CVE-2023-54247 (GCVE-0-2023-54247)
Vulnerability from cvelistv5
Published
2025-12-30 12:15
Modified
2025-12-30 12:15
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Silence a warning in btf_type_id_size()
syzbot reported a warning in [1] with the following stacktrace:
WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988
...
RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988
...
Call Trace:
<TASK>
map_check_btf kernel/bpf/syscall.c:1024 [inline]
map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198
__sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040
__do_sys_bpf kernel/bpf/syscall.c:5162 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5160 [inline]
__x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
With the following btf
[1] DECL_TAG 'a' type_id=4 component_idx=-1
[2] PTR '(anon)' type_id=0
[3] TYPE_TAG 'a' type_id=2
[4] VAR 'a' type_id=3, linkage=static
and when the bpf_attr.btf_key_type_id = 1 (DECL_TAG),
the following WARN_ON_ONCE in btf_type_id_size() is triggered:
if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) &&
!btf_type_is_var(size_type)))
return NULL;
Note that 'return NULL' is the correct behavior as we don't want
a DECL_TAG type to be used as a btf_{key,value}_type_id even
for the case like 'DECL_TAG -> STRUCT'. So there
is no correctness issue here, we just want to silence warning.
To silence the warning, I added DECL_TAG as one of kinds in
btf_type_nosize() which will cause btf_type_id_size() returning
NULL earlier without the warning.
[1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/
References
Impacted products
{
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"product": "Linux",
"programFiles": [
"kernel/bpf/btf.c"
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versions": [
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
}
]
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"status": "unaffected",
"version": "6.1.110",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.4.7",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Silence a warning in btf_type_id_size()\n\nsyzbot reported a warning in [1] with the following stacktrace:\n WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n ...\n RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\n ...\n Call Trace:\n \u003cTASK\u003e\n map_check_btf kernel/bpf/syscall.c:1024 [inline]\n map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198\n __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040\n __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]\n __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nWith the following btf\n [1] DECL_TAG \u0027a\u0027 type_id=4 component_idx=-1\n [2] PTR \u0027(anon)\u0027 type_id=0\n [3] TYPE_TAG \u0027a\u0027 type_id=2\n [4] VAR \u0027a\u0027 type_id=3, linkage=static\nand when the bpf_attr.btf_key_type_id = 1 (DECL_TAG),\nthe following WARN_ON_ONCE in btf_type_id_size() is triggered:\n if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026\u0026\n !btf_type_is_var(size_type)))\n return NULL;\n\nNote that \u0027return NULL\u0027 is the correct behavior as we don\u0027t want\na DECL_TAG type to be used as a btf_{key,value}_type_id even\nfor the case like \u0027DECL_TAG -\u003e STRUCT\u0027. So there\nis no correctness issue here, we just want to silence warning.\n\nTo silence the warning, I added DECL_TAG as one of kinds in\nbtf_type_nosize() which will cause btf_type_id_size() returning\nNULL earlier without the warning.\n\n [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
}
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"dateUpdated": "2025-12-30T12:15:45.395Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/61f4bd46a03a81865aca3bcbad2f7b7032fb3160"
},
{
"url": "https://git.kernel.org/stable/c/7c4f5ab63e7962812505cbd38cc765168a223acb"
},
{
"url": "https://git.kernel.org/stable/c/e6c2f594ed961273479505b42040782820190305"
}
],
"title": "bpf: Silence a warning in btf_type_id_size()",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"cveId": "CVE-2023-54247",
"datePublished": "2025-12-30T12:15:45.395Z",
"dateReserved": "2025-12-30T12:06:44.513Z",
"dateUpdated": "2025-12-30T12:15:45.395Z",
"state": "PUBLISHED"
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"nvd": "{\"cve\":{\"id\":\"CVE-2023-54247\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:13.327\",\"lastModified\":\"2025-12-31T20:42:43.210\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Silence a warning in btf_type_id_size()\\n\\nsyzbot reported a warning in [1] with the following stacktrace:\\n WARNING: CPU: 0 PID: 5005 at kernel/bpf/btf.c:1988 btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\\n ...\\n RIP: 0010:btf_type_id_size+0x2d9/0x9d0 kernel/bpf/btf.c:1988\\n ...\\n Call Trace:\\n \u003cTASK\u003e\\n map_check_btf kernel/bpf/syscall.c:1024 [inline]\\n map_create+0x1157/0x1860 kernel/bpf/syscall.c:1198\\n __sys_bpf+0x127f/0x5420 kernel/bpf/syscall.c:5040\\n __do_sys_bpf kernel/bpf/syscall.c:5162 [inline]\\n __se_sys_bpf kernel/bpf/syscall.c:5160 [inline]\\n __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5160\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\nWith the following btf\\n [1] DECL_TAG \u0027a\u0027 type_id=4 component_idx=-1\\n [2] PTR \u0027(anon)\u0027 type_id=0\\n [3] TYPE_TAG \u0027a\u0027 type_id=2\\n [4] VAR \u0027a\u0027 type_id=3, linkage=static\\nand when the bpf_attr.btf_key_type_id = 1 (DECL_TAG),\\nthe following WARN_ON_ONCE in btf_type_id_size() is triggered:\\n if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026\u0026\\n !btf_type_is_var(size_type)))\\n return NULL;\\n\\nNote that \u0027return NULL\u0027 is the correct behavior as we don\u0027t want\\na DECL_TAG type to be used as a btf_{key,value}_type_id even\\nfor the case like \u0027DECL_TAG -\u003e STRUCT\u0027. So there\\nis no correctness issue here, we just want to silence warning.\\n\\nTo silence the warning, I added DECL_TAG as one of kinds in\\nbtf_type_nosize() which will cause btf_type_id_size() returning\\nNULL earlier without the warning.\\n\\n [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/61f4bd46a03a81865aca3bcbad2f7b7032fb3160\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c4f5ab63e7962812505cbd38cc765168a223acb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e6c2f594ed961273479505b42040782820190305\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- 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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