CVE-2026-89549sunrpc: route to a populated pool in svc_pool_for_cpu()
- 7.5HighCVSS base score
- 0.71%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < 9accc25e5af0bac8479f6054e674b2c593c45281
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < 6f66d38e2a6c78d48723ea17ad86135ec80ca24b
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < edb20e8c03aebacb409968c99d046f509c6c485a
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < 011479cf9a7657d4a3e7cc42a784ac63df594170
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < 9d04d64ad192439835ed9884d767353061c3ed6f
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < 8f766d2d0b4dabf54f8b35812df2b4f481d13316
- affected bfd241600a3b0db4fe43c859f1460d0a958d924a – < f6310491c4cdb88af73aa551ec9df1f10a90c709
- affected 2.6.19
- unaffected < 2.6.19
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281 (opens in a new tab)
- https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b (opens in a new tab)
- https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f (opens in a new tab)
- https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a (opens in a new tab)
- https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170 (opens in a new tab)
- https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f (opens in a new tab)
- https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316 (opens in a new tab)
- https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76460 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89549)Record last updated .