GHSA-92V8-WFX9-6CF9

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-31 15:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

scsi: libiscsi: Validate the ITT reflected in a Reject PDU

A Reject PDU carries a copy of the header it rejects, and iscsi_handle_reject() takes the ITT out of that copy to find the task to clean up:

  memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
  ...
  task = iscsi_itt_to_task(conn, rejected_pdu.itt);

That value is whatever the target put there. iscsi_itt_to_task() bounds the index against cmds_max and checks nothing else, so any task in the pool can be named, and iscsi_nop_out_rsp() then completes it.

An index that has never been used gives a NULL task->conn: the pool is zeroed at session setup and conn is assigned only when a task is allocated. If the task was used and returned, iscsi_complete_task() hits its WARN_ON_ONCE(task->state == ISCSI_TASK_FREE) and the refcount underflows. An in-flight SCSI command is completed as successful - a 1 MiB read returned 1048576 with none of its buffer written and no warning.

Validate the reflected ITT the way iscsi_itt_to_ctask() validates a command ITT, and require the task to be in flight and not a SCSI command.

[ 6.248477] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI [ 6.249357] KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] [ 6.249951] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 7.2.0-rc5-ISCSI1-gf5098b6bae76 #1 PREEMPT(lazy) [ 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 [ 6.251616] RIP: 0010:iscsi_nop_out_rsp.constprop.0+0x46/0x160 [ 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 [ 6.252813] RSP: 0018:ffff88806c907b80 EFLAGS: 00010206 [ 6.253042] RAX: dffffc0000000000 RBX: ffff88800607e000 RCX: ffffffff8d571a25 [ 6.253345] RDX: 000000000000000c RSI: ffff88806c907c38 RDI: 0000000000000060 [ 6.253642] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff235a504 [ 6.253947] R10: 0000000000000003 R11: 7463656e6e6f6320 R12: 0000000000000000 [ 6.254251] R13: 0000000000000000 R14: ffff88806c907c38 R15: 0000000000000000 [ 6.254549] FS: 0000000000000000(0000) GS:ffff8880d95bc000(0000) knlGS:0000000000000000 [ 6.254887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6.255140] CR2: 00007fc393e8ffc0 CR3: 0000000005252006 CR4: 0000000000770ef0 [ 6.255439] PKRU: 55555554 [ 6.255564] Call Trace: [ 6.255674] [ 6.255768] __iscsi_complete_pdu+0x18bf/0x22a0 [ 6.256733] iscsi_complete_pdu+0x54/0xa0 [ 6.256905] iscsi_tcp_data_recv_done+0xf4/0x250 [ 6.257103] iscsi_tcp_recv_skb+0x31e/0xec0 [ 6.257680] iscsi_sw_tcp_recv+0x12f/0x390 [ 6.258061] __tcp_read_sock+0x1ab/0x810 [ 6.258853] iscsi_sw_tcp_data_ready+0x18b/0x510 [ 6.259808] tcp_data_queue+0x1f13/0x4cd0 [ 6.260567] tcp_rcv_established+0x8a5/0x3a00 [ 6.261931] tcp_v4_do_rcv+0x449/0x960 [ 6.262269] tcp_v4_rcv+0x2245/0x3bc0

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-99153"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:35Z",
    "severity": "CRITICAL"
  },
  "details": "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(\u0026rejected_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-\u003econn: 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-\u003estate == 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 \u003c80\u003e 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]  \u003cIRQ\u003e\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",
  "id": "GHSA-92v8-wfx9-6cf9",
  "modified": "2026-10-31T15:30:22Z",
  "published": "2026-10-28T12:31:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99153"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21ef746340ce246344f34278e205b8960c1d8874"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3637a4ad1d07477f1c60609876da6b60154d224b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/576125e7382a7826bd6c3c1ca4d9c582ed5be21d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7215a69b6456fda79c0935c2959045dff3fcaac8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5958c770b2a0ee492414e26b07da9164a0d1f5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d20583a9dbe0d32a9af8384c857c95c0fc115103"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebb8c5ef2aabf66895253600e8390e8fc7094807"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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