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CVE Record

CVE-2026-23193: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()

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.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A race in the Linux kernel’s iSCSI target session cleanup can access a session after it has been freed. This may crash the system or potentially compromise confidentiality and integrity, as reflected by the supplied CVSS assessment. The sources do not establish remote code execution or real-world exploitation.

Executive priority

Treat as a high-priority update for exposed or business-critical iSCSI target servers. Other Linux systems should first be checked for use of the affected subsystem. Accelerate remediation where storage availability is important, but do not characterize this as actively exploited based on the supplied evidence.

Technical view

iscsit_dec_session_usage_count() called complete() while holding session_usage_lock. The awakened release waiter could immediately free iscsit_session, leaving the original thread to call spin_unlock_bh() through freed memory. The fix releases the lock before signaling completion, ensuring session dereferences finish before deallocation can proceed.

Likely exposure

Exposure is most likely on Linux systems using the kernel iSCSI target functionality. The CVSS vector describes network reachability, low complexity, low privileges, and no user interaction. The supplied version data is ambiguous and should not be used alone to determine whether a distribution kernel is vulnerable.

Exploitation context

The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit. KASAN detected the slab use-after-free. Although CVSS 8.8 models high confidentiality, integrity, and availability impact, the sources do not demonstrate reliable exploitation beyond triggering the race.

Researcher notes

The vulnerable ordering permits completion wake-up before the current thread has finished using sess. Stable fixes reorder operations so spin_unlock_bh() occurs before complete(). Seven kernel.org commits are supplied, apparently covering stable branches, but the bundle does not map each commit to a specific version or distribution package.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable fix for your kernel branch.
  • Prioritize systems providing iSCSI target services, especially those reachable by untrusted or minimally privileged clients.
  • Restrict iSCSI target network access and credentials while awaiting the appropriate kernel update.
  • Check Linux distribution advisories for exact package versions and reboot requirements.

Validation and detection

  • Inventory systems configured to provide Linux kernel iSCSI target services.
  • Compare each running kernel package against its distribution’s CVE advisory or fixed package version.
  • Confirm the applicable stable fix is present in vendor changelogs or kernel source history.
  • After updating, verify the fixed kernel is running and iSCSI services operate normally.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-23193 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-23193Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxe48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01, e48354ce078c079996f89d715dfa44814b4eba01unaffected
LinuxLinux3.1, 0, 5.10.250, 5.15.200, 6.1.163, 6.6.124, 6.12.70, 6.18.10, 6.19affected
Weakness

CWE details

No CWE listed

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