nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.
CVE-2026-89676
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89676
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3",
"lessThan": "bdce362f49410b9def65d76c21f6259cd89696d8",
"versionType": "git"
},
{
"status": "affected",
"version": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3",
"lessThan": "7aa34ea78f74e6ef60c8112635a87fc43d57f6c9",
"versionType": "git"
},
{
"status": "affected",
"version": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3",
"lessThan": "9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a",
"versionType": "git"
},
{
"status": "affected",
"version": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3",
"lessThan": "14b978e8d05ce018d0afbeb6611833ef91713a02",
"versionType": "git"
},
{
"status": "affected",
"version": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3",
"lessThan": "d0beaee498e11880e72826026db0e9c9890fc114",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/nfs4proc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"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",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfs4proc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89676
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46703 · Revision 1
- Added to Heist Feed
- Publisher date