VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-92509: Linux kernel · RDMA/core: Fix potential use after free in counter_release()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d5cc211e8c39e46f357d30a092d683e84d560de9 : 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: 0.1% 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 d5cc211e8c39e46f357d30a092d683e84d560de9, 235ef2d0e750885c29340b0fc40620a7a4f52e12, 64c72390d8407ea86de712a477c796b07d37abc4 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 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 ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < d5cc211e8c39e46f357d30a092d683e84d560de9	Fixed in d5cc211e8c39e46f357d30a092d683e84d560de9
LinuxLinux	Affected ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < 235ef2d0e750885c29340b0fc40620a7a4f52e12	Fixed in 235ef2d0e750885c29340b0fc40620a7a4f52e12
LinuxLinux	Affected ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < 64c72390d8407ea86de712a477c796b07d37abc4	Fixed in 64c72390d8407ea86de712a477c796b07d37abc4
LinuxLinux	Affected ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < 8c013e3a8d8273da4d47bf1c27f016a3551996f5	Fixed in 8c013e3a8d8273da4d47bf1c27f016a3551996f5
LinuxLinux	Affected ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < 5eb0c57a8b568eb08f464861d84d518a2af939ac	Fixed in 5eb0c57a8b568eb08f464861d84d518a2af939ac
LinuxLinux	Affected ≥ 99fa331dc8629be55ac7a0cca0dc56492070ddac, < 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b	Fixed in 2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in counter_release() When accessing a counter via the netlink path the only synchronization mechanism for the said counter is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of counter_release(), which is too late, since by that point vendor-specific resources associated with the counter might already be freed. This can leave a short window where the counter remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources, ensuring that the counter is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a counter that is in the process of destruction.

References

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