CVE-2026-90324

Unspecified impact via uninitialized ublk iterator

Published Sep 17, 2026 · Updated Sep 18, 2026

Uninitialized data use in Linux 6.5 and later affected branches allows local users to cause unspecified impact through a userspace ublk server. The ublk_map_io and ublk_unmap_io paths ignored import_ubuf() failures and passed an uninitialized iov_iter to ublk_copy_user_pages(). Reachability requires control of a ublk server and an out-of-range user address; the upstream notice does not state the resulting security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized data use in Linux 6.5 and later affected branches allows local users to cause unspecified impact through a userspace ublk server. The ublk_map_io and ublk_unmap_io paths ignored import_ubuf() failures and passed an uninitialized iov_iter to ublk_copy_user_pages(). Reachability requires control of a ublk server and an out-of-range user address; the upstream notice does not state the resulting security consequence.

The record

CVE
CVE-2026-90324
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

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=6.5
  2. Affected versionversion=981f95a571e3ca20a496c0b77dbf6b06039c6648 <0121c84adb6a4cd6f7560b5895bd88f9899bbc1f
  3. Affected versionversion=981f95a571e3ca20a496c0b77dbf6b06039c6648 <3831568792af75b6523fa93bb91560e29189cf55
  4. Affected versionversion=981f95a571e3ca20a496c0b77dbf6b06039c6648 <5ac6019cb78e98c9608fda72726b36ddf8474dd7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=981f95a571e3ca20a496c0b77dbf6b06039c6648 <0121c84adb6a4cd6f7560b5895bd88f9899bbc1f; version=981f95a571e3ca20a496c0b77dbf6b06039c6648 <3831568792af75b6523fa93bb91560e29189cf55; version=981f95a571e3ca20a496c0b77dbf6b06039c6648 <5ac6019cb78e98c9608fda72726b36ddf8474dd7

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.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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