# CVE-2026-89583

## Summary

- **CVE ID:** CVE-2026-89583
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

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

Bluetooth: eir: Fix OOB read in eir_get_service_data()

eir_get_service_data() walks the advertising data for a Service Data
field with a matching UUID.  On a mismatch it advances:

    eir += dlen;
    eir_len -= dlen;

eir_get_data() reports dlen as the field's data length, but the field
spans dlen + 2 bytes once its length and type bytes count, and more
when non-Service-Data fields were skipped to reach it.  The pointer
lands correctly on the next field.  eir_len does not, and the shortfall
compounds across fields until eir_get_data() reads the length and type
bytes of a "field" past the end of the buffer.

For an ISO broadcast sink that buffer is hcon->le_per_adv_data[], filled
from the periodic advertising reports of a remote broadcaster.  A PA
payload packed with mismatching Service Data fields walks off the array
into the rest of struct hci_conn.  A drifted field that matches the BAA
UUID puts those bytes in iso_pi(sk)->base, where user space reads them
back with getsockopt(BT_ISO_BASE).

Recompute eir_len from the end of the buffer each iteration.

## Affected Products

- Linux — Linux (8f9ae5b3ae80f168a6224529e3787f4fb27f299a)
- Linux — Linux (5.19)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/815fc98c227a78cbd93d4c29f2833705b7c2bc0f)
- [CNA](https://git.kernel.org/stable/c/c21fa79301d7d6ac0a4ec6c51e8ba10beaa08c50)
- [CNA](https://git.kernel.org/stable/c/bb56e97bd67614238c1c0a4084704ccadbb875b4)
- [CNA](https://git.kernel.org/stable/c/4beb198bc59b242404a47c21990bc84165052c8a)
- [CNA](https://git.kernel.org/stable/c/b6902adf81ea2ce14b1040dd97b6980050a8125a)
- [CNA](https://git.kernel.org/stable/c/1a28aae7f1fc8c06c0d02f153541be4fc7bacb74)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._