{"id":"CVE-2026-99152","aliases":[],"title":"scsi: libiscsi: Validate the task named by a management response","titleSource":"Linux","descriptionSource":"Linux","products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8","status":"affected","lessThan":"55a65ef61e2775aeb18fda63bd1959fa8b41f936","versionType":"git"},{"version":"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8","status":"affected","lessThan":"f721487523d45941aed4b0ac8d829b0461a7d860","versionType":"git"},{"version":"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8","status":"affected","lessThan":"11bffcd9cb346732eab2914ef44fe777a3f0b585","versionType":"git"}],"defaultStatus":"unaffected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99152"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"2.6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.18","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99152"}],"remediation":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Validate the task named by a management response\n\n__iscsi_complete_pdu() fetches the task for five response types from one\nplace and checks only that the index resolved:\n\n      case ISCSI_OP_LOGOUT_RSP:\n      case ISCSI_OP_LOGIN_RSP:\n      case ISCSI_OP_TEXT_RSP:\n      case ISCSI_OP_SCSI_TMFUNC_RSP:\n      case ISCSI_OP_NOOP_IN:\n              task = iscsi_itt_to_task(conn, hdr->itt);\n              if (!task)\n                      return ISCSI_ERR_BAD_ITT;\n\niscsi_itt_to_task() bounds the index against cmds_max and looks at\nnothing else, so a target can name any slot in the pool, including one\nthat has never been used. task->conn is then NULL, and both\niscsi_nop_out_rsp() and iscsi_complete_task() dereference it. One\nunsolicited NOP-In is enough; a Text Response carrying the same ITT\ncrashes in iscsi_complete_task() instead.\n\nRequire the task to be in flight and not a SCSI command, the way\niscsi_itt_to_ctask() does for the command opcodes.\n\n[    6.298634] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI\n[    6.298642] KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]\n[    6.298652] CPU: 1 UID: 0 PID: 111 Comm: iscsistart Not tainted 7.2.0-rc5-ISCSI1-gf5098b6bae76 #1 PREEMPT(lazy)\n[    6.298654] 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[    6.298656] RIP: 0010:iscsi_nop_out_rsp.constprop.0+0x46/0x160\n[    6.298691] 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[    6.298698] RSP: 0018:ffff88806c907be8 EFLAGS: 00010206\n[    6.298701] RAX: dffffc0000000000 RBX: ffff888006116800 RCX: 0000000000000020\n[    6.298702] RDX: 000000000000000c RSI: ffff88800525d578 RDI: 0000000000000060\n[    6.298703] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000\n[    6.298706] R10: 0000000000000020 R11: 0000000000000000 R12: 0000000000000000\n[    6.298706] R13: 000000000000002e R14: ffff8880056eb440 R15: ffff888006116800\n[    6.298707] FS:  00007fc02d1c2740(0000) GS:ffff8880b29bc000(0000) knlGS:0000000000000000\n[    6.298710] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    6.298711] CR2: 000055fe3b56ddf8 CR3: 00000000053b9004 CR4: 0000000000770ef0\n[    6.298712] PKRU: 55555554\n[    6.298713] Call Trace:\n[    6.298714]  <IRQ>\n[    6.298714]  __iscsi_complete_pdu+0x13a8/0x22a0\n[    6.298758]  iscsi_complete_pdu+0x54/0xa0\n[    6.298759]  iscsi_tcp_hdr_recv_done+0x870/0x2c80\n[    6.298778]  iscsi_tcp_recv_skb+0x31e/0xec0\n[    6.298800]  iscsi_sw_tcp_recv+0x12f/0x390\n[    6.298804]  __tcp_read_sock+0x1ab/0x810\n[    6.298812]  iscsi_sw_tcp_data_ready+0x18b/0x510\n[    6.298814]  tcp_rcv_established+0x1f56/0x3a00\n[    6.298842]  tcp_v4_do_rcv+0x449/0x960\n[    6.298847]  tcp_v4_rcv+0x2245/0x3bc0","severity":"unknown","score":null,"published":"2026-10-28T10:35:07.622Z","modified":"2026-10-28T10:35:07.622Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://git.kernel.org/stable/c/55a65ef61e2775aeb18fda63bd1959fa8b41f936","https://git.kernel.org/stable/c/f721487523d45941aed4b0ac8d829b0461a7d860","https://git.kernel.org/stable/c/11bffcd9cb346732eab2914ef44fe777a3f0b585"],"sources":[{"name":"CVE","id":"CVE-2026-99152","modified":"2026-10-28T10:35:07.622Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99152"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T17:45:30.911Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}