CVE-2026-80761
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: zero the sockaddr before returning it in getname
iso_sock_getname() fills a struct sockaddr_iso in place and returns its size without clearing it first, so bytes it does not write are copied to user space from the kernel stack. The getsockname(2) and getpeername(2) paths both run through do_getsockname(), which hands getname() an uninitialized sockaddr_storage on the stack and copies back up to the number of bytes getname() returns, so the driver has to initialize every byte it accounts for.
Two ranges are left uninitialized:
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An unprivileged process can open a BTPROTO_ISO socket and reach the pad leak with getsockname(); the broadcast leak needs an established BIS/PA connection. l2cap and rfcomm already memset their sockaddr in getname for the same reason; do the same here.
Detalles técnicos trazas, registros y código del informe original
- struct sockaddr_iso is 10 bytes but only 9 are written (family,
iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every
call.
- for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows
by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and
bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of
that structure, are never written.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: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 6/10/2026
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)
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{
"id": "CVE-2026-80761",
"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": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"lessThan": "1f6d1f2611af0eb36b133a41d29ffd2cc2601615",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "9069be87c67f290783b332c4284e09fb89cb9ea7",
"versionType": "git"
},
{
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"lessThan": "190b719b787eb4ca6c25b12fab224806f9108b06",
"versionType": "git"
},
{
"status": "affected",
"version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
"lessThan": "884cf2cc957da7ac178a0e6c6c69ddfec0481cc8",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/iso.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.11",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.1",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/iso.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-04T16:18:01.190",
"references": [
{
"url": "https://git.kernel.org/stable/c/190b719b787eb4ca6c25b12fab224806f9108b06",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/1f6d1f2611af0eb36b133a41d29ffd2cc2601615",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/884cf2cc957da7ac178a0e6c6c69ddfec0481cc8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9069be87c67f290783b332c4284e09fb89cb9ea7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: zero the sockaddr before returning it in getname\n\niso_sock_getname() fills a struct sockaddr_iso in place and returns its\nsize without clearing it first, so bytes it does not write are copied to\nuser space from the kernel stack. The getsockname(2) and getpeername(2)\npaths both run through do_getsockname(), which hands getname() an\nuninitialized sockaddr_storage on the stack and copies back up to the\nnumber of bytes getname() returns, so the driver has to initialize every\nbyte it accounts for.\n\nTwo ranges are left uninitialized:\n\n - struct sockaddr_iso is 10 bytes but only 9 are written (family,\n iso_bdaddr, iso_bdaddr_type), leaking the trailing pad byte on every\n call.\n\n - for a broadcast peer (BIS_LINK or PA_LINK) the returned length grows\n by sizeof(struct sockaddr_iso_bc), but only bc_sid, bc_num_bis and\n bc_bis are filled; bc_bdaddr and bc_bdaddr_type, the first 7 bytes of\n that structure, are never written.\n\nAn unprivileged process can open a BTPROTO_ISO socket and reach the pad\nleak with getsockname(); the broadcast leak needs an established BIS/PA\nconnection. l2cap and rfcomm already memset their sockaddr in getname\nfor the same reason; do the same here."
}
],
"lastModified": "2026-09-04T16:18:01.190",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}