sunrpc: route to a populated pool in svc_pool_for_cpu()
In the Linux kernel, the following vulnerability has been resolved: sunrpc: route to a populated pool in svc_pool_for_cpu() svc_set_num_threads() spreads the requested threads evenly across the service's pools (base = nrservs / sv_nrpools). When a service runs fewer threads than it has pools -- e.g. an nfsd configured with fewer threads than the host has NUMA nodes while running in "pernode" or "percpu" mode -- the trailing pools are left with no threads at all. svc_xprt_enqueue() selects a pool from the CPU servicing the transport, queues the transport on that pool's sp_xprts, and only wakes a thread from the same pool. Each thread services exclusively its own pool, so a transport that lands on a threadless pool is enqueued on sp_xprts and never picked up: the connection hangs indefinitely. Have svc_pool_for_cpu() skip pools that currently have no threads, falling back to the next populated pool. This trades NUMA locality for a guarantee that the work is actually serviced. sp_nrthreads is only updated under the service mutex; the lockless read here is a best-effort routing hint, so annotate it with data_race().
CVE-2026-89549
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-2026-89549
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": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "9accc25e5af0bac8479f6054e674b2c593c45281",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "edb20e8c03aebacb409968c99d046f509c6c485a",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "011479cf9a7657d4a3e7cc42a784ac63df594170",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "9d04d64ad192439835ed9884d767353061c3ed6f",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "8f766d2d0b4dabf54f8b35812df2b4f481d13316",
"versionType": "git"
},
{
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"lessThan": "f6310491c4cdb88af73aa551ec9df1f10a90c709",
"versionType": "git"
}
],
"programFiles": [
"net/sunrpc/svc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.19",
"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": [
"net/sunrpc/svc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89549
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35065 · Revision 1
- Added to Heist Feed
- Publisher date