GHSA-J6W6-QX29-46GG
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In 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().
{
"affected": [],
"aliases": [
"CVE-2026-89549"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:38Z",
"severity": "HIGH"
},
"details": "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().",
"id": "GHSA-j6w6-qx29-46gg",
"modified": "2026-09-14T15:32:28Z",
"published": "2026-09-11T21:31:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89549"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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