CVE-2023-54184 (GCVE-0-2023-54184)
Vulnerability from cvelistv5
Published
2025-12-30 12:08
Modified
2026-08-05 09:17
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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_mod] iscsit_free_connection_recovery_entries+0x29d/0x320 [iscsi_target_mod] iscsit_close_session+0x13a/0x140 [iscsi_target_mod] iscsit_check_post_dataout+0x440/0x440 [iscsi_target_mod] call_timer_fn+0x24/0x140 Move cleanup of recovery enrties to before session freeing.
References
Impacted products
Vendor Product Version
Linux Linux Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
Version: 988e3a85463d9b6dabc681df3f8f131b23c19953
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/target/iscsi/iscsi_target.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/target/iscsi/iscsi_target.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.4.244",
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            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.181",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.244",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.181",
                  "versionStartIncluding": "3.12",
                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsit: Free cmds before session free\n\nCommands from recovery entries are freed after session has been closed.\nThat leads to use-after-free at command free or NPE with such call trace:\n\nTime2Retain timer expired for SID: 1, cleaning up iSCSI session.\nBUG: kernel NULL pointer dereference, address: 0000000000000140\nRIP: 0010:sbitmap_queue_clear+0x3a/0xa0\nCall Trace:\n target_release_cmd_kref+0xd1/0x1f0 [target_core_mod]\n transport_generic_free_cmd+0xd1/0x180 [target_core_mod]\n iscsit_free_cmd+0x53/0xd0 [iscsi_target_mod]\n iscsit_free_connection_recovery_entries+0x29d/0x320 [iscsi_target_mod]\n iscsit_close_session+0x13a/0x140 [iscsi_target_mod]\n iscsit_check_post_dataout+0x440/0x440 [iscsi_target_mod]\n call_timer_fn+0x24/0x140\n\nMove cleanup of recovery enrties to before session freeing."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The LIO in-kernel iSCSI target (drivers/target/iscsi) serves remote initiators over TCP/3260, and the entire trigger sequence \u2014 ERL=2 login negotiation, issuing SCSI commands, and dropping the connection to strand them in a recovery entry \u2014 is performed purely with network PDUs from a remote peer.\nAC:L - The free-then-use ordering in iscsit_close_session() is unconditional, not a race, so a remote initiator deterministically reaches it by negotiating ErrorRecoveryLevel=2, leaving commands outstanding, and dropping the TCP connection until the Time2Retain timer expires; connection-recovery (default_erl=2) is a supported deployment configuration, i.e. part of the vulnerable configuration rather than a condition outside the attacker\u0027s control.\nPR:N - iscsi_conn_auth_required() defers entirely to the TPG/ACL authentication attribute, and iSCSI targets are routinely deployed with authentication disabled and/or generate_node_acls=1 (demo mode), letting any host that can reach TCP/3260 establish a normal session with no credentials whatsoever.\nUI:N - No action by any local user or administrator is needed; the attacker drives session setup, connection failure, and the Time2Retain expiry entirely from the network.\nS:U - The use-after-free corrupts kernel memory within the same security authority as the vulnerable kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - iscsit_free_cmd() dereferences struct iscsit_cmd objects living inside the kvfree\u0027d sess_cmd_map and the freed se_sess, so contents of reallocated kernel memory are read back and acted upon; an attacker who reclaims that region with sprayed iSCSI data gains a controlled read/disclosure primitive.\nI:H - The UAF writes into freed memory (list_del_init on datain/r2t lists, cmd-\u003econn = NULL, spinlock acquisition, sbitmap_queue_clear into the freed tag pool) and performs kfree() on cmd-\u003ebuf_ptr and cmd-\u003epdu_list pointers read out of freed memory, yielding arbitrary-free and heap-corruption primitives suitable for control-flow hijacking.\nA:H - The reported failure is a kernel NULL pointer dereference in sbitmap_queue_clear() from call_timer_fn() (softirq context), an immediate oops/panic that a remote attacker can trigger repeatedly by opening and abandoning sessions."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:17:52.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/89f5055f9b0b57c7e7f02e32df95ef401f809b71"
        },
        {
          "url": "https://git.kernel.org/stable/c/4621e24c9257c6379343bf0c11b473817cf7edcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/1911cca5916b6e106de7afa3ec0a38447158216c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7a4def6c7046e090bb10c6d550fdeb487db98ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ce221d295f53e6c6b835ab33181e735482c9aac"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8990b5a4d065f38f35d69bcd627ec5a7f8330ca"
        }
      ],
      "title": "scsi: target: iscsit: Free cmds before session free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54184",
    "datePublished": "2025-12-30T12:08:54.528Z",
    "dateReserved": "2025-12-30T12:06:44.497Z",
    "dateUpdated": "2026-08-05T09:17:52.229Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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