CVE-2023-54247 (GCVE-0-2023-54247)
Vulnerability from cvelistv5 – Published: 2025-12-30 12:15 – Updated: 2026-05-11 19:58
VLAI
EPSS
VEX
Title
bpf: Silence a warning in btf_type_id_size()
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/
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < 61f4bd46a03a81865aca3bcbad2f7b7032fb3160
(git)
Affected: b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < 7c4f5ab63e7962812505cbd38cc765168a223acb (git) Affected: b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef , < e6c2f594ed961273479505b42040782820190305 (git) |
guessed | |
| Linux | Linux |
Affected:
5.16
Unaffected: 0 , < 5.16 (semver) Unaffected: 6.1.110 , ≤ 6.1.* (semver) Unaffected: 6.4.7 , ≤ 6.4.* (semver) Unaffected: 6.5 , ≤ * (original_commit_for_fix) |
guessed |
{
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"affected": [
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"product": "Linux",
"programFiles": [
"kernel/bpf/btf.c"
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"vendor": "Linux",
"versions": [
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"versionType": "git"
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"versionType": "git"
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{
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"versionType": "git"
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{
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"product": "Linux",
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"kernel/bpf/btf.c"
],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.4.*",
"status": "unaffected",
"version": "6.4.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.110",
"versionStartIncluding": "5.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.4.7",
"versionStartIncluding": "5.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.5",
"versionStartIncluding": "5.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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/"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T19:58:18.212Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-54247",
"datePublished": "2025-12-30T12:15:45.395Z",
"dateReserved": "2025-12-30T12:06:44.513Z",
"dateUpdated": "2026-05-11T19:58:18.212Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2023-54247",
"date": "2026-09-23",
"epss": "0.00193",
"percentile": "0.09296"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"kernel/bpf/btf.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "61f4bd46a03a81865aca3bcbad2f7b7032fb3160",
"status": "affected",
"version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
"versionType": "git"
},
{
"lessThan": "7c4f5ab63e7962812505cbd38cc765168a223acb",
"status": "affected",
"version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
"versionType": "git"
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{
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"programFiles": [
"kernel/bpf/btf.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"lessThan": "5.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
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"version": "6.4.7",
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},
{
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"version": "6.5",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"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/"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: Silenciar una advertencia en btf_type_id_size()\n\nsyzbot inform\u00f3 una advertencia en [1] con el siguiente 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 Traza de Llamada:\n \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\nCon el siguiente 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\ny cuando bpf_attr.btf_key_type_id = 1 (DECL_TAG),\nel siguiente WARN_ON_ONCE en btf_type_id_size() se activa:\n if (WARN_ON_ONCE(!btf_type_is_modifier(size_type) \u0026amp;\u0026amp;\n !btf_type_is_var(size_type)))\n return NULL;\n\nTenga en cuenta que \u0027return NULL\u0027 es el comportamiento correcto ya que no queremos\nque un tipo DECL_TAG sea usado como btf_{key,value}_type_id incluso\npara el caso como \u0027DECL_TAG -\u0026gt; STRUCT\u0027. As\u00ed que no hay\nning\u00fan problema de correcci\u00f3n aqu\u00ed, solo queremos silenciar la advertencia.\n\nPara silenciar la advertencia, agregu\u00e9 DECL_TAG como uno de los tipos en\nbtf_type_nosize() lo que har\u00e1 que btf_type_id_size() devuelva\nNULL antes sin la advertencia.\n\n [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
}
],
"id": "CVE-2023-54247",
"lastModified": "2026-06-17T06:47:05.280",
"metrics": {},
"published": "2025-12-30T13:16:13.327",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-30T10:16:51+00:00",
"cve": "CVE-2023-54247",
"id": "CVE-2023-54247",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:known_affected": "156",
"product_status:known_not_affected": "118",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: bpf: Silence a warning in btf_type_id_size()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54247.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-29T02:03:08Z",
"cve": "CVE-2023-54247",
"id": "CVE-2023-54247",
"initial_release_date": "2025-12-31T00:27:35Z",
"product_status:known_affected": "595",
"product_status:known_not_affected": "222",
"product_status:recommended": "212",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-54247",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54247.json",
"version": "35"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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