fkie_cve-2022-49802
Vulnerability from fkie_nvd
Published
2025-05-01 15:16
Modified
2025-05-02 13:53
Severity ?
Summary
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
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ftrace: Corregir la desreferencia de puntero nulo en ftrace_add_mod() @ftrace_mod se asigna mediante kzalloc(), por lo que ambos miembros {prev,next} de @ftrace_mode-\u0026gt;list son NULL, no es un estado v\u00e1lido para llamar a list_del(). Si kstrdup() para @ftrace_mod-\u0026gt;{func|module} falla, va a la etiqueta @out_free y llama a free_ftrace_mod() para destruir @ftrace_mod, entonces list_del() escribir\u00e1 prev-\u0026gt;next y next-\u0026gt;prev, donde ocurre la desreferencia de puntero nulo. ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000008 Oops: 0002 [#1] PREEMPT SMP NOPTI Call Trace: ftrace_mod_callback+0x20d/0x220 ? P\u00e1nico del kernel: no se sincroniza: Excepci\u00f3n fatal Por lo tanto, llame a INIT_LIST_HEAD() para inicializar el miembro de la lista para corregir este problema."
}
],
"id": "CVE-2022-49802",
"lastModified": "2025-05-02T13:53:20.943",
"metrics": {},
"published": "2025-05-01T15:16:03.510",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/19ba6c8af9382c4c05dc6a0a79af3013b9a35cd0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1bea037a1abb23a6729bef36a2265a4565f5ea77"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/665b4c6648bf2b91f69b33817f4321cf4c3cafe9"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6a14828caddad0d989495a72af678adf60992704"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/6e50eb4b1807017f6c2d5089064256ce2de8aef1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b5bfc61f541d3f092b13dedcfe000d86eb8e133c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f715f31559b82e3f75ce047fa476de63d8107584"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- 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.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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