CVE-2026-98305
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: mxl862xx: disable the stats poll on teardown
mxl862xx_setup() arms the stats poll before mxl862xx_setup_mdio(), and nothing stops it until dsa_register_switch() has returned an error to mxl862xx_probe(). DSA frees the dsa_port list before it returns, so a poll that fires once .setup or a later step of dsa_tree_setup() has failed walks freed ports. On shutdown the user ports stay registered, and the WORK_STOPPED flag test in mxl862xx_get_stats64() is not atomic with the cancel in mxl862xx_shutdown(), so a re-arm that read the flag before it was set queues the poll after cancel_delayed_work_sync() has returned.
Leer descripción completaMostrar menos
Arm the poll once .setup has succeeded and stop it from a .teardown op, which DSA calls on unregister and after a failed registration, in both cases before it frees the ports. Use disable_delayed_work_sync() there and in shutdown(): it drains a running poll as the cancel did and turns every later attempt to queue the work into a no-op, so the re-arm cannot bring the poll back. remove() and the probe error path only set WORK_STOPPED, which crc_err_work tests before it walks the ports.
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: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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
T1499.004Application or System Exploitationimpact70 %
Vulnerabilidad local (AV:L, PR:L) que permite acceso a memoria/recursos del kernel mediante use-after-free en polling de estadísticas. Causa DoS por corrupción de estructura de datos.
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-2026-98305",
"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": "a21d33a5265f0b31d935a8b9b2b6faefb5185911",
"lessThan": "97df811a11d4f76bc2ffe67b6bf730263f56c668",
"versionType": "git"
},
{
"status": "affected",
"version": "a21d33a5265f0b31d935a8b9b2b6faefb5185911",
"lessThan": "9e92ad4630f5dd1838ce6bbe6b1bd2c73d34de36",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/dsa/mxl862xx/mxl862xx.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/dsa/mxl862xx/mxl862xx.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-06T09:18:21.660",
"references": [
{
"url": "https://git.kernel.org/stable/c/97df811a11d4f76bc2ffe67b6bf730263f56c668",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9e92ad4630f5dd1838ce6bbe6b1bd2c73d34de36",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: mxl862xx: disable the stats poll on teardown\n\nmxl862xx_setup() arms the stats poll before mxl862xx_setup_mdio(), and\nnothing stops it until dsa_register_switch() has returned an error to\nmxl862xx_probe(). DSA frees the dsa_port list before it returns, so a\npoll that fires once .setup or a later step of dsa_tree_setup() has\nfailed walks freed ports. On shutdown the user ports stay registered,\nand the WORK_STOPPED flag test in mxl862xx_get_stats64() is not atomic\nwith the cancel in mxl862xx_shutdown(), so a re-arm that read the flag\nbefore it was set queues the poll after cancel_delayed_work_sync() has\nreturned.\n\nArm the poll once .setup has succeeded and stop it from a .teardown op,\nwhich DSA calls on unregister and after a failed registration, in both\ncases before it frees the ports. Use disable_delayed_work_sync() there\nand in shutdown(): it drains a running poll as the cancel did and turns\nevery later attempt to queue the work into a no-op, so the re-arm\ncannot bring the poll back. remove() and the probe error path only set\nWORK_STOPPED, which crc_err_work tests before it walks the ports."
}
],
"lastModified": "2026-10-07T07:17:08.357",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}