CVE-2026-74690

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

State: Published
Severity: 8.4 High
Published: Aug 22, 2026
Updated: Oct 30, 2026
Reserved: Aug 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.4 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 9c9a59603b2b016424fe2f9a1cb58c8c2f7198f4Affected 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 950dac9e8c4e3cf68fa8c01f77d3ac3b7369c6a9Affected 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 58803870ba0841e53b630a1290c6838b091dd128Affected 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before fc3021284050ecb3bba8a7851340cedcb5037928Affected 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 774394d27930ec4cf4cb3eed8ab6a4d20cb2430aAffected 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before b1896543ce59c4258625a35cf41e23a9a1f80ea2Affected
LinuxLinux	4.19Affected before 4.19Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 9c9a59603b2b016424fe2f9a1cb58c8c2f7198f4Affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 950dac9e8c4e3cf68fa8c01f77d3ac3b7369c6a9Affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 58803870ba0841e53b630a1290c6838b091dd128Affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before fc3021284050ecb3bba8a7851340cedcb5037928Affected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before 774394d27930ec4cf4cb3eed8ab6a4d20cb2430aAffected
684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to before b1896543ce59c4258625a35cf41e23a9a1f80ea2Affected

LinuxLinux

4.19Affected
before 4.19Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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