CVE-2026-93212
In the Linux kernel, the following vulnerability has been resolved:
nfsd: guard nfsd_serv deref in nfsd_file_net_dispose
nfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd service thread loop calls it to drain entries that the filecache garbage collector and shrinker append via nfsd_file_dispose_list_delayed(). During per-net teardown, nn->nfsd_serv is cleared before the filecache laundrette is shut down, so the service thread can still run a dispose pass that finds more than eight entries on l->freeme and dereferences a NULL svc_serv:
The sibling helper nfsd_file_dispose_list_delayed() already documents this ordering and caches nn->nfsd_serv into a local before testing it for NULL. nfsd_file_net_dispose() was introduced with the same raw svc_wake_up(nn->nfsd_serv) call and never picked up the guard.
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Fix by loading nn->nfsd_serv into a local svc_serv pointer and only calling svc_wake_up() when it is non-NULL, matching the pattern in nfsd_file_dispose_list_delayed().
Detalles técnicos trazas, registros y código del informe original
nfsd service thread loop
nfsd_file_net_dispose(nn)
if (!list_empty(&l->freeme)) {
...
svc_wake_up(nn->nfsd_serv); /* nn->nfsd_serv == NULL */
}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: 0.17%
- 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).
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-2026-93212",
"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": "ffb402596147ac583f3464ff5c48feb9423e3838",
"lessThan": "f4776c1c4b38fbc459420321c8ece87d0f7f95fb",
"versionType": "git"
},
{
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"lessThan": "59baf45a06435194005fc5fa9a42d89f77a30432",
"versionType": "git"
},
{
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"lessThan": "766170b4fd2daaf5c4d6735560101474e18edab6",
"versionType": "git"
},
{
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"lessThan": "9f1ddfc8cb9076592401a611eb3a44d36186d014",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/filecache.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"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": [
"fs/nfsd/filecache.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-24T16:17:16.133",
"references": [
{
"url": "https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: guard nfsd_serv deref in nfsd_file_net_dispose\n\nnfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd\nservice thread loop calls it to drain entries that the filecache\ngarbage collector and shrinker append via\nnfsd_file_dispose_list_delayed(). During per-net teardown,\nnn->nfsd_serv is cleared before the filecache laundrette is shut\ndown, so the service thread can still run a dispose pass that finds\nmore than eight entries on l->freeme and dereferences a NULL\nsvc_serv:\n\n nfsd service thread loop\n nfsd_file_net_dispose(nn)\n if (!list_empty(&l->freeme)) {\n ...\n svc_wake_up(nn->nfsd_serv); /* nn->nfsd_serv == NULL */\n }\n\nThe sibling helper nfsd_file_dispose_list_delayed() already documents\nthis ordering and caches nn->nfsd_serv into a local before testing it\nfor NULL. nfsd_file_net_dispose() was introduced with the same raw\nsvc_wake_up(nn->nfsd_serv) call and never picked up the guard.\n\nFix by loading nn->nfsd_serv into a local svc_serv pointer and only\ncalling svc_wake_up() when it is non-NULL, matching the pattern in\nnfsd_file_dispose_list_delayed()."
}
],
"lastModified": "2026-09-24T16:17:16.133",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}