CVE-2026-80982
In the Linux kernel, the following vulnerability has been resolved:
net/smc: fix use-after-free in smc_rx_pipe_buf_release()
smc_rx_splice() hands RMB pages to a pipe and takes a socket reference per entry so the smc_sock stays alive until the reader finishes. The connection does not: a concurrent close runs smc_conn_free(), which releases the receive buffer back to the link group pool.
smc_rx_pipe_buf_release() tests sk_state before taking the socket lock. The state can change between the test and the lock, and smc_rx_update_cons() then dereferences conn->rmb_desc and walks conn->lgr, which smc_conn_free() has already released. On the is_reg_err path smcr_buf_unuse() frees the descriptor outright, so this is a use-after-free.
Leer descripción completaMostrar menos
Take the socket lock first and test conn->freed instead. smc_conn_free() sets that flag before releasing anything, and every caller holds the socket lock. The two paths exclude each other: either the pipe release runs first with everything valid, or it sees the flag and skips the update.
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 Exploitationimpact75 % - Impacto secundario
T1005Data from Local Systemcollection65 %
Vulnerabilidad de use-after-free en kernel Linux con acceso local (AV:L) y privilegios requeridos (PR:L), causando DoS y posible lectura de memoria del RMB/conexión SMC.
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/0761e49aa78c2f1362511054c6e9670653858837
- https://git.kernel.org/stable/c/0926f59ca0f94120895b92180c636a48d0ed3a6d
- https://git.kernel.org/stable/c/6a644a7340df978785f3109d1e0726a982ce2c6f
- https://git.kernel.org/stable/c/c924884743e948e25625b7fbf3ee2a9325a204a7
- https://git.kernel.org/stable/c/dadd97c8296b23aa816e91ed70041820ae087baa
- https://git.kernel.org/stable/c/df441f3efbb50eb0f120b8de4bf441c31fb0551d
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80982",
"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": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "dadd97c8296b23aa816e91ed70041820ae087baa",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "df441f3efbb50eb0f120b8de4bf441c31fb0551d",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "6a644a7340df978785f3109d1e0726a982ce2c6f",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "0761e49aa78c2f1362511054c6e9670653858837",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "0926f59ca0f94120895b92180c636a48d0ed3a6d",
"versionType": "git"
},
{
"status": "affected",
"version": "9014db202cb764b8e14c53e7bacc81f9a1a2ba7f",
"lessThan": "c924884743e948e25625b7fbf3ee2a9325a204a7",
"versionType": "git"
}
],
"programFiles": [
"net/smc/smc_rx.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/smc/smc_rx.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-11T20:19:04.667",
"references": [
{
"url": "https://git.kernel.org/stable/c/0761e49aa78c2f1362511054c6e9670653858837",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/0926f59ca0f94120895b92180c636a48d0ed3a6d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6a644a7340df978785f3109d1e0726a982ce2c6f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c924884743e948e25625b7fbf3ee2a9325a204a7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dadd97c8296b23aa816e91ed70041820ae087baa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/df441f3efbb50eb0f120b8de4bf441c31fb0551d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix use-after-free in smc_rx_pipe_buf_release()\n\nsmc_rx_splice() hands RMB pages to a pipe and takes a socket reference\nper entry so the smc_sock stays alive until the reader finishes. The\nconnection does not: a concurrent close runs smc_conn_free(), which\nreleases the receive buffer back to the link group pool.\n\nsmc_rx_pipe_buf_release() tests sk_state before taking the socket lock.\nThe state can change between the test and the lock, and\nsmc_rx_update_cons() then dereferences conn->rmb_desc and walks\nconn->lgr, which smc_conn_free() has already released. On the\nis_reg_err path smcr_buf_unuse() frees the descriptor outright, so\nthis is a use-after-free.\n\nTake the socket lock first and test conn->freed instead.\nsmc_conn_free() sets that flag before releasing anything, and every\ncaller holds the socket lock. The two paths exclude each other: either\nthe pipe release runs first with everything valid, or it sees the flag\nand skips the update."
}
],
"lastModified": "2026-09-14T13:18:52.947",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}