{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-99153", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.396Z", "datePublished": "2026-10-28T10:35:08.287Z", "dateUpdated": "2026-10-31T12:44:04.972Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-31T12:44:04.972Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Validate the ITT reflected in a Reject PDU\n\nA Reject PDU carries a copy of the header it rejects, and\niscsi_handle_reject() takes the ITT out of that copy to find the task to\nclean up:\n\n memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));\n ...\n task = iscsi_itt_to_task(conn, rejected_pdu.itt);\n\nThat value is whatever the target put there. iscsi_itt_to_task() bounds\nthe index against cmds_max and checks nothing else, so any task in the\npool can be named, and iscsi_nop_out_rsp() then completes it.\n\nAn index that has never been used gives a NULL task->conn: the pool is\nzeroed at session setup and conn is assigned only when a task is\nallocated. If the task was used and returned, iscsi_complete_task() hits\nits WARN_ON_ONCE(task->state == ISCSI_TASK_FREE) and the refcount\nunderflows. An in-flight SCSI command is completed as successful - a 1\nMiB read returned 1048576 with none of its buffer written and no\nwarning.\n\nValidate the reflected ITT the way iscsi_itt_to_ctask() validates a\ncommand ITT, and require the task to be in flight and not a SCSI\ncommand.\n\n[ 6.248477] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI\n[ 6.249357] KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]\n[ 6.249951] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 7.2.0-rc5-ISCSI1-gf5098b6bae76 #1 PREEMPT(lazy)\n[ 6.250718] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 6.251616] RIP: 0010:iscsi_nop_out_rsp.constprop.0+0x46/0x160\n[ 6.252043] Code: c1 ea 03 48 83 ec 08 80 3c 02 00 0f 85 f5 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 58 48 8d 7d 60 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c0 00 00 00 48 8b 45 60 48 39 c3 74 50 48 b8 00\n[ 6.252813] RSP: 0018:ffff88806c907b80 EFLAGS: 00010206\n[ 6.253042] RAX: dffffc0000000000 RBX: ffff88800607e000 RCX: ffffffff8d571a25\n[ 6.253345] RDX: 000000000000000c RSI: ffff88806c907c38 RDI: 0000000000000060\n[ 6.253642] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff235a504\n[ 6.253947] R10: 0000000000000003 R11: 7463656e6e6f6320 R12: 0000000000000000\n[ 6.254251] R13: 0000000000000000 R14: ffff88806c907c38 R15: 0000000000000000\n[ 6.254549] FS: 0000000000000000(0000) GS:ffff8880d95bc000(0000) knlGS:0000000000000000\n[ 6.254887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 6.255140] CR2: 00007fc393e8ffc0 CR3: 0000000005252006 CR4: 0000000000770ef0\n[ 6.255439] PKRU: 55555554\n[ 6.255564] Call Trace:\n[ 6.255674] \n[ 6.255768] __iscsi_complete_pdu+0x18bf/0x22a0\n[ 6.256733] iscsi_complete_pdu+0x54/0xa0\n[ 6.256905] iscsi_tcp_data_recv_done+0xf4/0x250\n[ 6.257103] iscsi_tcp_recv_skb+0x31e/0xec0\n[ 6.257680] iscsi_sw_tcp_recv+0x12f/0x390\n[ 6.258061] __tcp_read_sock+0x1ab/0x810\n[ 6.258853] iscsi_sw_tcp_data_ready+0x18b/0x510\n[ 6.259808] tcp_data_queue+0x1f13/0x4cd0\n[ 6.260567] tcp_rcv_established+0x8a5/0x3a00\n[ 6.261931] tcp_v4_do_rcv+0x449/0x960\n[ 6.262269] tcp_v4_rcv+0x2245/0x3bc0" } ], "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 - A target-supplied ISCSI_OP_REJECT traverses iscsi_sw_tcp_data_ready(), iscsi_tcp_recv_skb(), iscsi_tcp_data_recv_done(), iscsi_complete_pdu(), and __iscsi_complete_pdu() to the patched iscsi_handle_reject(); the forged NOOP_OUT ITT is carried in the Reject PDU data over routable TCP.\nAC:L - The target sees live SCSI ITTs in initiator commands and can withhold their responses before naming one in a forged Reject; alternatively, index 1 in a freshly bound kzalloc'ed pool deterministically has task->conn == NULL. No race or uncontrolled condition is required.\nPR:N - iscsi_sw_tcp_conn_bind() installs receive callbacks before iscsi_conn_start() marks the session logged in, while __iscsi_complete_pdu() and iscsi_handle_reject() impose no login-state or authentication check on Reject PDUs. A target can therefore trigger the crash during login without credentials.\nUI:N - Once a configured initiator binds or automatically reconnects its iSCSI socket, the target's Reject is processed directly by iscsi_sw_tcp_data_ready(); selecting an unused task slot requires no victim read, mount, or other action.\nS:U - iscsi_handle_reject() corrupts task completion state or faults within the initiator host kernel; it does not cross a VM, IOMMU, or separate security-authority boundary.\nC:H - For a READ ITT, iscsi_nop_out_rsp() reaches iscsi_complete_task() and scsi_done() with sc->result still zero despite no Data-In; non-zeroed page-cache folios can consequently be marked uptodate and exposed as valid data, with the commit demonstrating a 1 MiB untouched read.\nI:H - The unchecked ITT lets iscsi_nop_out_rsp() falsely complete any observed in-flight SCSI task successfully; untouched READ buffers become valid filesystem data and WRITE commands can be acknowledged without commitment, permitting silent persistent storage or filesystem corruption.\nA:H - Selecting a never-used pool slot returns a task whose kzalloc'ed task->conn is NULL, which iscsi_nop_out_rsp() dereferences; the commit records the resulting general-protection fault, so one crafted Reject can oops or panic the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/libiscsi.c" ], "versions": [ { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "3637a4ad1d07477f1c60609876da6b60154d224b", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "21ef746340ce246344f34278e205b8960c1d8874", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "d20583a9dbe0d32a9af8384c857c95c0fc115103", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "ebb8c5ef2aabf66895253600e8390e8fc7094807", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "576125e7382a7826bd6c3c1ca4d9c582ed5be21d", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "7215a69b6456fda79c0935c2959045dff3fcaac8", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a", "status": "affected", "versionType": "git" }, { "version": "8afa1439fcff58da8f28c1d083046f229f6ab3de", "lessThan": "c5958c770b2a0ee492414e26b07da9164a0d1f5d", "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/scsi/libiscsi.c" ], "versions": [ { "version": "2.6.32", "status": "affected" }, { "version": "0", "lessThan": "2.6.32", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "2.6.32", "versionEndExcluding": "5.10.273" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "5.15.224" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.1.191" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.6.161" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.12.115" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "6.18.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.2.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.32", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3637a4ad1d07477f1c60609876da6b60154d224b" }, { "url": "https://git.kernel.org/stable/c/21ef746340ce246344f34278e205b8960c1d8874" }, { "url": "https://git.kernel.org/stable/c/d20583a9dbe0d32a9af8384c857c95c0fc115103" }, { "url": "https://git.kernel.org/stable/c/ebb8c5ef2aabf66895253600e8390e8fc7094807" }, { "url": "https://git.kernel.org/stable/c/576125e7382a7826bd6c3c1ca4d9c582ed5be21d" }, { "url": "https://git.kernel.org/stable/c/7215a69b6456fda79c0935c2959045dff3fcaac8" }, { "url": "https://git.kernel.org/stable/c/d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a" }, { "url": "https://git.kernel.org/stable/c/c5958c770b2a0ee492414e26b07da9164a0d1f5d" } ], "title": "scsi: libiscsi: Validate the ITT reflected in a Reject PDU", "x_generator": { "engine": "bippy-1.2.0" } } } }