CVE-2026-92511

Host crash via RDMA completion-queue lifetime race

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in Linux RDMA completion-queue teardown in affected branches from 4.16 allows local users to crash the host via a race. ib_destroy_cq_user removes a queue from restrack only after vendor resources are freed, so a concurrent netlink lookup can retain and access stale queue state. An unprivileged account and an RDMA device are required; successful races can read or corrupt freed kernel memory or panic the host.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux RDMA completion-queue teardown in affected branches from 4.16 allows local users to crash the host via a race. ib_destroy_cq_user removes a queue from restrack only after vendor resources are freed, so a concurrent netlink lookup can retain and access stale queue state. An unprivileged account and an RDMA device are required; successful races can read or corrupt freed kernel memory or panic the host.

The record

CVE
CVE-2026-92511
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=08f294a1524bc3211a28091daa6c7513828c7d33 <197c262dbf94c0f7ab7ac54b66f892ce9f343232
  2. Affected versionversion=08f294a1524bc3211a28091daa6c7513828c7d33 <253c2ed71a532c70fa0e64317ceb02bb1a50c84c
  3. Affected versionversion=08f294a1524bc3211a28091daa6c7513828c7d33 <3481bec4dfc4aee24ffea5a547ee95b70b67d9d5
  4. Affected versionversion=08f294a1524bc3211a28091daa6c7513828c7d33 <42f7a0c7a94003059540cce448acabfa62ad119d
  5. Affected versionversion=08f294a1524bc3211a28091daa6c7513828c7d33 <8a72a6aad84b3928dbb5e564bff1f56a7ec222ae
  6. Affected versionversion=08f294a1524bc3211a28091daa6c7513828c7d33 <b85a148731eceffacb6a030950187d785175607f
  7. Affected versionversion=4.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=08f294a1524bc3211a28091daa6c7513828c7d33 <197c262dbf94c0f7ab7ac54b66f892ce9f343232; version=08f294a1524bc3211a28091daa6c7513828c7d33 <253c2ed71a532c70fa0e64317ceb02bb1a50c84c; version=08f294a1524bc3211a28091daa6c7513828c7d33 <3481bec4dfc4aee24ffea5a547ee95b70b67d9d5; version=08f294a1524bc3211a28091daa6c7513828c7d33 <42f7a0c7a94003059540cce448acabfa62ad119d; version=08f294a1524bc3211a28091daa6c7513828c7d33 <8a72a6aad84b3928dbb5e564bff1f56a7ec222ae; version=08f294a1524bc3211a28091daa6c7513828c7d33 <b85a148731eceffacb6a030950187d785175607f; version=4.16

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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