ublk: check import_ubuf() return value

Answer in brief

CVE-2026-90324 records a Unknown severity vulnerability in ublk: check import_ubuf() return value. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=981f95a571e3ca20a496c0b77dbf6b06039c6648 <0121c84adb6a4cd6f7560b5895bd88f9899bbc1f \|\| >=981f95a571e3ca20a496c0b77dbf6b06039c6648 <5ac6019cb78e98c9608fda72726b36ddf8474dd7 \|\| >=981f95a571e3ca20a496c0b77dbf6b06039c6648 <3831568792af75b6523fa93bb91560e29189cf55	0121c84adb6a4cd6f7560b5895bd88f9899bbc1f, 5ac6019cb78e98c9608fda72726b36ddf8474dd7, 3831568792af75b6523fa93bb91560e29189cf55
Linux/Linuxgeneric	6.5	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0121c84adb6a4cd6f7560b5895bd88f9899bbc1f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ublk: check import_ubuf() return value import_ubuf() can fail if the address range (provided by the userspace ublk server) is outside the allowed user address space. Return that 0 bytes were copied if import_ubuf() fails rather than passing an uninitialized struct iov_iter to ublk_copy_user_pages().

Quoted source text, attributed separately from HOL analysis.