7.5

CVE-2026-89549: linux

CVSS: 7.5v3.1HighReceived
AliasesUBUNTU-CVE-2026-89549DEBIAN-CVE-2026-89549
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-89549 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0506OPENSUSE-SU-2026:11880-1

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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().

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

-0.01 pp

From 0.72% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < 9accc25e5af0bac8479f6054e674b2c593c45281 | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < 6f66d38e2a6c78d48723ea17ad86135ec80ca24b | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < edb20e8c03aebacb409968c99d046f509c6c485a | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < 011479cf9a7657d4a3e7cc42a784ac63df594170 | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < 9d04d64ad192439835ed9884d767353061c3ed6f | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < 8f766d2d0b4dabf54f8b35812df2b4f481d13316 | ≥ bfd241600a3b0db4fe43c859f1460d0a958d924a, < f6310491c4cdb88af73aa551ec9df1f10a90c709 | 2.6.19

3 vendors · 172 products

References

13 links
Show all 13 references