# CVE-2026-90175: smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer

CVE-2026-90175 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90175, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-90175
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 17, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90175

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-90175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90175.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-90175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90175.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-90175](https://patchblox.com/security/data/fix/linux/debian-cve-2026-90175.md) | Sep 23, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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