CVE-2026-90415

Resource exhaustion via failed-write STAG index leak

Published Sep 17, 2026 · Updated Sep 17, 2026

Resource leakage in Linux RDMA/cxgb4 allows local users to exhaust STAG indices through failed adapter-memory writes. The write_tpt_entry() function allocates an index but does not release it when write_adapter_mem() fails; no memory region is registered for deregistration to reclaim it. Exposure requires the cxgb4 RDMA driver and failed adapter writes; leaked indices persist until device teardown and prevent further allocations when the pool is exhausted.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in Linux RDMA/cxgb4 allows local users to exhaust STAG indices through failed adapter-memory writes. The write_tpt_entry() function allocates an index but does not release it when write_adapter_mem() fails; no memory region is registered for deregistration to reclaim it. Exposure requires the cxgb4 RDMA driver and failed adapter writes; leaked indices persist until device teardown and prevent further allocations when the pool is exhausted.

The record

CVE
CVE-2026-90415
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5
  2. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <2f17ca7ab5269ac2504e1039c3921373dccd7712
  3. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <5a21e5114cec4cd3f8a2843d4c46bc49634d6e96
  4. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <5fe4731bfbd8d83c4a14b4af3a27329969ce8a99
  5. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <8f6976d635d190e3d7af7103daaa581cf1ccc12e
  6. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <9eeafcda1d6c11f0eec532243c4e96ec8c632bd7
  7. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <a2e37d1ab773be3cd26b1c19593ca2dbcece9c57
  8. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <a64e2beb450179a5d43034af8d5476a11eac1486
  9. Affected versionversion=ec3eead217181d7360a11317a888ceb30807867c <fdfb5cea4bf070cdb31d997efd87bb684df041fd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=ec3eead217181d7360a11317a888ceb30807867c <2f17ca7ab5269ac2504e1039c3921373dccd7712; version=ec3eead217181d7360a11317a888ceb30807867c <5a21e5114cec4cd3f8a2843d4c46bc49634d6e96; version=ec3eead217181d7360a11317a888ceb30807867c <5fe4731bfbd8d83c4a14b4af3a27329969ce8a99; version=ec3eead217181d7360a11317a888ceb30807867c <8f6976d635d190e3d7af7103daaa581cf1ccc12e; version=ec3eead217181d7360a11317a888ceb30807867c <9eeafcda1d6c11f0eec532243c4e96ec8c632bd7; version=ec3eead217181d7360a11317a888ceb30807867c <a2e37d1ab773be3cd26b1c19593ca2dbcece9c57; version=ec3eead217181d7360a11317a888ceb30807867c <a64e2beb450179a5d43034af8d5476a11eac1486; version=ec3eead217181d7360a11317a888ceb30807867c <fdfb5cea4bf070cdb31d997efd87bb684df041fd

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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