{"api_version":"1","generated_at":"2026-10-28T16:52:39+00:00","cve":"CVE-2026-99153","urls":{"html":"https://cve.report/CVE-2026-99153","api":"https://cve.report/api/cve/CVE-2026-99153.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99153","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99153"},"summary":{"title":"scsi: libiscsi: Validate the ITT reflected in a Reject PDU","description":"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]  <IRQ>\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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:35","updated_at":"2026-10-28 11:17:35"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a","name":"https://git.kernel.org/stable/c/d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7215a69b6456fda79c0935c2959045dff3fcaac8","name":"https://git.kernel.org/stable/c/7215a69b6456fda79c0935c2959045dff3fcaac8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c5958c770b2a0ee492414e26b07da9164a0d1f5d","name":"https://git.kernel.org/stable/c/c5958c770b2a0ee492414e26b07da9164a0d1f5d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99153","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99153","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8afa1439fcff58da8f28c1d083046f229f6ab3de 7215a69b6456fda79c0935c2959045dff3fcaac8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8afa1439fcff58da8f28c1d083046f229f6ab3de d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8afa1439fcff58da8f28c1d083046f229f6ab3de c5958c770b2a0ee492414e26b07da9164a0d1f5d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.32","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.32 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/scsi/libiscsi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7215a69b6456fda79c0935c2959045dff3fcaac8","status":"affected","version":"8afa1439fcff58da8f28c1d083046f229f6ab3de","versionType":"git"},{"lessThan":"d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a","status":"affected","version":"8afa1439fcff58da8f28c1d083046f229f6ab3de","versionType":"git"},{"lessThan":"c5958c770b2a0ee492414e26b07da9164a0d1f5d","status":"affected","version":"8afa1439fcff58da8f28c1d083046f229f6ab3de","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/scsi/libiscsi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.32"},{"lessThan":"2.6.32","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"2.6.32","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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]  <IRQ>\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"}],"providerMetadata":{"dateUpdated":"2026-10-28T10:35:08.287Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99153","datePublished":"2026-10-28T10:35:08.287Z","dateReserved":"2026-09-25T10:25:14.396Z","dateUpdated":"2026-10-28T10:35:08.287Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:35","lastModifiedDate":"2026-10-28 11:17:35","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99153","Ordinal":"1","Title":"scsi: libiscsi: Validate the ITT reflected in a Reject PDU","CVE":"CVE-2026-99153","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99153","Ordinal":"1","NoteData":"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]  <IRQ>\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","Type":"Description","Title":"scsi: libiscsi: Validate the ITT reflected in a Reject PDU"}]}}}