CVE-2026-89549 (GCVE-0-2026-89549)
Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-10-19 08:48
VLAI
EPSS
VEX
Title
sunrpc: route to a populated pool in svc_pool_for_cpu()
Summary
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().
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:23 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
bfd241600a3b0db4fe43c859f1460d0a958d924a , < 9accc25e5af0bac8479f6054e674b2c593c45281
(git)
Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < 6f66d38e2a6c78d48723ea17ad86135ec80ca24b (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < edb20e8c03aebacb409968c99d046f509c6c485a (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < 011479cf9a7657d4a3e7cc42a784ac63df594170 (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < 9d04d64ad192439835ed9884d767353061c3ed6f (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < 8f766d2d0b4dabf54f8b35812df2b4f481d13316 (git) Affected: bfd241600a3b0db4fe43c859f1460d0a958d924a , < f6310491c4cdb88af73aa551ec9df1f10a90c709 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.19
Unaffected: 0 , < 2.6.19 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-06T01:17:44+00:00",
"cve": "CVE-2026-89549",
"id": "CVE-2026-89549",
"initial_release_date": "2026-09-11T00:00:00+00:00",
"product_status:known_affected": "203",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sunrpc: route to a populated pool in svc_pool_for_cpu()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89549.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-89549",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T19:23:44.786723Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T19:23:45.768Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sunrpc/svc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9accc25e5af0bac8479f6054e674b2c593c45281",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "6f66d38e2a6c78d48723ea17ad86135ec80ca24b",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "edb20e8c03aebacb409968c99d046f509c6c485a",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "011479cf9a7657d4a3e7cc42a784ac63df594170",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "9d04d64ad192439835ed9884d767353061c3ed6f",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "8f766d2d0b4dabf54f8b35812df2b4f481d13316",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
},
{
"lessThan": "f6310491c4cdb88af73aa551ec9df1f10a90c709",
"status": "affected",
"version": "bfd241600a3b0db4fe43c859f1460d0a958d924a",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/sunrpc/svc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"lessThan": "2.6.19",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.270",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.109",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.50",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.4",
"versionStartIncluding": "2.6.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "2.6.19",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice\u0027s pools (base = nrservs / sv_nrpools). When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool\u0027s sp_xprts, and only wakes a thread\nfrom the same pool. Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool. This trades NUMA locality for\na guarantee that the work is actually serviced. sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - nfsd is the in-kernel NFS server; inbound TCP/UDP/RDMA traffic hits svc_tcp_listen_data_ready/svc_data_ready then svc_xprt_enqueue() and svc_pool_for_cpu() before any RPC decode, so a remote peer reaches the bug over the wire.\nAC:L - On NUMA nfsd hosts using pernode/percpu pools with fewer threads than pools, a remote peer can open connections or send datagrams until RSS/softirq lands the listener or shared UDP xprt on an empty pool; the attacker controls that fan-out and no race or layout luck is required.\nPR:N - Enqueue runs in the socket data_ready path on the first TCP connect or UDP datagram to nfsd, before RPC parsing or AUTH_SYS/RPCSEC_GSS, so an unauthenticated network peer needs no local account or capability.\nUI:N - No victim action is required; an already-running NFS server automatically processes inbound connections and packets through the sunrpc transport callbacks.\nS:U - The hang is confined to the host kernel\u0027s sunrpc/nfsd threads and sockets and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a transport-scheduling hang with no memory corruption, out-of-bounds access, or other primitive that could disclose kernel or file data.\nI:N - A transport stuck on a threadless pool is never serviced, so RPC operations are not executed and no kernel or filesystem state is modified.\nA:H - A transport enqueued on a threadless pool stays XPT_BUSY and is never dequeued; aging skips busy sockets, so a stuck listener or shared UDP xprt permanently stops NFS accept/recv until nfsd restarts."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:48:42.059Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"
},
{
"url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"
},
{
"url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"
},
{
"url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"
},
{
"url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"
},
{
"url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"
},
{
"url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"
},
{
"url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"
}
],
"title": "sunrpc: route to a populated pool in svc_pool_for_cpu()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89549",
"datePublished": "2026-09-11T19:44:23.928Z",
"dateReserved": "2026-09-11T19:38:34.723Z",
"dateUpdated": "2026-10-19T08:48:42.059Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.