CVE-2026-23193

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

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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