In the Linux kernel, the following vulnerability has been resolved:
ftrace: Fix null pointer dereference in ftrace_add_mod()
The @ftrace_mod is allocated by kzalloc(), so both the members {prev,next}
of @ftrace_mode->list are NULL, it's not a valid state to call list_del().
If kstrdup() for @ftrace_mod->{func|module} fails, it goes to @out_free
tag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del()
will write prev->next and next->prev, where null pointer dereference
happens.
BUG: kernel NULL pointer dereference, address: 0000000000000008
Oops: 0002 [#1] PREEMPT SMP NOPTI
Call Trace:
<TASK>
ftrace_mod_callback+0x20d/0x220
? do_filp_open+0xd9/0x140
ftrace_process_regex.isra.51+0xbf/0x130
ftrace_regex_write.isra.52.part.53+0x6e/0x90
vfs_write+0xee/0x3a0
? __audit_filter_op+0xb1/0x100
? auditd_test_task+0x38/0x50
ksys_write+0xa5/0xe0
do_syscall_64+0x3a/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Kernel panic - not syncing: Fatal exception
So call INIT_LIST_HEAD() to initialize the list member to fix this issue.
References
Configurations
Configuration 1 (hide)
|
History
07 Nov 2025, 19:02
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:* |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-476 | |
| References | () https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0 - Patch | |
| References | () https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77 - Patch | |
| References | () https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9 - Patch | |
| References | () https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704 - Patch | |
| References | () https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1 - Patch | |
| References | () https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c - Patch | |
| References | () https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584 - Patch | |
| First Time |
Linux linux Kernel
Linux |
Information
Published : 2025-05-01 15:16
Updated : 2025-11-07 19:02
NVD link : CVE-2022-49802
Mitre link : CVE-2022-49802
CVE.ORG link : CVE-2022-49802
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference