VulnerabilityPublished 24 Sep 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in da95cb016812c0e012ea839f191926e35ca8f57f, 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a, 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd +1

Exploitation evidence

Disclosed: evidence found.
CVE published 24 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 Linux kernel to da95cb016812c0e012ea839f191926e35ca8f57f, 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a, 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd or 1bcdeddddffadff9993657f6b0e5535d66ebd10f.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < da95cb016812c0e012ea839f191926e35ca8f57f	Fixed in da95cb016812c0e012ea839f191926e35ca8f57f
LinuxLinux	Affected ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a	Fixed in 7c9fee40fc8d8d928f44e99bc6e6adf93f9f2c2a
LinuxLinux	Affected ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd	Fixed in 4fbc8230009f5b1bcd13cc74c5a6a43ddba141fd
LinuxLinux	Affected ≥ 8bc205eff3056a9ed3850937cdd2192f05e6d3cb, < 1bcdeddddffadff9993657f6b0e5535d66ebd10f	Fixed in 1bcdeddddffadff9993657f6b0e5535d66ebd10f
LinuxLinux	Affected =5.11	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/counter: Fix num_counters leak on bind_qp failure in alloc_and_bind() When __rdma_counter_bind_qp() fails in alloc_and_bind(), the error path jumps to err_mode which frees the counter without decrementing port_counter->num_counters. The only place that decrements is rdma_counter_free(), which is unreachable since the counter was never successfully bound. This leak accumulates across repeated failures, permanently preventing the port from switching to AUTO mode (-EBUSY in __counter_set_mode()) and blocking the MANUAL→NONE auto-revert in rdma_counter_free(). When the mode was NONE before the call, the MANUAL mode set by __counter_set_mode() also leaks since the revert logic is never reached. Add an err_bind label between the num_counters increment and the existing err_mode label. It decrements num_counters and mirrors the MANUAL→NONE revert from rdma_counter_free(), ensuring the port state is fully restored on bind failure.

References

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