CVE-2026-80710
In the Linux kernel, the following vulnerability has been resolved:
s390/dasd: Fix undersized format-check buffer
fmt_buffer_size in dasd_eckd_check_device_format() is declared as int, even though one of the multiplicands, sizeof(struct eckd_count), is a size_t. The expression
is therefore correctly evaluated at 64-bit width, but the result is silently truncated when it is stored back into the 32-bit fmt_buffer_size variable.
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For a sufficiently large track range (start_unit/stop_unit are caller-controlled) this truncation yields a buffer size far smaller than the number of tracks actually requested. kzalloc() then succeeds with an undersized allocation, while the subsequent channel program build still operates on the untruncated track count and writes past the end of that buffer.
Compute the buffer size with check_mul_overflow() and keep it in a size_t, so that a value that no longer fits results in -EINVAL instead of a silently truncated allocation size.
Detalles técnicos trazas, registros y código del informe original
trkcount * rpt_max * sizeof(struct eckd_count)
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1499.004Application or System Exploitationimpact65 %
Escalada local sin interacción (AV:L/PR:L/UI:N) mediante buffer overflow en kernel s390/dasd; permite ejecución de código o denegación de servicio con privilegios elevados.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04
- https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c
- https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86
- https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6
- https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80710",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"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": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "aca18289c86f22d3fc2f3f6ff615286e7b1702f6",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "9f88dda2f22927d22498801a92cab6a9424eaf86",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "e16e0fc54120cee3c6f0362de95aab6792865857",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "87f3389cd3920714c53e704778f7ca7f1cf0c39c",
"versionType": "git"
},
{
"status": "affected",
"version": "8fd575200db5b53f6ea6818dd017f1b43190db12",
"lessThan": "7f40b346462f563a0d6e841a77b5163d2a882a04",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/block/dasd_eckd.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-28T08:16:56.633",
"references": [
{
"url": "https://git.kernel.org/stable/c/7f40b346462f563a0d6e841a77b5163d2a882a04",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/87f3389cd3920714c53e704778f7ca7f1cf0c39c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9f88dda2f22927d22498801a92cab6a9424eaf86",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/aca18289c86f22d3fc2f3f6ff615286e7b1702f6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e16e0fc54120cee3c6f0362de95aab6792865857",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Fix undersized format-check buffer\n\nfmt_buffer_size in dasd_eckd_check_device_format() is declared as\nint, even though one of the multiplicands, sizeof(struct eckd_count),\nis a size_t. The expression\n\n trkcount * rpt_max * sizeof(struct eckd_count)\n\nis therefore correctly evaluated at 64-bit width, but the result is\nsilently truncated when it is stored back into the 32-bit\nfmt_buffer_size variable. For a sufficiently large track range\n(start_unit/stop_unit are caller-controlled) this truncation\nyields a buffer size far smaller than the number of tracks actually\nrequested. kzalloc() then succeeds with an undersized allocation,\nwhile the subsequent channel program build still operates on the\nuntruncated track count and writes past the end of that buffer.\n\nCompute the buffer size with check_mul_overflow() and keep it in a\nsize_t, so that a value that no longer fits results in -EINVAL\ninstead of a silently truncated allocation size."
}
],
"lastModified": "2026-08-29T07:16:52.503",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}