---
id: "CVE-2026-98731"
kind: "vulnerability"
aliases: ["CVE-2026-98731"]
title: "Linux kernel: Bluetooth Intel PCIe frame length overflow mishandles packets"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["bluetooth", "infrastructure", "intel-pcie", "laptops", "linux-kernel"]
not_affected_if: ["module-not-loaded", "no-intel-pcie-bluetooth"]
published_at: "2026-10-18T16:17:26+00:00"
first_seen_at: "2026-10-23T21:57:16+00:00"
updated_at: "2026-10-25T05:17:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98731", "first_seen_at": "2026-10-23T21:57:16+00:00"}]
---

# Linux kernel: Bluetooth Intel PCIe frame length overflow mishandles packets

In the Linux kernel's Bluetooth Intel PCIe driver, a 16-bit length sum can wrap for large ACL or ISO frames, which skips a length check and lets the packet be truncated. The sources describe the bug and its fix (widening the length variable to 32 bits) but do not state a demonstrated impact beyond that.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `uname -r` and compare against the fixed kernel versions listed in the NVD entry
- Check whether the `btintel_pcie` module is loaded with `lsmod | grep btintel_pcie`
- Confirm the kernel source includes the fix by checking the `btintel_pcie_recv_frame()` function for a 32-bit `plen`

## Fix

- Update the Linux kernel to a release that includes the upstream fix for CVE-2026-98731 (exact fixed versions: unknown)
- Reboot into the patched kernel after your distribution ships it

## Timeline

- 2026-10-23T21:57:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98731

## From the sources

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btintel_pcie: fix plen overflow in btintel_pcie_recv_frame()

plen is u16 and computed as HDR_SIZE + dlen. For ACL/ISO frames dlen
is a 16-bit field, so a value >= 0xFFFC wraps the sum, bypassing the
"skb->len < plen" check and letting skb_trim() truncate the packet.

Widen plen to u32 so the addition cannot wrap.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_