VulnerabilityPublished 28 Oct 2026

CVE-2026-99166: Linux kernel · net: rds: fix uninitialized trans dereference in CM event handler

Source GCVE Database

Authoritative record:CVE-2026-99166

Not known to be exploited · fixed in ca14c289ed9ffed6cc64290d039e923e5720a8bf : patch Linux kernel soon.

Data as of 28 Oct 2026, 13:57 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in ca14c289ed9ffed6cc64290d039e923e5720a8bf, 492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8, 5f23e4e3a31dacfd82a8f56be253adc0910ee84f

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 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-6552-7g22-4qf3

What to do

Upgrade Linux kernel to ca14c289ed9ffed6cc64290d039e923e5720a8bf, 492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8 or 5f23e4e3a31dacfd82a8f56be253adc0910ee84f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ dcdede0406d30e14a6ed727dce69dfac0518371d, < ca14c289ed9ffed6cc64290d039e923e5720a8bf	Fixed in ca14c289ed9ffed6cc64290d039e923e5720a8bf
LinuxLinux	Affected ≥ dcdede0406d30e14a6ed727dce69dfac0518371d, < 492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8	Fixed in 492ba6ac1b1ffb8a06ff52db0825c1af2cdb28c8
LinuxLinux	Affected ≥ dcdede0406d30e14a6ed727dce69dfac0518371d, < 5f23e4e3a31dacfd82a8f56be253adc0910ee84f	Fixed in 5f23e4e3a31dacfd82a8f56be253adc0910ee84f
LinuxLinux	Affected =4.6	Fixed in–
Red Hatredhat/kernel`pkg:rpm/redhat/kernel`Other threats	Affected =4.6	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 initializes the trans pointer to the InfiniBand transport by default and rejects connection requests on non-IB RDMA devices. Users should apply the official Linux kernel patch that addresses this issue. Until patched, avoid using RDS over non-InfiniBand RDMA devices to prevent kernel crashes.

Description

A vulnerability in the Linux kernel's RDS subsystem involves an uninitialized pointer dereference in the RDMA CM event handler. Specifically, the trans pointer is only assigned for InfiniBand devices but remains uninitialized for other RDMA device types like iWARP, leading to kernel crashes upon connection requests. The issue causes null pointer dereferences and kernel oopses when handling connection events on non-InfiniBand devices.

Impact

An RDS listener on a non-InfiniBand RDMA device (e.g., iWARP) crashes the Linux kernel upon receiving a connection request due to dereferencing an uninitialized pointer. This results in a kernel oops and potential denial of service. The issue affects kernel stability when using RDS over non-IB RDMA devices. There is no indication of code execution or privilege escalation, but the crash disrupts normal operation.

References

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