CVE-2023-54247
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
bpf: Silence a warning in btf_type_id_size()
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.
Detalles técnicos trazas, registros y código del informe original
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;
[1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
Mostrar
{
"id": "CVE-2023-54247",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
"lessThan": "61f4bd46a03a81865aca3bcbad2f7b7032fb3160",
"versionType": "git"
},
{
"status": "affected",
"version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
"lessThan": "7c4f5ab63e7962812505cbd38cc765168a223acb",
"versionType": "git"
},
{
"status": "affected",
"version": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef",
"lessThan": "e6c2f594ed961273479505b42040782820190305",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/btf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.110",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.4.7",
"versionType": "semver",
"lessThanOrEqual": "6.4.*"
},
{
"status": "unaffected",
"version": "6.5",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/btf.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-30T13:16:13.327",
"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"
}
],
"vulnStatus": "Deferred",
"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 <TASK>\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 'a' type_id=4 component_idx=-1\n [2] PTR '(anon)' type_id=0\n [3] TYPE_TAG 'a' type_id=2\n [4] VAR 'a' 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) &&\n !btf_type_is_var(size_type)))\n return NULL;\n\nNote that 'return NULL' is the correct behavior as we don't want\na DECL_TAG type to be used as a btf_{key,value}_type_id even\nfor the case like 'DECL_TAG -> STRUCT'. 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 informó 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 'a' type_id=4 component_idx=-1\n [2] PTR '(anon)' type_id=0\n [3] TYPE_TAG 'a' type_id=2\n [4] VAR 'a' 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) &&\n !btf_type_is_var(size_type)))\n return NULL;\n\nTenga en cuenta que 'return NULL' 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 'DECL_TAG -> STRUCT'. Así que no hay\nningún problema de corrección aquí, solo queremos silenciar la advertencia.\n\nPara silenciar la advertencia, agregué DECL_TAG como uno de los tipos en\nbtf_type_nosize() lo que hará que btf_type_id_size() devuelva\nNULL antes sin la advertencia.\n\n [1] https://lore.kernel.org/bpf/000000000000e0df8d05fc75ba86@google.com/"
}
],
"lastModified": "2026-06-17T06:47:05.280",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}