NFS/localio: fix ref leak on nfs_uuid_add_file failure
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: fix ref leak on nfs_uuid_add_file failure When nfs_uuid_add_file() races with nfs_uuid_put() tearing down uuid->net, it returns -ENXIO without publishing nfl->nfs_uuid via rcu_assign_pointer(). nfs_open_local_fh() then enters its error branch and only releases the slot's file ref and its paired net ref plus its own entry-time net ref, while the close path is a no-op: nfs_close_local_fh() nfs_uuid = rcu_dereference(nfl->nfs_uuid); if (!nfs_uuid) { rcu_read_unlock(); return; } /* always */ nfsd_open_local_fh() returns localio holding a caller-owned +1 nfsd_file reference (from nfsd_file_get() after nfsd_file_acquire_local()) and an entry-time nfsd_net reference (from its first nfsd_net_try_get()) embedded as nf->nf_net. Both are leaked on the failure path, pinning one nfsd_file (and the underlying struct file, dentry, inode) and one nfsd_net_ref per occurrence, which blocks nfsd_net and netns teardown. Fix by releasing the caller-owned file ref and its net ref through the existing helper, using a stack-local RCU pointer so the helper can xchg it out, then returning -ENXIO so callers do not dereference a localio whose slot has been cleared: struct nfsd_file __rcu *tmp = RCU_INITIALIZER(localio); nfs_to_nfsd_file_put_local(pnf); nfs_to_nfsd_file_put_local(&tmp); localio = ERR_PTR(-ENXIO); The trailing nfs_to_nfsd_net_put(net) continues to release the outer net ref, so all three nfsd_net_try_get() inc
CVE-2026-89715
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-2026-89715
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": "fdd015de767977f21892329af5e12276eb80375f",
"lessThan": "5215e734bf7cba18237155f8cb2a0accb60ca339",
"versionType": "git"
},
{
"status": "affected",
"version": "fdd015de767977f21892329af5e12276eb80375f",
"lessThan": "9f59b05423ed381f8cdeaaae4bd6778adcb6865c",
"versionType": "git"
},
{
"status": "affected",
"version": "fdd015de767977f21892329af5e12276eb80375f",
"lessThan": "ca018c19e0ba38975e5ddc3ef8117d5b734313aa",
"versionType": "git"
},
{
"status": "affected",
"version": "55735dc5a0ee0c0fc14cb51e005eae862906a410",
"versionType": "git"
},
{
"status": "affected",
"version": "7cac8a129fc53497f9ee5d66fca55a245d009b97",
"versionType": "git"
},
{
"status": "affected",
"version": "6.15.10",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.16.1",
"lessThan": "6.17",
"versionType": "semver"
}
],
"programFiles": [
"fs/nfs_common/nfslocalio.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"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/nfs_common/nfslocalio.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89715
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35194 · Revision 1
- Added to Heist Feed
- Publisher date