CVE-2026-80811

Kernel memory exhaustion via leaked io_uring iovecs

Published Sep 4, 2026 · Updated Sep 4, 2026

Memory leak in Linux kernel 6.15 allows local users to consume kernel memory through asynchronous NVMe passthrough commands. The io_uring_cmd_prep function fails to mark a reused iovec for cleanup, while io_req_uring_cleanup leaves the vector allocated when the 128-entry command cache rejects it. Reaching both paths requires access to io_uring NVMe passthrough and enough concurrent commands to exceed the cache, after which leaked allocations accumulate.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Linux kernel 6.15 allows local users to consume kernel memory through asynchronous NVMe passthrough commands. The io_uring_cmd_prep function fails to mark a reused iovec for cleanup, while io_req_uring_cleanup leaves the vector allocated when the 128-entry command cache rejects it. Reaching both paths requires access to io_uring NVMe passthrough and enough concurrent commands to exceed the cache, after which leaked allocations accumulate.

The record

CVE
CVE-2026-80811
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=3a4689ac109f18f23ea0d0c1c79e055142796858 <7068d3587a64a24943a7c9e232976da2c9e0e303
  2. Affected versionversion=3a4689ac109f18f23ea0d0c1c79e055142796858 <b290de4d16d75b6c1ef42025b47f5d94eb1ec09f
  3. Affected versionversion=3a4689ac109f18f23ea0d0c1c79e055142796858 <b6a768aa975b9ca81b92f028bdd975d1f8237894
  4. Affected versionversion=3a4689ac109f18f23ea0d0c1c79e055142796858 <bb34ae5da3365699d53a756f4c96b6ea9f8ba0c1
  5. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3a4689ac109f18f23ea0d0c1c79e055142796858 <7068d3587a64a24943a7c9e232976da2c9e0e303; version=3a4689ac109f18f23ea0d0c1c79e055142796858 <b290de4d16d75b6c1ef42025b47f5d94eb1ec09f; version=3a4689ac109f18f23ea0d0c1c79e055142796858 <b6a768aa975b9ca81b92f028bdd975d1f8237894; version=3a4689ac109f18f23ea0d0c1c79e055142796858 <bb34ae5da3365699d53a756f4c96b6ea9f8ba0c1; version=6.15

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

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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