NFSD: fix hang in nfsd4_shutdown_callback
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.
CVE-2025-21795
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-2025-21795
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": "67ef9e5fd737eab2495f2586df7e9ea30caa1b77",
"lessThan": "abed68027ea3ab893ac85cc46a00e2e64a324239",
"versionType": "git"
},
{
"status": "affected",
"version": "26540b8940a2e21582afa61a6fb8af87310bac72",
"lessThan": "efa8a261c575f816c7e79a87aeb3ef8a0bd6b221",
"versionType": "git"
},
{
"status": "affected",
"version": "66af25799940b26efd41ea6e648f75c41a48a2c2",
"lessThan": "38d345f612503b850c2973e5a879f88e441b34d7",
"versionType": "git"
},
{
"status": "affected",
"version": "66af25799940b26efd41ea6e648f75c41a48a2c2",
"lessThan": "23ad7797c74cd8f7f90617f1e59a8703e2b43908",
"versionType": "git"
},
{
"status": "affected",
"version": "66af25799940b26efd41ea6e648f75c41a48a2c2",
"lessThan": "cedfbb92cf97a6bff3d25633001d9c44442ee854",
"versionType": "git"
},
{
"status": "affected",
"version": "66af25799940b26efd41ea6e648f75c41a48a2c2",
"lessThan": "e88d2451cd42e025465d6b51fd716a47b0b3800d",
"versionType": "git"
},
{
"status": "affected",
"version": "66af25799940b26efd41ea6e648f75c41a48a2c2",
"lessThan": "036ac2778f7b28885814c6fbc07e156ad1624d03",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.220",
"lessThan": "5.10.235",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.154",
"lessThan": "5.15.179",
"versionType": "semver"
}
],
"programFiles": [
"fs/nfsd/nfs4callback.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.79",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.16",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.4",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfs4callback.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21795
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26947 · Revision 1
- Added to Heist Feed
- Publisher date