq at the same time via [1] or [2]. Additionally,\nmultiple clients (i.e. pds-vfio-pci) can be using [2]\nat the same time.\n\nThe adminq_refcnt is initialized to 1 when the adminq has been\nallocated and is ready to use. Users/clients of the adminq\n(i.e. [1] and [2]) will increment the refcnt when they are using\nthe adminq. When the driver goes into a fw_down cycle it will\nset the PDSC_S_FW_DEAD bit and then wait for the adminq_refcnt\nto hit 1. Setting the PDSC_S_FW_DEAD before waiting will prevent\nany further adminq_refcnt increments. Waiting for the\nadminq_refcnt to hit 1 allows for any current users of the adminq\nto finish before the driver frees the adminq. Once the\nadminq_refcnt hits 1 the driver clears the refcnt to signify that\nthe adminq is deleted and cannot be used. On the fw_up cycle the\ndriver will once again initialize the adminq_refcnt to 1 allowing\nthe adminq to be used again.",
"id": "GHSA-3fv7-f54h-j866",
"modified": "2025-02-14T18:30:45Z",
"published": "2024-03-06T09:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26623"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/22cd6046eb2148b18990257505834dd45c672a1b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5939feb63ea1f011027576c64b68b681cbad31ca"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7e82a8745b951b1e794cc780d46f3fbee5e93447"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-3FVF-WXCF-7V9Q
Vulnerability from github – Published: 2022-05-24 19:15 – Updated: 2022-05-24 19:15An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c. It allows an attacker to cause Denial of Service.
{
"affected": [],
"aliases": [
"CVE-2021-39521"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-09-20T16:15:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c. It allows an attacker to cause Denial of Service.",
"id": "GHSA-3fvf-wxcf-7v9q",
"modified": "2022-05-24T19:15:10Z",
"published": "2022-05-24T19:15:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-39521"
},
{
"type": "WEB",
"url": "https://github.com/LibreDWG/libredwg/issues/262"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-3FXP-M3GR-PFVM
Vulnerability from github – Published: 2022-05-13 01:16 – Updated: 2022-05-13 01:16A NULL pointer dereference flaw was found in the way openjpeg 2.1.2 decoded certain input images. Due to a logic error in the code responsible for decoding the input image, an application using openjpeg to process image data could crash when processing a crafted image.
{
"affected": [],
"aliases": [
"CVE-2016-9572"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-08-01T16:29:00Z",
"severity": "MODERATE"
},
"details": "A NULL pointer dereference flaw was found in the way openjpeg 2.1.2 decoded certain input images. Due to a logic error in the code responsible for decoding the input image, an application using openjpeg to process image data could crash when processing a crafted image.",
"id": "GHSA-3fxp-m3gr-pfvm",
"modified": "2022-05-13T01:16:23Z",
"published": "2022-05-13T01:16:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2016-9572"
},
{
"type": "WEB",
"url": "https://github.com/uclouvain/openjpeg/issues/863"
},
{
"type": "WEB",
"url": "https://github.com/szukw000/openjpeg/commit/7b28bd2b723df6be09fe7791eba33147c1c47d0d"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9572"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/201710-26"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2017/dsa-3768"
},
{
"type": "WEB",
"url": "https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/109233"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-3G53-3CMJ-QJRH
Vulnerability from github – Published: 2025-10-01 12:30 – Updated: 2026-01-20 18:31In the Linux kernel, the following vulnerability has been resolved:
pwm: lpc32xx: Remove handling of PWM channels
Because LPC32xx PWM controllers have only a single output which is registered as the only PWM device/channel per controller, it is known in advance that pwm->hwpwm value is always 0. On basis of this fact simplify the code by removing operations with pwm->hwpwm, there is no controls which require channel number as input.
Even though I wasn't aware at the time when I forward ported that patch, this fixes a null pointer dereference as lpc32xx->chip.pwms is NULL before devm_pwmchip_add() is called.
{
"affected": [],
"aliases": [
"CVE-2023-53472"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T12:15:49Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\npwm: lpc32xx: Remove handling of PWM channels\n\nBecause LPC32xx PWM controllers have only a single output which is\nregistered as the only PWM device/channel per controller, it is known in\nadvance that pwm-\u003ehwpwm value is always 0. On basis of this fact\nsimplify the code by removing operations with pwm-\u003ehwpwm, there is no\ncontrols which require channel number as input.\n\nEven though I wasn\u0027t aware at the time when I forward ported that patch,\nthis fixes a null pointer dereference as lpc32xx-\u003echip.pwms is NULL\nbefore devm_pwmchip_add() is called.",
"id": "GHSA-3g53-3cmj-qjrh",
"modified": "2026-01-20T18:31:51Z",
"published": "2025-10-01T12:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53472"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/04301da4d87067a989f70ee56942bf9d97cd2a45"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4aae44f65827f0213a7361cf9c32cfe06114473f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/523f6268e86552a048975749251184c4e9a4b38f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5e22217c11424ef958ba28d03ff7167b4d7a8914"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a2d9d884e84bfd37892219b1f55847f36d8e9901"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9a505f5b39d8fff1a55963a5e524c84639e98b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abd9b2ee4047ccd980decbf26d61f9637604b1d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e3a0ddbaf7f1f9ffc070718b417461ced3268758"
}
],
"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-3G6H-HMJ4-8J2M
Vulnerability from github – Published: 2023-04-13 09:30 – Updated: 2024-04-04 03:26Transient DOS in Modem due to null pointer dereference while processing the incoming packet with http chunked encoding.
{
"affected": [],
"aliases": [
"CVE-2022-33223"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-04-13T07:15:00Z",
"severity": "HIGH"
},
"details": "Transient DOS in Modem due to null pointer dereference while processing the incoming packet with http chunked encoding.",
"id": "GHSA-3g6h-hmj4-8j2m",
"modified": "2024-04-04T03:26:46Z",
"published": "2023-04-13T09:30:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-33223"
},
{
"type": "WEB",
"url": "https://www.qualcomm.com/company/product-security/bulletins/april-2023-bulletin"
}
],
"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"
}
]
}
GHSA-3G6Q-J56Q-QW54
Vulnerability from github – Published: 2025-05-08 09:30 – Updated: 2025-06-05 15:31In the Linux kernel, the following vulnerability has been resolved:
driver core: fix potential NULL pointer dereference in dev_uevent()
If userspace reads "uevent" device attribute at the same time as another threads unbinds the device from its driver, change to dev->driver from a valid pointer to NULL may result in crash. Fix this by using READ_ONCE() when fetching the pointer, and take bus' drivers klist lock to make sure driver instance will not disappear while we access it.
Use WRITE_ONCE() when setting the driver pointer to ensure there is no tearing.
{
"affected": [],
"aliases": [
"CVE-2025-37800"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-08T07:15:50Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential NULL pointer dereference in dev_uevent()\n\nIf userspace reads \"uevent\" device attribute at the same time as another\nthreads unbinds the device from its driver, change to dev-\u003edriver from a\nvalid pointer to NULL may result in crash. Fix this by using READ_ONCE()\nwhen fetching the pointer, and take bus\u0027 drivers klist lock to make sure\ndriver instance will not disappear while we access it.\n\nUse WRITE_ONCE() when setting the driver pointer to ensure there is no\ntearing.",
"id": "GHSA-3g6q-j56q-qw54",
"modified": "2025-06-05T15:31:22Z",
"published": "2025-05-08T09:30:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37800"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18daa52418e7e4629ed1703b64777294209d2622"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b344e779d9afd0fcb5ee4000e4d0fc7d8d867eb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3781e4b83e174364998855de777e184cf0b62c40"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abe56be73eb10a677d16066f65ff9d30251f5eee"
}
],
"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"
}
]
}
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.