s390/ism: Fix UAF of sba and ieq during ism_dev_exit()
CVE-2026-74690 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 8.4 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74690?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to < 950dac9e8c4e3cf68fa8c01f77d3ac3b7369c6a9, 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to < 58803870ba0841e53b630a1290c6838b091dd128, 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to < fc3021284050ecb3bba8a7851340cedcb5037928, 684b89bc39ce4f204b1a2b180f39f2eb36a6b695 to < 774394d27930ec4cf4cb3eed8ab6a4d20cb2430a
- Linux Linux: 4.19
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/950dac9e8c4e3cf68fa8c01f77d3ac3b7369c6a9
- git.kernel.org/stable/c/58803870ba0841e53b630a1290c6838b091dd128
- git.kernel.org/stable/c/fc3021284050ecb3bba8a7851340cedcb5037928
- git.kernel.org/stable/c/774394d27930ec4cf4cb3eed8ab6a4d20cb2430a
- git.kernel.org/stable/c/b1896543ce59c4258625a35cf41e23a9a1f80ea2
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON