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 CVE Database V5

Not known to be exploited · fixed in ee70d690b5544b736706a9a5796aafb634013f54 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

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.
Patch: Available – fixed in ee70d690b5544b736706a9a5796aafb634013f54, e68380710fc970e07610b2f42594575ad35fdb1c, e346ef7bcb137f50c49f969330ab7dcf64ea1654 +2

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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 4fb8518bdac8e85f6580ea3f586adf396cd472bc, < ee70d690b5544b736706a9a5796aafb634013f54	Fixed in ee70d690b5544b736706a9a5796aafb634013f54
LinuxLinux	Affected ≥ 4fb8518bdac8e85f6580ea3f586adf396cd472bc, < e68380710fc970e07610b2f42594575ad35fdb1c	Fixed in e68380710fc970e07610b2f42594575ad35fdb1c
LinuxLinux	Affected ≥ 4fb8518bdac8e85f6580ea3f586adf396cd472bc, < e346ef7bcb137f50c49f969330ab7dcf64ea1654	Fixed in e346ef7bcb137f50c49f969330ab7dcf64ea1654
LinuxLinux	Affected ≥ 4fb8518bdac8e85f6580ea3f586adf396cd472bc, < ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6	Fixed in ac1dd6002f758ab7dd3e737757e5a1bb1c0b38d6
LinuxLinux	Affected ≥ 4fb8518bdac8e85f6580ea3f586adf396cd472bc, < 2e35ec558b8cece9399a50141ecaeadbdb8768dc	Fixed in 2e35ec558b8cece9399a50141ecaeadbdb8768dc
LinuxLinux	Affected =2.6.37	Fixed in–

Description

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.

References

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