CVE-2026-89549

CVE CVE-2026-89549EUVD EUVD-2026-76460Published 2026-09-11T19:44:23.000ZLast changed 2026-09-14T12:00:52.000ZCVSS 7.5

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 6.18.50; bfd241600a3b0db4fe43c859f1460d0a958d924a <8f766d2d0b4dabf54f8b35812df2b4f481d13316; bfd241600a3b0db4fe43c859f1460d0a958d924a <edb20e8c03aebacb409968c99d046f509c6c485a; bfd241600a3b0db4fe43c859f1460d0a958d924a <9d04d64ad192439835ed9884d767353061c3ed6f; patch: 6.12.109; patch: 7.2.4; patch: 5.15.221; patch: 7.3-rc1; 2.6.19; patch: 0; patch: 6.1.188; bfd241600a3b0db4fe43c859f1460d0a958d924a <011479cf9a7657d4a3e7cc42a784ac63df594170; patch: 5.10.270; bfd241600a3b0db4fe43c859f1460d0a958d924a <6f66d38e2a6c78d48723ea17ad86135ec80ca24b; bfd241600a3b0db4fe43c859f1460d0a958d924a <f6310491c4cdb88af73aa551ec9df1f10a90c709; bfd241600a3b0db4fe43c859f1460d0a958d924a <d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f; patch: 6.6.157; bfd241600a3b0db4fe43c859f1460d0a958d924a <9accc25e5af0bac8479f6054e674b2c593c45281

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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