ghsa-5fcv-vwgv-jrcx
Vulnerability from github
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:
So call INIT_LIST_HEAD() to initialize the list member to fix this issue.
{
"affected": [],
"aliases": [
"CVE-2022-49802"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T15:16:03Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Fix null pointer dereference in ftrace_add_mod()\n\nThe @ftrace_mod is allocated by kzalloc(), so both the members {prev,next}\nof @ftrace_mode-\u003elist are NULL, it\u0027s not a valid state to call list_del().\nIf kstrdup() for @ftrace_mod-\u003e{func|module} fails, it goes to @out_free\ntag and calls free_ftrace_mod() to destroy @ftrace_mod, then list_del()\nwill write prev-\u003enext and next-\u003eprev, where null pointer dereference\nhappens.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\nOops: 0002 [#1] PREEMPT SMP NOPTI\nCall Trace:\n \u003cTASK\u003e\n ftrace_mod_callback+0x20d/0x220\n ? do_filp_open+0xd9/0x140\n ftrace_process_regex.isra.51+0xbf/0x130\n ftrace_regex_write.isra.52.part.53+0x6e/0x90\n vfs_write+0xee/0x3a0\n ? __audit_filter_op+0xb1/0x100\n ? auditd_test_task+0x38/0x50\n ksys_write+0xa5/0xe0\n do_syscall_64+0x3a/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nKernel panic - not syncing: Fatal exception\n\nSo call INIT_LIST_HEAD() to initialize the list member to fix this issue.",
"id": "GHSA-5fcv-vwgv-jrcx",
"modified": "2025-05-01T15:31:47Z",
"published": "2025-05-01T15:31:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49802"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584"
}
],
"schema_version": "1.4.0",
"severity": []
}
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.