{
  "cveId": "CVE-2026-99153",
  "url": "https://patchblox.com/security/cve/CVE-2026-99153",
  "summary": "CVE-2026-99153 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99153 (version 6.12.115-2), released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "scsi: libiscsi: Validate the ITT reflected in a Reject PDU",
  "description": "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(\u0026rejected_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-\u003Econn: 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-\u003Estate == 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 \u002B 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\u002B0x46/0x160 [    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 \u003C80\u003E 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]  \u003CIRQ\u003E [    6.255768]  __iscsi_complete_pdu\u002B0x18bf/0x22a0 [    6.256733]  iscsi_complete_pdu\u002B0x54/0xa0 [    6.256905]  iscsi_tcp_data_recv_done\u002B0xf4/0x250 [    6.257103]  iscsi_tcp_recv_skb\u002B0x31e/0xec0 [    6.257680]  iscsi_sw_tcp_recv\u002B0x12f/0x390 [    6.258061]  __tcp_read_sock\u002B0x1ab/0x810 [    6.258853]  iscsi_sw_tcp_data_ready\u002B0x18b/0x510 [    6.259808]  tcp_data_queue\u002B0x1f13/0x4cd0 [    6.260567]  tcp_rcv_established\u002B0x8a5/0x3a00 [    6.261931]  tcp_v4_do_rcv\u002B0x449/0x960 [    6.262269]  tcp_v4_rcv\u002B0x2245/0x3bc0",
  "published": "2026-10-28T11:17:35Z",
  "severity": "Moderate",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00552,
  "epssPercentile": 0.46347,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99153",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-99153",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99153",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}