{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54184", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.497Z", "datePublished": "2025-12-30T12:08:54.528Z", "dateUpdated": "2026-08-05T09:17:52.229Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:52.229Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "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 — ERL=2 login negotiation, issuing SCSI commands, and dropping the connection to strand them in a recovery entry — 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's 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'd 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->conn = NULL, spinlock acquisition, sbitmap_queue_clear into the freed tag pool) and performs kfree() on cmd->buf_ptr and cmd->pdu_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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/iscsi/iscsi_target.c" ], "versions": [ { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "89f5055f9b0b57c7e7f02e32df95ef401f809b71", "status": "affected", "versionType": "git" }, { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "4621e24c9257c6379343bf0c11b473817cf7edcd", "status": "affected", "versionType": "git" }, { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "1911cca5916b6e106de7afa3ec0a38447158216c", "status": "affected", "versionType": "git" }, { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "a7a4def6c7046e090bb10c6d550fdeb487db98ba", "status": "affected", "versionType": "git" }, { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "4ce221d295f53e6c6b835ab33181e735482c9aac", "status": "affected", "versionType": "git" }, { "version": "988e3a85463d9b6dabc681df3f8f131b23c19953", "lessThan": "d8990b5a4d065f38f35d69bcd627ec5a7f8330ca", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/iscsi/iscsi_target.c" ], "versions": [ { "version": "3.12", "status": "affected" }, { "version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.244", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.181", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.113", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.4.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.10.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.15.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.1.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.3.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.4" } ] } ] } ], "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" } } } }