VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource GCVE Database

Authoritative record:CVE-2026-89527

Not known to be exploited.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-h2xv-x4xq-mhh8

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected 6.17.0-5.5 – 7.0.0-38.38 23 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1017.17 15 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1016.16 9 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1014.14 13 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected 7.0.0-1002.3 – 7.0.0-1008.9 6 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available that replaces the improper kfree() call with svc_xprt_put() and balances module reference counting with a compensating __module_get(). Users should apply the official Linux kernel updates that include this patch to ensure proper resource cleanup and avoid potential resource management issues.

Description

A vulnerability in the Linux kernel's svcrdma component was resolved by correcting the resource cleanup process when listener creation fails. The issue involved improper freeing of resources leading to potential reference count imbalances and incomplete cleanup. The fix replaces a direct memory free call with a proper reference decrement function to ensure correct cleanup and module reference counting.

Impact

The vulnerability could cause improper resource cleanup and reference count imbalances in the svcrdma subsystem of the Linux kernel, potentially leading to resource leaks or instability. There is no indication of direct exploitation or active attacks. The impact is primarily on kernel resource management correctness.

Summary

The Linux kernel svcrdma vulnerability involved the svc_rdma_create() function calling kfree(cma_xprt) upon failure of svc_rdma_create_listen_id(), bypassing svc_xprt_free() which handles releasing a net namespace reference acquired earlier. This improper cleanup could lead to resource management issues. The patch replaces kfree() with svc_xprt_put() to correctly drop the reference count and trigger svc_xprt_free(), which in turn calls svc_rdma_free() for proper cleanup. Additionally, a compensating __module_get() call was added to balance module reference counting, preventing double module_put() calls. This fix ensures proper resource and module reference management on error paths.

References

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