s390/ism: Fix UAF of sba and ieq during ism_dev_exit() (CVE-2026-74690) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74690

s390/ism: Fix UAF of sba and ieq during ism_dev_exit()

Answer in brief

CVE-2026-74690 records a Unknown severity vulnerability in s390/ism: Fix UAF of sba and ieq during ism_dev_exit(). 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 Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 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	>=684b89bc39ce4f204b1a2b180f39f2eb36a6b695 <fc3021284050ecb3bba8a7851340cedcb5037928 \|\| >=684b89bc39ce4f204b1a2b180f39f2eb36a6b695 <774394d27930ec4cf4cb3eed8ab6a4d20cb2430a \|\| >=684b89bc39ce4f204b1a2b180f39f2eb36a6b695 <b1896543ce59c4258625a35cf41e23a9a1f80ea2	fc3021284050ecb3bba8a7851340cedcb5037928, 774394d27930ec4cf4cb3eed8ab6a4d20cb2430a, b1896543ce59c4258625a35cf41e23a9a1f80ea2
Linux/Linuxgeneric	4.19	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to fc3021284050ecb3bba8a7851340cedcb5037928 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: s390/ism: Fix UAF of sba and ieq during ism_dev_exit() A ism interrupt handler can be active in parallel with ism_dev_exit(), accessing freed data structures. No new interrupts will be generated after unregister_ieq(). Drain ongoing interrupt handlers by free_irq(), before freeing ism data structures.

Quoted source text, attributed separately from HOL analysis.