CVE-2026-68458
In the Linux kernel, the following vulnerability has been resolved:
binder: cache secctx size before release zeroes it
binder_transaction() bounds the scatter-gather buffer area with sg_buf_end_offset and subtracts the aligned LSM context size because the secctx is written at the tail of that area. The subtraction reads lsmctx.len, but that field has already been cleared by the time the line runs:
security_release_secctx() does memset(cp, 0, sizeof(*cp)), so lsmctx.len reads back as 0 and the subtraction contributes nothing, leaving sg_buf_end_offset too large by the aligned secctx size on every transaction to a txn_security_ctx node.
Leer descripción completaMostrar menos
Each BINDER_TYPE_PTR object then derives buf_left = sg_buf_end_offset - sg_buf_offset as the sole upper bound on its copy, so the inflated end offset lets the copy run into the bytes that already hold the secctx.
The aligned size must therefore be cached before release rather than re-read from the now-cleared field. Fix by caching it in lsmctx_aligned_size at function scope when it is first computed and subtracting lsmctx_aligned_size instead of re-reading lsmctx.len after release. Reuse the same value for the earlier buf_offset computation.
Detalles técnicos trazas, registros y código del informe original
security_secid_to_secctx(secid, &lsmctx) /* lsmctx.len set */
lsmctx_aligned_size = ALIGN(lsmctx.len, sizeof(u64))
extra_buffers_size += lsmctx_aligned_size
...
security_release_secctx(&lsmctx) /* memset zeroes len */
...
sg_buf_end_offset = sg_buf_offset + extra_buffers_size
- ALIGN(lsmctx.len, sizeof(u64)) /* ALIGN(0,8) */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: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- 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).
🎯 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
T1053Scheduled Task/Jobexecution · persistence · privilege escalation60 %
Vulnerabilidad de kernel Linux con AV:L/PR:L permite escalada de privilegios (T1068). Fallo de bounds-checking en binder permite desbordamiento de buffer que podría ejecutar código arbitrario o modificar datos del kernel.
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
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-68458",
"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": "6fba89813ccf333d2bc4d5caea04cd5f3c39eb50",
"lessThan": "1228926e1e4d605cc74d9e675558982a6f2cf446",
"versionType": "git"
},
{
"status": "affected",
"version": "6fba89813ccf333d2bc4d5caea04cd5f3c39eb50",
"lessThan": "4257f45ee1fddd0558e77b62af8bb63fd87b2162",
"versionType": "git"
},
{
"status": "affected",
"version": "6fba89813ccf333d2bc4d5caea04cd5f3c39eb50",
"lessThan": "b34826e55aad3520ec813f1f367c11b24b29dc9f",
"versionType": "git"
}
],
"programFiles": [
"drivers/android/binder.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/android/binder.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-15T06:18:15.350",
"references": [
{
"url": "https://git.kernel.org/stable/c/1228926e1e4d605cc74d9e675558982a6f2cf446",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4257f45ee1fddd0558e77b62af8bb63fd87b2162",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b34826e55aad3520ec813f1f367c11b24b29dc9f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: cache secctx size before release zeroes it\n\nbinder_transaction() bounds the scatter-gather buffer area with\nsg_buf_end_offset and subtracts the aligned LSM context size because\nthe secctx is written at the tail of that area. The subtraction reads\nlsmctx.len, but that field has already been cleared by the time the\nline runs:\n\n security_secid_to_secctx(secid, &lsmctx) /* lsmctx.len set */\n lsmctx_aligned_size = ALIGN(lsmctx.len, sizeof(u64))\n extra_buffers_size += lsmctx_aligned_size\n ...\n security_release_secctx(&lsmctx) /* memset zeroes len */\n ...\n sg_buf_end_offset = sg_buf_offset + extra_buffers_size\n - ALIGN(lsmctx.len, sizeof(u64)) /* ALIGN(0,8) */\n\nsecurity_release_secctx() does memset(cp, 0, sizeof(*cp)), so lsmctx.len\nreads back as 0 and the subtraction contributes nothing, leaving\nsg_buf_end_offset too large by the aligned secctx size on every\ntransaction to a txn_security_ctx node.\n\nEach BINDER_TYPE_PTR object then derives buf_left = sg_buf_end_offset -\nsg_buf_offset as the sole upper bound on its copy, so the inflated end\noffset lets the copy run into the bytes that already hold the secctx.\n\nThe aligned size must therefore be cached before release rather than\nre-read from the now-cleared field. Fix by caching it in\nlsmctx_aligned_size at function scope when it is first computed and\nsubtracting lsmctx_aligned_size instead of re-reading lsmctx.len after\nrelease. Reuse the same value for the earlier buf_offset computation."
}
],
"lastModified": "2026-08-17T06:17:55.003",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}