CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6348 vulnerabilities reference this CWE, most recent first.
GHSA-9F9G-3975-X384
Vulnerability from github – Published: 2025-09-16 18:31 – Updated: 2025-12-02 00:31In the Linux kernel, the following vulnerability has been resolved:
ext4: fix null-ptr-deref in ext4_write_info
I caught a null-ptr-deref bug as follows:
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339 RIP: 0010:ext4_write_info+0x53/0x1b0 [...] Call Trace: dquot_writeback_dquots+0x341/0x9a0 ext4_sync_fs+0x19e/0x800 __sync_filesystem+0x83/0x100 sync_filesystem+0x89/0xf0 generic_shutdown_super+0x79/0x3e0 kill_block_super+0xa1/0x110 deactivate_locked_super+0xac/0x130 deactivate_super+0xb6/0xd0 cleanup_mnt+0x289/0x400 __cleanup_mnt+0x16/0x20 task_work_run+0x11c/0x1c0 exit_to_user_mode_prepare+0x203/0x210 syscall_exit_to_user_mode+0x5b/0x3a0 do_syscall_64+0x59/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ==================================================================
Above issue may happen as follows:
exit_to_user_mode_prepare task_work_run __cleanup_mnt cleanup_mnt deactivate_super deactivate_locked_super kill_block_super generic_shutdown_super shrink_dcache_for_umount dentry = sb->s_root sb->s_root = NULL <--- Here set NULL sync_filesystem __sync_filesystem sb->s_op->sync_fs > ext4_sync_fs dquot_writeback_dquots sb->dq_op->write_info > ext4_write_info ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2) d_inode(sb->s_root) s_root->d_inode <--- Null pointer dereference
To solve this problem, we use ext4_journal_start_sb directly to avoid s_root being used.
{
"affected": [],
"aliases": [
"CVE-2022-50344"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-16T17:15:34Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix null-ptr-deref in ext4_write_info\n\nI caught a null-ptr-deref bug as follows:\n==================================================================\nKASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\nCPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339\nRIP: 0010:ext4_write_info+0x53/0x1b0\n[...]\nCall Trace:\n dquot_writeback_dquots+0x341/0x9a0\n ext4_sync_fs+0x19e/0x800\n __sync_filesystem+0x83/0x100\n sync_filesystem+0x89/0xf0\n generic_shutdown_super+0x79/0x3e0\n kill_block_super+0xa1/0x110\n deactivate_locked_super+0xac/0x130\n deactivate_super+0xb6/0xd0\n cleanup_mnt+0x289/0x400\n __cleanup_mnt+0x16/0x20\n task_work_run+0x11c/0x1c0\n exit_to_user_mode_prepare+0x203/0x210\n syscall_exit_to_user_mode+0x5b/0x3a0\n do_syscall_64+0x59/0x70\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n ==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\nexit_to_user_mode_prepare\n task_work_run\n __cleanup_mnt\n cleanup_mnt\n deactivate_super\n deactivate_locked_super\n kill_block_super\n generic_shutdown_super\n shrink_dcache_for_umount\n dentry = sb-\u003es_root\n sb-\u003es_root = NULL \u003c--- Here set NULL\n sync_filesystem\n __sync_filesystem\n sb-\u003es_op-\u003esync_fs \u003e ext4_sync_fs\n dquot_writeback_dquots\n sb-\u003edq_op-\u003ewrite_info \u003e ext4_write_info\n ext4_journal_start(d_inode(sb-\u003es_root), EXT4_HT_QUOTA, 2)\n d_inode(sb-\u003es_root)\n s_root-\u003ed_inode \u003c--- Null pointer dereference\n\nTo solve this problem, we use ext4_journal_start_sb directly\nto avoid s_root being used.",
"id": "GHSA-9f9g-3975-x384",
"modified": "2025-12-02T00:31:10Z",
"published": "2025-09-16T18:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50344"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3638aa1c7d87c0ca0aef23cf58cae2c48e7daca4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4a657319cfabd6199fd0b7b65bbebf6ded7a11c1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/533c60a0b97cee5daab376933f486207e6680fb7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/947264e00c46de19a016fd81218118c708fed2f3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bb420e8afc854d2a1caaa23a0c129839acfb7888"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc451578446afd03c0c21913993c08898a691435"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f34ab95162763cd7352f46df169296eec28b688d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f4b5ff0b794aa94afac7269c494550ca2f66511b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9c1f248607d5546075d3f731e7607d5571f2b60"
}
],
"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-9FH5-955W-9JFH
Vulnerability from github – Published: 2024-01-29 18:31 – Updated: 2024-06-10 18:30A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.
{
"affected": [],
"aliases": [
"CVE-2023-40546"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-29T17:15:08Z",
"severity": "MODERATE"
},
"details": "A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn\u0027t match the format string used by it, leading to a crash under certain circumstances.",
"id": "GHSA-9fh5-955w-9jfh",
"modified": "2024-06-10T18:30:52Z",
"published": "2024-01-29T18:31:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-40546"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1834"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1835"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1873"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1876"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1883"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1902"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1903"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:1959"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2024:2086"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2023-40546"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2241796"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9FHM-W5M6-RQV5
Vulnerability from github – Published: 2025-01-11 15:30 – Updated: 2026-07-14 15:31In the Linux kernel, the following vulnerability has been resolved:
dlm: fix possible lkb_resource null dereference
This patch fixes a possible null pointer dereference when this function is called from request_lock() as lkb->lkb_resource is not assigned yet, only after validate_lock_args() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded.
The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled. The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference.
In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.
{
"affected": [],
"aliases": [
"CVE-2024-47809"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-11T13:15:22Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: fix possible lkb_resource null dereference\n\nThis patch fixes a possible null pointer dereference when this function is\ncalled from request_lock() as lkb-\u003elkb_resource is not assigned yet,\nonly after validate_lock_args() by calling attach_lkb(). Another issue\nis that a resource name could be a non printable bytearray and we cannot\nassume to be ASCII coded.\n\nThe log functionality is probably never being hit when DLM is used in\nnormal way and no debug logging is enabled. The null pointer dereference\ncan only occur on a new created lkb that does not have the resource\nassigned yet, it probably never hits the null pointer dereference but we\nshould be sure that other changes might not change this behaviour and we\nactually can hit the mentioned null pointer dereference.\n\nIn this patch we just drop the printout of the resource name, the lkb id\nis enough to make a possible connection to a resource name if this\nexists.",
"id": "GHSA-9fhm-w5m6-rqv5",
"modified": "2026-07-14T15:31:16Z",
"published": "2025-01-11T15:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47809"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8d55ce46dd543c6965970ce70c22c3076dd35b1e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e1ffea6bec96d4349dbfcc42ad3e436259f64243"
}
],
"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-9FM4-J993-VWRJ
Vulnerability from github – Published: 2024-11-09 12:30 – Updated: 2024-11-14 18:30In the Linux kernel, the following vulnerability has been resolved:
phy: qcom: qmp-usbc: fix NULL-deref on runtime suspend
Commit 413db06c05e7 ("phy: qcom-qmp-usb: clean up probe initialisation") removed most users of the platform device driver data from the qcom-qmp-usb driver, but mistakenly also removed the initialisation despite the data still being used in the runtime PM callbacks. This bug was later reproduced when the driver was copied to create the qmp-usbc driver.
Restore the driver data initialisation at probe to avoid a NULL-pointer dereference on runtime suspend.
Apparently no one uses runtime PM, which currently needs to be enabled manually through sysfs, with these drivers.
{
"affected": [],
"aliases": [
"CVE-2024-50238"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-11-09T11:15:09Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: qcom: qmp-usbc: fix NULL-deref on runtime suspend\n\nCommit 413db06c05e7 (\"phy: qcom-qmp-usb: clean up probe initialisation\")\nremoved most users of the platform device driver data from the\nqcom-qmp-usb driver, but mistakenly also removed the initialisation\ndespite the data still being used in the runtime PM callbacks. This bug\nwas later reproduced when the driver was copied to create the qmp-usbc\ndriver.\n\nRestore the driver data initialisation at probe to avoid a NULL-pointer\ndereference on runtime suspend.\n\nApparently no one uses runtime PM, which currently needs to be enabled\nmanually through sysfs, with these drivers.",
"id": "GHSA-9fm4-j993-vwrj",
"modified": "2024-11-14T18:30:32Z",
"published": "2024-11-09T12:30:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50238"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/34c21f94fa1e147a19b54b6adf0c93a623b70dd8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c7086dc0539b1b2b61c8c735186698bca4858246"
}
],
"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-9FPW-7F22-7CM4
Vulnerability from github – Published: 2022-05-24 19:21 – Updated: 2022-05-24 19:21Adobe Prelude version 10.1 (and earlier) is affected by a null pointer dereference vulnerability when parsing a specially crafted file. An unauthenticated attacker could leverage this vulnerability to achieve an application denial-of-service in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
{
"affected": [],
"aliases": [
"CVE-2021-40773"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-11-22T16:15:00Z",
"severity": "MODERATE"
},
"details": "Adobe Prelude version 10.1 (and earlier) is affected by a null pointer dereference vulnerability when parsing a specially crafted file. An unauthenticated attacker could leverage this vulnerability to achieve an application denial-of-service in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.",
"id": "GHSA-9fpw-7f22-7cm4",
"modified": "2022-05-24T19:21:11Z",
"published": "2022-05-24T19:21:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40773"
},
{
"type": "WEB",
"url": "https://helpx.adobe.com/security/products/prelude/apsb21-96.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-9FRR-F75V-8934
Vulnerability from github – Published: 2022-05-24 16:58 – Updated: 2024-04-04 02:20Bento4 1.5.1.0 has a NULL pointer dereference in AP4_DescriptorListInspector::Action in Core/Ap4Descriptor.h, related to AP4_IodsAtom::InspectFields in Core/Ap4IodsAtom.cpp, as demonstrated by mp4dump.
{
"affected": [],
"aliases": [
"CVE-2019-17452"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-10-10T17:15:00Z",
"severity": "MODERATE"
},
"details": "Bento4 1.5.1.0 has a NULL pointer dereference in AP4_DescriptorListInspector::Action in Core/Ap4Descriptor.h, related to AP4_IodsAtom::InspectFields in Core/Ap4IodsAtom.cpp, as demonstrated by mp4dump.",
"id": "GHSA-9frr-f75v-8934",
"modified": "2024-04-04T02:20:25Z",
"published": "2022-05-24T16:58:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-17452"
},
{
"type": "WEB",
"url": "https://github.com/axiomatic-systems/Bento4/issues/434"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9FV5-GJQQ-RC4H
Vulnerability from github – Published: 2022-05-24 19:11 – Updated: 2022-05-24 19:11NVIDIA Linux kernel distributions contain a vulnerability in nvmap, where a null pointer dereference may lead to complete denial of service.
{
"affected": [],
"aliases": [
"CVE-2021-1112"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-08-11T22:15:00Z",
"severity": "MODERATE"
},
"details": "NVIDIA Linux kernel distributions contain a vulnerability in nvmap, where a null pointer dereference may lead to complete denial of service.",
"id": "GHSA-9fv5-gjqq-rc4h",
"modified": "2022-05-24T19:11:02Z",
"published": "2022-05-24T19:11:02Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1112"
},
{
"type": "WEB",
"url": "https://nvidia.custhelp.com/app/answers/detail/a_id/5216"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-9FX5-WC5Q-367P
Vulnerability from github – Published: 2022-05-13 01:27 – Updated: 2022-05-13 01:27qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.
{
"affected": [],
"aliases": [
"CVE-2018-13458"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-07-12T18:29:00Z",
"severity": "MODERATE"
},
"details": "qh_core in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.",
"id": "GHSA-9fx5-wc5q-367p",
"modified": "2022-05-13T01:27:25Z",
"published": "2022-05-13T01:27:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-13458"
},
{
"type": "WEB",
"url": "https://gist.github.com/fakhrizulkifli/40f3daf52950cca6de28ebec2498ff6e"
},
{
"type": "WEB",
"url": "https://knowledge.opsview.com/v5.3/docs/whats-new"
},
{
"type": "WEB",
"url": "https://knowledge.opsview.com/v5.4/docs/whats-new"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/exploits/45082"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00014.html"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00022.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-9FX9-J289-P7F2
Vulnerability from github – Published: 2024-02-27 09:31 – Updated: 2024-04-10 15:30In the Linux kernel, the following vulnerability has been resolved:
ixgbe: Fix NULL pointer dereference in ethtool loopback test
The ixgbe driver currently generates a NULL pointer dereference when performing the ethtool loopback test. This is due to the fact that there isn't a q_vector associated with the test ring when it is setup as interrupts are not normally added to the test rings.
To address this I have added code that will check for a q_vector before returning a napi_id value. If a q_vector is not present it will return a value of 0.
{
"affected": [],
"aliases": [
"CVE-2021-46916"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T07:15:08Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nixgbe: Fix NULL pointer dereference in ethtool loopback test\n\nThe ixgbe driver currently generates a NULL pointer dereference when\nperforming the ethtool loopback test. This is due to the fact that there\nisn\u0027t a q_vector associated with the test ring when it is setup as\ninterrupts are not normally added to the test rings.\n\nTo address this I have added code that will check for a q_vector before\nreturning a napi_id value. If a q_vector is not present it will return a\nvalue of 0.",
"id": "GHSA-9fx9-j289-p7f2",
"modified": "2024-04-10T15:30:31Z",
"published": "2024-02-27T09:31:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46916"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/31166efb1cee348eb6314e9c0095d84cbeb66b9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/758d19098df4b0bbca9f40d6ae6c82c9c18b9bba"
}
],
"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-9G28-83M6-MVG3
Vulnerability from github – Published: 2026-06-15 21:30 – Updated: 2026-06-16 15:33A NULL pointer dereference occurs in Roy Marples NetworkConfiguration/dhcpcd 10.3.0 while parsing configuration options. In parse_option() (src/if-options.c:1886), the code performs a member access on a NULL pointer of type 'struct dhcp_opt' when an unexpected/invalid option token or parsing state causes the lookup to yield NULL. The instrumented fuzzing build reports 'runtime error: member access within null pointer of type struct dhcp_opt' and aborts.
{
"affected": [],
"aliases": [
"CVE-2025-70102"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-15T20:16:24Z",
"severity": "MODERATE"
},
"details": "A NULL pointer dereference occurs in Roy Marples NetworkConfiguration/dhcpcd 10.3.0 while parsing configuration options. In parse_option() (src/if-options.c:1886), the code performs a member access on a NULL pointer of type \u0027struct dhcp_opt\u0027 when an unexpected/invalid option token or parsing state causes the lookup to yield NULL. The instrumented fuzzing build reports \u0027runtime error: member access within null pointer of type struct dhcp_opt\u0027 and aborts.",
"id": "GHSA-9g28-83m6-mvg3",
"modified": "2026-06-16T15:33:44Z",
"published": "2026-06-15T21:30:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-70102"
},
{
"type": "WEB",
"url": "https://infosec.exchange/@sigdevel/116733594508542047"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"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.