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VulnerabilityPublished Updated

CVE-2026-97477: Linux kernel · RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind()

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Authoritative record:CVE-2026-97477· Medium

Not known to be exploited · fixed in da95cb016812c0e012ea839f191926e35ca8f57f : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:52 UTC

Severity
Medium

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

Thin evidence

One scorer or none
Patch
Available – fixed in da95cb016812c0e012ea839f191926e35ca8f57f, 4517686789b404827591c52f79e9a57822371ca0, 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < da95cb016812c0e012ea839f191926e35ca8f57f
Fixed in
  • da95cb016812c0e012ea839f191926e35ca8f57f
LinuxLinuxAffected
  • ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 4517686789b404827591c52f79e9a57822371ca0
Fixed in
  • 4517686789b404827591c52f79e9a57822371ca0
LinuxLinuxAffected
  • ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a
Fixed in
  • 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a
LinuxLinuxAffected
  • ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd
Fixed in
  • 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd
LinuxLinuxAffected
  • ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 1bcdeddddffadff9993657f6b0e5535d66ebd10f
Fixed in
  • 1bcdeddddffadff9993657f6b0e5535d66ebd10f
LinuxLinuxAffected
  • =5.11
Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to properly decrement num_counters on bind_qp failure and restore port state. Users should apply the official kernel update that includes this fix once available. No other mitigation actions are indicated.

Description

A resource leak vulnerability in the Linux kernel's RDMA counter subsystem was fixed. The issue occurs when __rdma_counter_bind_qp() fails during alloc_and_bind(), causing a leak of the num_counters counter due to improper error handling. This leak accumulates with repeated failures, preventing the port from switching to AUTO mode and blocking mode reversion, which can affect port state management.

References

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