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Review reviewCritical

CVE-2023-54184

Linux

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsit: Free cmds before session free Commands from recovery entries are freed after session has been closed. That leads to use-after-free at command free or NPE with such call trace: Time2Retain timer expired for SID: 1, cleaning up iSCSI session. BUG: kernel NULL pointer dereference, address: 0000000000000140 RIP: 0010:sbitmap_queue_clear+0x3a/0xa0 Call Trace: target_release_cmd_kref+0xd1/0x1f0 [target_core_mod] transport_generic_free_cmd+0xd1/0x180 [target_core_mod] iscsit_free_cmd+0x53/0xd0 [iscsi_target_m...

CVSS
9.8
EPSS
0.50%
39.8% percentile
CISA KEV
Not listed
Published
2025.12.30
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.50%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsit: Free cmds before session free Commands from recovery entries are freed after session has been closed. That leads to use-after-free at command free or NPE with such call trace: Time2Retain timer expired for SID: 1, cleaning up iSCSI session. BUG: kernel NULL pointer dereference, address: 0000000000000140 RIP: 0010:sbitmap_queue_clear+0x3a/0xa0 Call Trace: target_release_cmd_kref+0xd1/0x1f0 [target_core_mod] transport_generic_free_cmd+0xd1/0x180 [target_core_mod] iscsit_free_cmd+0x53/0xd0 [iscsi_target_m...

Affected product and versions

Product
Linux
Affected versions
>= 988e3a85463d9b6dabc681df3f8f131b23c19953 < 89f5055f9b0b57c7e7f02e32df95ef401f809b71, >= 988e3a85463d9b6dabc681df3f8f131b23c19953 < 4621e24c9257c6379343bf0c11b473817cf7edcd, >= 988e3a85463d9b6dabc681df3f8f131b23c19953 < 1911cca5916b6e106de7afa3ec0a38447158216c, >= 988e3a85463d9b6dabc681df3f8f131b23c19953 < a7a4def6c7046e090bb10c6d550fdeb487db98ba, >= 988e3a85463d9b6dabc681df3f8f131b23c19953 < 4ce221d295f53e6c6b835ab33181e735482c9aac, >= 988e3a85463d9b6dabc681df3f8f131b23c19953 < d8990b5a4d065f38f35d69bcd627ec5a7f8330ca, >= 3.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available