CVE-2026-74690
Use-after-free in Linux s390 ism driver allows kernel memory corruption on IBM Z.
Is CVE-2026-74690 being exploited?
Not confirmed. CVE-2026-74690 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2026-74690?
CVE-2026-74690 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74690?
Yes. A fix has been recorded for CVE-2026-74690. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74690 affect?
CVE-2026-74690 affects Linux kernel (s390 / IBM Z) - ism driver. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74690?
Install vendor/upstream kernel update and reboot to drain interrupts
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Concurrent interrupt-triggered UAF can corrupt kernel memory, causing DoS or local privilege escalation on s390 hosts.
Patch when possible
- affected>= 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 and < fc3021284050ecb3bba8a7851340cedcb5037928
- affected>= 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 and < 774394d27930ec4cf4cb3eed8ab6a4d20cb2430a
- affected>= 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 and < b1896543ce59c4258625a35cf41e23a9a1f80ea2
- affected4.19
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.