CVE - CVE-2022-49802

CVE-ID
CVE-2022-49802	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0 URL:https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0 MISC:https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77 URL:https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77 MISC:https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9 URL:https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9 MISC:https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704 URL:https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704 MISC:https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1 URL:https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1 MISC:https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c URL:https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c MISC:https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584 URL:https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584
Assigning CNA
kernel.org
Date Record Created
20250501	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250501)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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