smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer (CVE-2026-90175) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90175

smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer

Answer in brief

CVE-2026-90175 records a Unknown severity vulnerability in smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320 <4d6fe49fa3e7fbd779c761518e6572e340233c9b \|\| >=a77e0e02af1c2db5fc040511aa78a58a52e116ab <c9f2872e91b9fe99c1d0ba768906f7aeb48c8517 \|\| >=a77e0e02af1c2db5fc040511aa78a58a52e116ab <7a98c3b903b10c4d6176948254012b5ca24b071b \|\| >=a77e0e02af1c2db5fc040511aa78a58a52e116ab <abb5146b2d8197d695ea9eaa0847c73e34f00985 \|\| >=a77e0e02af1c2db5fc040511aa78a58a52e116ab <1c3ebf832d010c08afe1359215d4121cb1ed2de5 \|\| >=6.6.141 <6.6.157	4d6fe49fa3e7fbd779c761518e6572e340233c9b, c9f2872e91b9fe99c1d0ba768906f7aeb48c8517, 7a98c3b903b10c4d6176948254012b5ca24b071b, abb5146b2d8197d695ea9eaa0847c73e34f00985, 1c3ebf832d010c08afe1359215d4121cb1ed2de5, 6.6.157
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4d6fe49fa3e7fbd779c761518e6572e340233c9b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer Free it unconditionally after ksmbd_alloc_user() calls. kmemleak splat: unreferenced object 0xffff888103b83540 (size 192): comm "pool-0", pid 16970, jiffies 4377290937 hex dump (first 32 bytes): 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 408ccc66): __kvmalloc_node_noprof+0x730/0x920 handle_generic_event+0xec/0x1a0 [ksmbd] genl_family_rcv_msg_doit+0xe0/0x130 genl_rcv_msg+0x181/0x290 netlink_rcv_skb+0x4f/0x100 genl_rcv+0x28/0x40 netlink_unicast+0x1e6/0x2c0 netlink_sendmsg+0x20a/0x450 ____sys_sendmsg+0x2e8/0x310 ___sys_sendmsg+0x78/0xc0 __sys_sendmsg+0x63/0xc0 do_syscall_64+0xa1/0x670 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Quoted source text, attributed separately from HOL analysis.