CVE-2026-93212 (GCVE-0-2026-93212)
Vulnerability from cvelistv5 – Published: 2026-09-24 15:10 – Updated: 2026-10-19 09:07
VLAI
EPSS
VEX
Title
nfsd: guard nfsd_serv deref in nfsd_file_net_dispose
Summary
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:
nfsd service thread loop
nfsd_file_net_dispose(nn)
if (!list_empty(&l->freeme)) {
...
svc_wake_up(nn->nfsd_serv); /* nn->nfsd_serv == NULL */
}
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.
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ffb402596147ac583f3464ff5c48feb9423e3838 , < f4776c1c4b38fbc459420321c8ece87d0f7f95fb
(git)
Affected: ffb402596147ac583f3464ff5c48feb9423e3838 , < 59baf45a06435194005fc5fa9a42d89f77a30432 (git) Affected: ffb402596147ac583f3464ff5c48feb9423e3838 , < 766170b4fd2daaf5c4d6735560101474e18edab6 (git) Affected: ffb402596147ac583f3464ff5c48feb9423e3838 , < 9f1ddfc8cb9076592401a611eb3a44d36186d014 (git) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/nfsd/filecache.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f4776c1c4b38fbc459420321c8ece87d0f7f95fb",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "59baf45a06435194005fc5fa9a42d89f77a30432",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "766170b4fd2daaf5c4d6735560101474e18edab6",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "9f1ddfc8cb9076592401a611eb3a44d36186d014",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/nfsd/filecache.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "6.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003efreeme: 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-\u003enfsd_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-\u003efreeme and dereferences a NULL\nsvc_serv:\n\n nfsd service thread loop\n nfsd_file_net_dispose(nn)\n if (!list_empty(\u0026l-\u003efreeme)) {\n ...\n svc_wake_up(nn-\u003enfsd_serv); /* nn-\u003enfsd_serv == NULL */\n }\n\nThe sibling helper nfsd_file_dispose_list_delayed() already documents\nthis ordering and caches nn-\u003enfsd_serv into a local before testing it\nfor NULL. nfsd_file_net_dispose() was introduced with the same raw\nsvc_wake_up(nn-\u003enfsd_serv) call and never picked up the guard.\n\nFix by loading nn-\u003enfsd_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()."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T09:07:24.291Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb"
},
{
"url": "https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432"
},
{
"url": "https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6"
},
{
"url": "https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014"
}
],
"title": "nfsd: guard nfsd_serv deref in nfsd_file_net_dispose",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-93212",
"datePublished": "2026-09-24T15:10:35.280Z",
"dateReserved": "2026-09-17T16:02:15.093Z",
"dateUpdated": "2026-10-19T09:07:24.291Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-93212",
"date": "2026-11-02",
"epss": "0.00168",
"percentile": "0.06065"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/nfsd/filecache.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f4776c1c4b38fbc459420321c8ece87d0f7f95fb",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "59baf45a06435194005fc5fa9a42d89f77a30432",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "766170b4fd2daaf5c4d6735560101474e18edab6",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
},
{
"lessThan": "9f1ddfc8cb9076592401a611eb3a44d36186d014",
"status": "affected",
"version": "ffb402596147ac583f3464ff5c48feb9423e3838",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/nfsd/filecache.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"lessThan": "6.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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-\u003efreeme: 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-\u003enfsd_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-\u003efreeme and dereferences a NULL\nsvc_serv:\n\n nfsd service thread loop\n nfsd_file_net_dispose(nn)\n if (!list_empty(\u0026l-\u003efreeme)) {\n ...\n svc_wake_up(nn-\u003enfsd_serv); /* nn-\u003enfsd_serv == NULL */\n }\n\nThe sibling helper nfsd_file_dispose_list_delayed() already documents\nthis ordering and caches nn-\u003enfsd_serv into a local before testing it\nfor NULL. nfsd_file_net_dispose() was introduced with the same raw\nsvc_wake_up(nn-\u003enfsd_serv) call and never picked up the guard.\n\nFix by loading nn-\u003enfsd_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()."
}
],
"id": "CVE-2026-93212",
"lastModified": "2026-10-19T10:17:12.113",
"metrics": {},
"published": "2026-09-24T16:17:16.133",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-10-29T13:10:39+00:00",
"cve": "CVE-2026-93212",
"id": "CVE-2026-93212",
"initial_release_date": "2026-09-24T00:00:00+00:00",
"product_status:known_affected": "185",
"product_status:known_not_affected": "93",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: nfsd: guard nfsd_serv deref in nfsd_file_net_dispose",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93212.json",
"version": "3"
}
}
}
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