CVE-2026-1764: GNOME localsearch Buffer Overflow Flaw

CVE-2026-1764 Overview

A flaw in GNOME localsearch, previously known as tracker-miners, affects the MP3 Extractor component. The vulnerability resides in the extract_performers_tags function, which lacks a bounds check when parsing ID3v2.4 tags in MP3 files. A specially crafted MP3 file triggers a heap buffer over-read, classified under [CWE-125]. The primary impact is Denial of Service (DoS) caused by reading unmapped memory. In some scenarios, the flaw can also leak adjacent heap data, resulting in information disclosure. Exploitation requires the victim to interact with a malicious MP3 file indexed by the local search service.

Critical Impact
An attacker can crash the GNOME localsearch indexer and potentially read heap memory contents by delivering a crafted MP3 file to a target user.

Affected Products

GNOME localsearch (formerly tracker-miners) MP3 Extractor
Linux distributions shipping tracker-miners or localsearch with GNOME desktop environments
Red Hat Enterprise Linux variants tracking this advisory

Discovery Timeline

2026-06-16 - CVE-2026-1764 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-1764

Vulnerability Analysis

The vulnerability resides in the MP3 metadata extraction code path of GNOME localsearch. The extract_performers_tags function parses ID3v2.4 frames that store performer credit information. When processing these frames, the function fails to validate the size of the input buffer against the expected boundaries of the parsed structure. Parsing a crafted MP3 file causes the extractor to read beyond the allocated heap region, producing an out-of-bounds read condition. The attacker-controlled fields determine how far past the allocated buffer the read extends. The miner process consuming the malformed file crashes, halting metadata indexing for the affected user session.

Root Cause

The root cause is a missing bounds check in extract_performers_tags while iterating over ID3v2.4 tag fields. The function trusts length fields supplied by the file without verifying that the requested read remains within the allocated buffer. This results in an out-of-bounds read of heap memory.

Attack Vector

The attack vector is local and requires user interaction. A target user must obtain a crafted MP3 file and place it in a directory monitored by the localsearch indexer, such as ~/Music or ~/Downloads. The indexer automatically opens the file to extract metadata, triggering the over-read. The required privileges are low, limited to the user running the GNOME session.

The vulnerability is described in prose only; no verified proof-of-concept code is available. See the Red Hat CVE-2026-1764 Advisory and Red Hat Bug #2435980 for additional technical context.

Detection Methods for CVE-2026-1764

Indicators of Compromise

Repeated crashes or restarts of the localsearch-extract or tracker-extract process on affected hosts.
Unexpected MP3 files appearing in user directories monitored by the indexer, particularly files with malformed ID3v2.4 tags.
Core dumps or systemd-coredump entries referencing the localsearch or tracker-miners binary.

Detection Strategies

Monitor process termination events for the metadata extractor and correlate with recent file write activity in monitored directories.
Inspect MP3 files for malformed or oversized ID3v2.4 frame headers using validation tools before indexing.
Review desktop session logs for entries from the GNOME extractor service indicating parser failures.

Monitoring Recommendations

Collect and centralize systemd-coredump and journald logs from Linux workstations to identify extractor crashes.
Alert on download or transfer of MP3 files from untrusted sources to user home directories.
Track package versions of localsearch and tracker-miners across the fleet to confirm patch deployment status.

How to Mitigate CVE-2026-1764

Immediate Actions Required

Apply vendor-supplied updates for localsearch or tracker-miners as soon as packages become available from your Linux distribution.
Restrict the directories monitored by the localsearch indexer to trusted locations only.
Educate users to avoid opening or storing MP3 files received from untrusted sources.

Patch Information

Refer to the Red Hat CVE-2026-1764 Advisory for patch availability and affected package versions. Distribution-specific updates should be tracked through each vendor's security bulletins linked to Red Hat Bug #2435980.

Workarounds

Disable the MP3 extractor module or the localsearch service if metadata indexing is not required in your environment.
Remove or quarantine untrusted MP3 files from indexed directories before the extractor processes them.
Configure tracker-miners to exclude directories that may receive files from external sources.

bash

# Configuration example: disable tracker/localsearch indexing for the current user
systemctl --user mask localsearch-extract-3.service
systemctl --user mask tracker-extract-3.service
tracker3 daemon --terminate