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NVD / CVE Program· CNA Linux

CVE-2026-89527: svcrdma: Use svc_xprt_put to free listener on create failure

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 2e35ec558b8cece9399a50141ecaeadbdb8768dc, 31b8293495ba94ccf494e556a318886b716884b6, ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2e35ec558b8cece9399a50141ecaeadbdb8768dc, 31b8293495ba94ccf494e556a318886b716884b6, ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Use svc_xprt_put to free listener on create failure svc_rdma_create() calls kfree(cma_xprt) when svc_rdma_create_listen_id() fails. svc_xprt_init() has already acquired a net namespace reference via get_net_track(); kfree bypasses svc_xprt_free() which releases it. Replace the kfree() with svc_xprt_put() so the kref_init birth reference drops to zero and svc_xprt_free() dispatches svc_rdma_free() to clean up properly. sc_cm_id is still NULL at that point; the preceding patch added the necessary NULL guard in svc_rdma_free(). svc_xprt_free() also drops the module reference via module_put(), but the caller _svc_xprt_create() does the same on xpo_create failure, double-putting the single try_module_get() it acquired. Take a compensating __module_get() before the svc_xprt_put() to keep the count balanced, matching the convention in svc_rdma_accept()'s error path.

Published
Sep 11, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 13th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.37affected
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before 31b8293495ba94ccf494e556a318886b716884b6affected · git
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before 2e35ec558b8cece9399a50141ecaeadbdb8768dcaffected · git
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before ee70d690b5544b736706a9a5796aafb634013f54affected · git
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before e68380710fc970e07610b2f42594575ad35fdb1caffected · git
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6affected · git
    • 4fb8518bdac8e85f6580ea3f586adf396cd472bc and later · before e346ef7bcb137f50c49f969330ab7dcf64ea1654affected · git
    • before 2.6.37not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89525Sep 11, 2026 · udf: reject VAT indexes equal to the entry count
    0Monitor
  • ← EarlierCVE-2026-89526Sep 11, 2026 · svcrdma: Validate Read chunk positions before reconstruction
    39Monitor
  • Later →CVE-2026-89528Sep 11, 2026 · svcrdma: Reject Read lists that exceed the page budget
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2e35ec558b8cece9399a50141ecaeadbdb8768dcVendor (CNA)
Linux Linux31b8293495ba94ccf494e556a318886b716884b6Vendor (CNA)
Linux Linuxac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6Vendor (CNA)
Linux Linuxe346ef7bcb137f50c49f969330ab7dcf64ea1654Vendor (CNA)
Linux Linuxe68380710fc970e07610b2f42594575ad35fdb1cVendor (CNA)
Linux Linuxee70d690b5544b736706a9a5796aafb634013f54Vendor (CNA)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.6-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records