nfsd: fix cpntf publish race in nfs4_init_cp_state
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix cpntf publish race in nfs4_init_cp_state nfs4_alloc_init_cpntf_state() published the new cpntf entry into the s2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then took the lock again to list_add() it onto p_stid->sc_cp_list. In the gap the entry is reachable by so_id but cp_list is still {NULL,NULL} from kzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as cnr_stateid, so any NFSv4.2 client can drive it) reaches manage_cpntf_state() -> _free_cpntf_state_locked() and does list_del() on the zeroed list_head, oopsing the server. Fold the cs_type assignment and the list_add() into the same critical section as idr_alloc_cyclic(), so a concurrent lookup either misses the entry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after allocation and switch _free_cpntf_state_locked() to list_del_init() so a stale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and skips the list_add, preserving NFS4_COPY_STID semantics.
CVE-2026-89684
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-2026-89684
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": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "6ac469a274e3c7d87fc46ba46d83b95009680407",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "8eeca993357a0bc35aaefebfd7462ac7b0a21d9a",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "bfeac42d9074e539bacd1898dd8c14b7f5776620",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "21d6c5957f5ca97d7352e60f55ea412beb9419f5",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "a631a26a8777bb235eabd478bbbaf26a4db750bf",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "c7270f62e7a05a2ee68aa2b74262b658a14463bd",
"versionType": "git"
},
{
"status": "affected",
"version": "624322f1adc58acd0b69f77a6ddc764207e97241",
"lessThan": "be3a5c1d857b0dcbc11796cea603ef25834f75b2",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/nfs4state.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"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",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfs4state.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89684
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35171 · Revision 1
- Added to Heist Feed
- Publisher date