CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6310 vulnerabilities reference this CWE, most recent first.
GHSA-MHC4-95PW-JJV5
Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-09-22 21:30In the Linux kernel, the following vulnerability has been resolved:
cifs: prevent bad output lengths in smb2_ioctl_query_info()
When calling smb2_ioctl_query_info() with smb_query_info::flags=PASSTHRU_FSCTL and smb_query_info::output_buffer_length=0, the following would return 0x10
buffer = memdup_user(arg + sizeof(struct smb_query_info),
qi.output_buffer_length);
if (IS_ERR(buffer)) {
kfree(vars);
return PTR_ERR(buffer);
}
rather than a valid pointer thus making IS_ERR() check fail. This would then cause a NULL ptr deference in @buffer when accessing it later in smb2_ioctl_query_ioctl(). While at it, prevent having a @buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO FileEndOfFileInformation requests when smb_query_info::flags=PASSTHRU_SET_INFO.
Here is a small C reproducer which triggers a NULL ptr in @buffer when passing an invalid smb_query_info::flags
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#define die(s) perror(s), exit(1)
#define QUERY_INFO 0xc018cf07
int main(int argc, char *argv[])
{
int fd;
if (argc < 2)
exit(1);
fd = open(argv[1], O_RDONLY);
if (fd == -1)
die("open");
if (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)
die("ioctl");
close(fd);
return 0;
}
mount.cifs //srv/share /mnt -o ...
gcc repro.c && ./a.out /mnt/f0
[ 114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
[ 114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
[ 114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1
[ 114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014
[ 114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]
[ 114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24
[ 114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256
[ 114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d
[ 114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380
[ 114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003
[ 114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288
[ 114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000
[ 114.144852] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000
[ 114.145338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0
[ 114.146131] Call Trace:
[ 114.146291] <TASK>
[ 114.146432] ? smb2_query_reparse_tag+0x890/0x890 [cifs]
[ 114.146800] ? cifs_mapchar+0x460/0x460 [cifs]
[ 114.147121] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.147412] ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]
[ 114.147775] ? dentry_path_raw+0xa6/0xf0
[ 114.148024] ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]
[ 114.148413] ? smb2_check_message+0x1080/0x1080 [cifs]
[ 114.148766] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.149065] cifs_ioctl+0x1577/0x3320 [cifs]
[ 114.149371] ? lock_downgrade+0x6f0/0x6f0
[ 114.149631] ? cifs_readdir+0x2e60/0x2e60 [cifs]
[ 114.149956] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.150250] ? __rseq_handle_notify_resume+0x80b/0xbe0
[ 114.150562] ? __up_read+0x192/0x710
[ 114.150791] ? __ia32_sys_rseq+0xf0/0xf0
[ 114.151025] ? __x64_sys_openat+0x11f/0x1d0
[ 114.151296] __x64_sys_ioctl+0x127/0x190
[ 114.151549] do_syscall_64+0x3b/0x90
[ 114.151768] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 114.152079] RIP: 0033:0x7f7aead043df
[ 114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24
---truncated---
{
"affected": [],
"aliases": [
"CVE-2022-49271"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:04Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: prevent bad output lengths in smb2_ioctl_query_info()\n\nWhen calling smb2_ioctl_query_info() with\nsmb_query_info::flags=PASSTHRU_FSCTL and\nsmb_query_info::output_buffer_length=0, the following would return\n0x10\n\n\tbuffer = memdup_user(arg + sizeof(struct smb_query_info),\n\t\t\t qi.output_buffer_length);\n\tif (IS_ERR(buffer)) {\n\t\tkfree(vars);\n\t\treturn PTR_ERR(buffer);\n\t}\n\nrather than a valid pointer thus making IS_ERR() check fail. This\nwould then cause a NULL ptr deference in @buffer when accessing it\nlater in smb2_ioctl_query_ioctl(). While at it, prevent having a\n@buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO\nFileEndOfFileInformation requests when\nsmb_query_info::flags=PASSTHRU_SET_INFO.\n\nHere is a small C reproducer which triggers a NULL ptr in @buffer when\npassing an invalid smb_query_info::flags\n\n\t#include \u003cstdio.h\u003e\n\t#include \u003cstdlib.h\u003e\n\t#include \u003cstdint.h\u003e\n\t#include \u003cunistd.h\u003e\n\t#include \u003cfcntl.h\u003e\n\t#include \u003csys/ioctl.h\u003e\n\n\t#define die(s) perror(s), exit(1)\n\t#define QUERY_INFO 0xc018cf07\n\n\tint main(int argc, char *argv[])\n\t{\n\t\tint fd;\n\n\t\tif (argc \u003c 2)\n\t\t\texit(1);\n\t\tfd = open(argv[1], O_RDONLY);\n\t\tif (fd == -1)\n\t\t\tdie(\"open\");\n\t\tif (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)\n\t\t\tdie(\"ioctl\");\n\t\tclose(fd);\n\t\treturn 0;\n\t}\n\n\tmount.cifs //srv/share /mnt -o ...\n\tgcc repro.c \u0026\u0026 ./a.out /mnt/f0\n\n\t[ 114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI\n\t[ 114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n\t[ 114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1\n\t[ 114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n\t[ 114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]\n\t[ 114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 \u003c80\u003e 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24\n\t[ 114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256\n\t[ 114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d\n\t[ 114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380\n\t[ 114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003\n\t[ 114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288\n\t[ 114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000\n\t[ 114.144852] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000\n\t[ 114.145338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\t[ 114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0\n\t[ 114.146131] Call Trace:\n\t[ 114.146291] \u003cTASK\u003e\n\t[ 114.146432] ? smb2_query_reparse_tag+0x890/0x890 [cifs]\n\t[ 114.146800] ? cifs_mapchar+0x460/0x460 [cifs]\n\t[ 114.147121] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.147412] ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]\n\t[ 114.147775] ? dentry_path_raw+0xa6/0xf0\n\t[ 114.148024] ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]\n\t[ 114.148413] ? smb2_check_message+0x1080/0x1080 [cifs]\n\t[ 114.148766] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.149065] cifs_ioctl+0x1577/0x3320 [cifs]\n\t[ 114.149371] ? lock_downgrade+0x6f0/0x6f0\n\t[ 114.149631] ? cifs_readdir+0x2e60/0x2e60 [cifs]\n\t[ 114.149956] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.150250] ? __rseq_handle_notify_resume+0x80b/0xbe0\n\t[ 114.150562] ? __up_read+0x192/0x710\n\t[ 114.150791] ? __ia32_sys_rseq+0xf0/0xf0\n\t[ 114.151025] ? __x64_sys_openat+0x11f/0x1d0\n\t[ 114.151296] __x64_sys_ioctl+0x127/0x190\n\t[ 114.151549] do_syscall_64+0x3b/0x90\n\t[ 114.151768] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\t[ 114.152079] RIP: 0033:0x7f7aead043df\n\t[ 114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24\n---truncated---",
"id": "GHSA-mhc4-95pw-jjv5",
"modified": "2025-09-22T21:30:16Z",
"published": "2025-09-22T21:30:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49271"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7529fbee10d82493c5cb109e51788bf74816d1c0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9963ccea6087268e1275b992dca5d0dd4b938765"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b92e358757b91c2827af112cae9af513f26a3f34"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f143f8334fb9eb2f6c7c15b9da1472d9c965fd84"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fadddfc1dc3c6f79b21cff4a7e9a6c40b84fbc53"
}
],
"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-MHHW-J772-75H5
Vulnerability from github – Published: 2024-08-17 09:30 – Updated: 2024-08-19 21:35In the Linux kernel, the following vulnerability has been resolved:
net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling
Move the freeing of the dummy net_device from mtk_free_dev() to mtk_remove().
Previously, if alloc_netdev_dummy() failed in mtk_probe(), eth->dummy_dev would be NULL. The error path would then call mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev was allocated (but it was not), potentially causing a NULL pointer dereference.
By moving free_netdev() to mtk_remove(), we ensure it's only called when mtk_probe() has succeeded and dummy_dev is fully allocated. This addresses a potential NULL pointer dereference detected by Smatch[1].
{
"affected": [],
"aliases": [
"CVE-2024-42282"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-17T09:15:09Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mediatek: Fix potential NULL pointer dereference in dummy net_device handling\n\nMove the freeing of the dummy net_device from mtk_free_dev() to\nmtk_remove().\n\nPreviously, if alloc_netdev_dummy() failed in mtk_probe(),\neth-\u003edummy_dev would be NULL. The error path would then call\nmtk_free_dev(), which in turn called free_netdev() assuming dummy_dev\nwas allocated (but it was not), potentially causing a NULL pointer\ndereference.\n\nBy moving free_netdev() to mtk_remove(), we ensure it\u0027s only called when\nmtk_probe() has succeeded and dummy_dev is fully allocated. This\naddresses a potential NULL pointer dereference detected by Smatch[1].",
"id": "GHSA-mhhw-j772-75h5",
"modified": "2024-08-19T21:35:09Z",
"published": "2024-08-17T09:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42282"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/af6bd5c9901b13a26eaf4d57d97a813297791596"
}
],
"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-MHPV-QVQJ-2PX4
Vulnerability from github – Published: 2025-02-17 03:31 – Updated: 2025-02-17 03:31A vulnerability has been found in GNU elfutils 0.192 and classified as problematic. This vulnerability affects the function handle_dynamic_symtab of the file readelf.c of the component eu-read. The manipulation leads to null pointer dereference. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used. The patch is identified as b38e562a4c907e08171c76b8b2def8464d5a104a. It is recommended to apply a patch to fix this issue.
{
"affected": [],
"aliases": [
"CVE-2025-1371"
],
"database_specific": {
"cwe_ids": [
"CWE-404",
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-17T03:15:09Z",
"severity": "MODERATE"
},
"details": "A vulnerability has been found in GNU elfutils 0.192 and classified as problematic. This vulnerability affects the function handle_dynamic_symtab of the file readelf.c of the component eu-read. The manipulation leads to null pointer dereference. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used. The patch is identified as b38e562a4c907e08171c76b8b2def8464d5a104a. It is recommended to apply a patch to fix this issue.",
"id": "GHSA-mhpv-qvqj-2px4",
"modified": "2025-02-17T03:31:11Z",
"published": "2025-02-17T03:31:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-1371"
},
{
"type": "WEB",
"url": "https://sourceware.org/bugzilla/attachment.cgi?id=15926"
},
{
"type": "WEB",
"url": "https://sourceware.org/bugzilla/show_bug.cgi?id=32655"
},
{
"type": "WEB",
"url": "https://sourceware.org/bugzilla/show_bug.cgi?id=32655#c2"
},
{
"type": "WEB",
"url": "https://vuldb.com/?ctiid.295978"
},
{
"type": "WEB",
"url": "https://vuldb.com/?id.295978"
},
{
"type": "WEB",
"url": "https://vuldb.com/?submit.496484"
},
{
"type": "WEB",
"url": "https://www.gnu.org"
}
],
"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:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/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-MHQ5-FGP5-4GPG
Vulnerability from github – Published: 2025-09-15 15:31 – Updated: 2025-11-24 21:30In the Linux kernel, the following vulnerability has been resolved:
usb: ucsi_acpi: Increase the command completion timeout
Commit 130a96d698d7 ("usb: typec: ucsi: acpi: Increase command completion timeout value") increased the timeout from 5 seconds to 60 seconds due to issues related to alternate mode discovery.
After the alternate mode discovery switch to polled mode the timeout was reduced, but instead of being set back to 5 seconds it was reduced to 1 second.
This is causing problems when using a Lenovo ThinkPad X1 yoga gen7 connected over Type-C to a LG 27UL850-W (charging DP over Type-C).
When the monitor is already connected at boot the following error is logged: "PPM init failed (-110)", /sys/class/typec is empty and on unplugging the NULL pointer deref fixed earlier in this series happens.
When the monitor is connected after boot the following error is logged instead: "GET_CONNECTOR_STATUS failed (-110)".
Setting the timeout back to 5 seconds fixes both cases.
{
"affected": [],
"aliases": [
"CVE-2023-53168"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-15T14:15:38Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: ucsi_acpi: Increase the command completion timeout\n\nCommit 130a96d698d7 (\"usb: typec: ucsi: acpi: Increase command\ncompletion timeout value\") increased the timeout from 5 seconds\nto 60 seconds due to issues related to alternate mode discovery.\n\nAfter the alternate mode discovery switch to polled mode\nthe timeout was reduced, but instead of being set back to\n5 seconds it was reduced to 1 second.\n\nThis is causing problems when using a Lenovo ThinkPad X1 yoga gen7\nconnected over Type-C to a LG 27UL850-W (charging DP over Type-C).\n\nWhen the monitor is already connected at boot the following error\nis logged: \"PPM init failed (-110)\", /sys/class/typec is empty and\non unplugging the NULL pointer deref fixed earlier in this series\nhappens.\n\nWhen the monitor is connected after boot the following error\nis logged instead: \"GET_CONNECTOR_STATUS failed (-110)\".\n\nSetting the timeout back to 5 seconds fixes both cases.",
"id": "GHSA-mhq5-fgp5-4gpg",
"modified": "2025-11-24T21:30:57Z",
"published": "2025-09-15T15:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53168"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/02d210f434249a7edbc160969b75df030dc6934d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1e8525f37871741a52370627633962f8bdcab15a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8346d21d1d8a63f46f60e6899f4f80b1306acf32"
}
],
"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-MHRJ-PFXM-4X9V
Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-12-12 21:31In the Linux kernel, the following vulnerability has been resolved:
vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
VXLAN FDB entries can point to either a remote destination or an FDB nexthop group. The latter is usually used in EVPN deployments where learning is disabled.
However, when learning is enabled, an incoming packet might try to refresh an FDB entry that points to an FDB nexthop group and therefore does not have a remote. Such packets should be dropped, but they are only dropped after dereferencing the non-existent remote, resulting in a NPD [1] which can be reproduced using [2].
Fix by dropping such packets earlier. Remove the misleading comment from first_remote_rcu().
[1] BUG: kernel NULL pointer dereference, address: 0000000000000000 [...] CPU: 13 UID: 0 PID: 361 Comm: mausezahn Not tainted 6.17.0-rc1-virtme-g9f6b606b6b37 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc41 04/01/2014 RIP: 0010:vxlan_snoop+0x98/0x1e0 [...] Call Trace: vxlan_encap_bypass+0x209/0x240 encap_bypass_if_local+0xb1/0x100 vxlan_xmit_one+0x1375/0x17e0 vxlan_xmit+0x6b4/0x15f0 dev_hard_start_xmit+0x5d/0x1c0 __dev_queue_xmit+0x246/0xfd0 packet_sendmsg+0x113a/0x1850 __sock_sendmsg+0x38/0x70 __sys_sendto+0x126/0x180 __x64_sys_sendto+0x24/0x30 do_syscall_64+0xa4/0x260 entry_SYSCALL_64_after_hwframe+0x4b/0x53
[2] #!/bin/bash
ip address add 192.0.2.1/32 dev lo ip address add 192.0.2.2/32 dev lo
ip nexthop add id 1 via 192.0.2.3 fdb ip nexthop add id 10 group 1 fdb
ip link add name vx0 up type vxlan id 10010 local 192.0.2.1 dstport 12345 localbypass ip link add name vx1 up type vxlan id 10020 local 192.0.2.2 dstport 54321 learning
bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 192.0.2.2 port 54321 vni 10020 bridge fdb add 00:aa:bb:cc:dd:ee dev vx1 self static nhid 10
mausezahn vx0 -a 00:aa:bb:cc:dd:ee -b 00:11:22:33:44:55 -c 1 -q
{
"affected": [],
"aliases": [
"CVE-2025-39851"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-19T16:15:43Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix NPD when refreshing an FDB entry with a nexthop object\n\nVXLAN FDB entries can point to either a remote destination or an FDB\nnexthop group. The latter is usually used in EVPN deployments where\nlearning is disabled.\n\nHowever, when learning is enabled, an incoming packet might try to\nrefresh an FDB entry that points to an FDB nexthop group and therefore\ndoes not have a remote. Such packets should be dropped, but they are\nonly dropped after dereferencing the non-existent remote, resulting in a\nNPD [1] which can be reproduced using [2].\n\nFix by dropping such packets earlier. Remove the misleading comment from\nfirst_remote_rcu().\n\n[1]\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n[...]\nCPU: 13 UID: 0 PID: 361 Comm: mausezahn Not tainted 6.17.0-rc1-virtme-g9f6b606b6b37 #1 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc41 04/01/2014\nRIP: 0010:vxlan_snoop+0x98/0x1e0\n[...]\nCall Trace:\n \u003cTASK\u003e\n vxlan_encap_bypass+0x209/0x240\n encap_bypass_if_local+0xb1/0x100\n vxlan_xmit_one+0x1375/0x17e0\n vxlan_xmit+0x6b4/0x15f0\n dev_hard_start_xmit+0x5d/0x1c0\n __dev_queue_xmit+0x246/0xfd0\n packet_sendmsg+0x113a/0x1850\n __sock_sendmsg+0x38/0x70\n __sys_sendto+0x126/0x180\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0xa4/0x260\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n[2]\n #!/bin/bash\n\n ip address add 192.0.2.1/32 dev lo\n ip address add 192.0.2.2/32 dev lo\n\n ip nexthop add id 1 via 192.0.2.3 fdb\n ip nexthop add id 10 group 1 fdb\n\n ip link add name vx0 up type vxlan id 10010 local 192.0.2.1 dstport 12345 localbypass\n ip link add name vx1 up type vxlan id 10020 local 192.0.2.2 dstport 54321 learning\n\n bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 192.0.2.2 port 54321 vni 10020\n bridge fdb add 00:aa:bb:cc:dd:ee dev vx1 self static nhid 10\n\n mausezahn vx0 -a 00:aa:bb:cc:dd:ee -b 00:11:22:33:44:55 -c 1 -q",
"id": "GHSA-mhrj-pfxm-4x9v",
"modified": "2025-12-12T21:31:32Z",
"published": "2025-09-22T21:30:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39851"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0e8630f24c14d9c655d19eabe2e52a9e9f713307"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ff4f3104da6507e0f118c63c4560dfdeb59dce3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6ead38147ebb813f08be6ea8ef547a0e4c09559a"
}
],
"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-MHW2-RPWF-538R
Vulnerability from github – Published: 2024-08-17 12:30 – Updated: 2024-09-03 18:31In the Linux kernel, the following vulnerability has been resolved:
ASoc: PCM6240: Return directly after a failed devm_kzalloc() in pcmdevice_i2c_probe()
The value “-ENOMEM” was assigned to the local variable “ret” in one if branch after a devm_kzalloc() call failed at the beginning. This error code will trigger then a pcmdevice_remove() call with a passed null pointer so that an undesirable dereference will be performed. Thus return the appropriate error code directly.
{
"affected": [],
"aliases": [
"CVE-2024-43822"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-17T10:15:08Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoc: PCM6240: Return directly after a failed devm_kzalloc() in pcmdevice_i2c_probe()\n\nThe value \u201c-ENOMEM\u201d was assigned to the local variable \u201cret\u201d\nin one if branch after a devm_kzalloc() call failed at the beginning.\nThis error code will trigger then a pcmdevice_remove() call with a passed\nnull pointer so that an undesirable dereference will be performed.\nThus return the appropriate error code directly.",
"id": "GHSA-mhw2-rpwf-538r",
"modified": "2024-09-03T18:31:31Z",
"published": "2024-08-17T12:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43822"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3722873d49a1788d5420894d4f6f63e35f5c1f13"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fa6f16eff7320c91e908309e31be34cbbe4b7e58"
}
],
"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-MJ2Q-VJ3C-H4FH
Vulnerability from github – Published: 2022-05-13 01:18 – Updated: 2022-05-13 01:18In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, Null pointer dereference vulnerability may occur due to missing NULL assignment in NAT module of freed pointer.
{
"affected": [],
"aliases": [
"CVE-2018-12014"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-02-11T15:29:00Z",
"severity": "HIGH"
},
"details": "In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, Null pointer dereference vulnerability may occur due to missing NULL assignment in NAT module of freed pointer.",
"id": "GHSA-mj2q-vj3c-h4fh",
"modified": "2022-05-13T01:18:58Z",
"published": "2022-05-13T01:18:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-12014"
},
{
"type": "WEB",
"url": "https://www.codeaurora.org/security-bulletin/2019/01/07/january-2019-code-aurora-security-bulletin"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/106496"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-MJ3G-9J9X-C556
Vulnerability from github – Published: 2026-05-12 18:30 – Updated: 2026-05-12 18:30Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
{
"affected": [],
"aliases": [
"CVE-2026-40405"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-12T18:17:18Z",
"severity": "HIGH"
},
"details": "Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.",
"id": "GHSA-mj3g-9j9x-c556",
"modified": "2026-05-12T18:30:45Z",
"published": "2026-05-12T18:30:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40405"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40405"
}
],
"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-MJ6P-CV54-5PH5
Vulnerability from github – Published: 2022-05-17 02:29 – Updated: 2022-05-17 02:29When SWFTools 0.9.2 processes a crafted file in swfextract, it can lead to a NULL Pointer Dereference in the swf_FoldSprite() function in lib/rxfswf.c.
{
"affected": [],
"aliases": [
"CVE-2017-11100"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-07-07T18:29:00Z",
"severity": "HIGH"
},
"details": "When SWFTools 0.9.2 processes a crafted file in swfextract, it can lead to a NULL Pointer Dereference in the swf_FoldSprite() function in lib/rxfswf.c.",
"id": "GHSA-mj6p-cv54-5ph5",
"modified": "2022-05-17T02:29:46Z",
"published": "2022-05-17T02:29:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-11100"
},
{
"type": "WEB",
"url": "https://github.com/matthiaskramm/swftools/issues/27"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-MJ77-9WJ4-9QVH
Vulnerability from github – Published: 2022-05-14 03:10 – Updated: 2022-05-14 03:10In certain circumstances a networking event listener can be prematurely released. This appears to result in a null dereference in practice. This vulnerability affects Firefox < 52 and Thunderbird < 52.
{
"affected": [],
"aliases": [
"CVE-2017-5416"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-06-11T21:29:00Z",
"severity": "HIGH"
},
"details": "In certain circumstances a networking event listener can be prematurely released. This appears to result in a null dereference in practice. This vulnerability affects Firefox \u003c 52 and Thunderbird \u003c 52.",
"id": "GHSA-mj77-9wj4-9qvh",
"modified": "2022-05-14T03:10:01Z",
"published": "2022-05-14T03:10:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-5416"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1328121"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2017-05"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2017-09"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/96692"
},
{
"type": "WEB",
"url": "http://www.securitytracker.com/id/1037966"
}
],
"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"
}
]
}
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.