CVE-2023-52468 (GCVE-0-2023-52468)
Vulnerability from cvelistv5
Published
2024-02-25 08:16
Modified
2025-05-04 07:37
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
class: fix use-after-free in class_register()
The lock_class_key is still registered and can be found in
lock_keys_hash hlist after subsys_private is freed in error
handler path.A task who iterate over the lock_keys_hash
later may cause use-after-free.So fix that up and unregister
the lock_class_key before kfree(cp).
On our platform, a driver fails to kset_register because of
creating duplicate filename '/class/xxx'.With Kasan enabled,
it prints a invalid-access bug report.
KASAN bug report:
BUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc
Write of size 8 at addr 15ffff808b8c0368 by task modprobe/252
Pointer tag: [15], memory tag: [fe]
CPU: 7 PID: 252 Comm: modprobe Tainted: G W
6.6.0-mainline-maybe-dirty #1
Call trace:
dump_backtrace+0x1b0/0x1e4
show_stack+0x2c/0x40
dump_stack_lvl+0xac/0xe0
print_report+0x18c/0x4d8
kasan_report+0xe8/0x148
__hwasan_store8_noabort+0x88/0x98
lockdep_register_key+0x19c/0x1bc
class_register+0x94/0x1ec
init_module+0xbc/0xf48 [rfkill]
do_one_initcall+0x17c/0x72c
do_init_module+0x19c/0x3f8
...
Memory state around the buggy address:
ffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a
ffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe
>ffffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03
As CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access
not use-after-free here.In this case, modprobe is manipulating
the corrupted lock_keys_hash hlish where lock_class_key is already
freed before.
It's worth noting that this only can happen if lockdep is enabled,
which is not true for normal system.
References
Impacted products
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\"https://git.kernel.org/stable/c/93ec4a3b76404bce01bd5c9032bef5df6feb1d62\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nclass: fix use-after-free in class_register()\\n\\nThe lock_class_key is still registered and can be found in\\nlock_keys_hash hlist after subsys_private is freed in error\\nhandler path.A task who iterate over the lock_keys_hash\\nlater may cause use-after-free.So fix that up and unregister\\nthe lock_class_key before kfree(cp).\\n\\nOn our platform, a driver fails to kset_register because of\\ncreating duplicate filename \u0027/class/xxx\u0027.With Kasan enabled,\\nit prints a invalid-access bug report.\\n\\nKASAN bug report:\\n\\nBUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc\\nWrite of size 8 at addr 15ffff808b8c0368 by task modprobe/252\\nPointer tag: [15], memory tag: [fe]\\n\\nCPU: 7 PID: 252 Comm: modprobe Tainted: G W\\n 6.6.0-mainline-maybe-dirty #1\\n\\nCall trace:\\ndump_backtrace+0x1b0/0x1e4\\nshow_stack+0x2c/0x40\\ndump_stack_lvl+0xac/0xe0\\nprint_report+0x18c/0x4d8\\nkasan_report+0xe8/0x148\\n__hwasan_store8_noabort+0x88/0x98\\nlockdep_register_key+0x19c/0x1bc\\nclass_register+0x94/0x1ec\\ninit_module+0xbc/0xf48 [rfkill]\\ndo_one_initcall+0x17c/0x72c\\ndo_init_module+0x19c/0x3f8\\n...\\nMemory state around the buggy address:\\nffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a\\nffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe\\n\u003effffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe\\n ^\\nffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03\\n\\nAs CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access\\nnot use-after-free here.In this case, modprobe is manipulating\\nthe corrupted lock_keys_hash hlish where lock_class_key is already\\nfreed before.\\n\\nIt\u0027s worth noting that this only can happen if lockdep is enabled,\\nwhich is not true for normal system.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:37:20.416Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-52468\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:37:20.416Z\", \"dateReserved\": \"2024-02-20T12:30:33.297Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-25T08:16:32.387Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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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