nfsd: fix clock domain mismatch in clients_still_reclaiming()
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix clock domain mismatch in clients_still_reclaiming() clients_still_reclaiming() computes a deadline from nn->boot_time (CLOCK_REALTIME, ~1.7 billion) but compares it against ktime_get_boottime_seconds() (CLOCK_BOOTTIME, seconds since boot). The comparison is always false — it would take ~54 years of uptime for BOOTTIME to exceed the REALTIME-derived deadline. This means any client can hold the server in grace indefinitely by sending CLAIM_PREVIOUS OPEN requests, blocking all non-reclaim operations for all other clients. Add boot_time_bt (CLOCK_BOOTTIME) alongside the existing boot_time and use it for the deadline computation. boot_time (CLOCK_REALTIME) is preserved for its cl_boot clientid-nonce role.
CVE-2026-89685
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-2026-89685
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": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
"lessThan": "04c3e4456fe76e8d7c94171009df3165c3262c51",
"versionType": "git"
},
{
"status": "affected",
"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
"lessThan": "e92e80c5b043108029bc729b30d12c37158fb9cb",
"versionType": "git"
},
{
"status": "affected",
"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
"lessThan": "f9cec313efb2fd18d962aad738a4892bce806016",
"versionType": "git"
},
{
"status": "affected",
"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
"lessThan": "9843649196221152b6e5d138a3ce859bdaae1d96",
"versionType": "git"
},
{
"status": "affected",
"version": "20b7d86f29d39e8ae19bb29c24ffee70dc385ddf",
"lessThan": "09ea3eb9a518565f5bca386e81b993ed8825f5e8",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/netns.h",
"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": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"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/netns.h",
"fs/nfsd/nfs4state.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89685
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46705 · Revision 1
- Added to Heist Feed
- Publisher date