Kernel service interruption via unterminated team option
Published Feb 27, 2025 · Updated May 12, 2026
Use of uninitialized data in Linux team networking allows local users to interrupt service via a crafted netlink team option. The team_nl_options_set_doit function accepted TEAM_OPTION_TYPE_STRING data by checking only its maximum length, then downstream mode handling treated the bytes as a terminated string and read beyond initialized input. Local low-privilege access to the generic netlink team interface is required; published scoring limits impact to availability.
Summary
What happened
Use of uninitialized data in Linux team networking allows local users to interrupt service via a crafted netlink team option. The team_nl_options_set_doit function accepted TEAM_OPTION_TYPE_STRING data by checking only its maximum length, then downstream mode handling treated the bytes as a terminated string and read beyond initialized input. Local low-privilege access to the generic netlink team interface is required; published scoring limits impact to availability.
The record
- CVE
- CVE-2025-21787
- Published
- Feb 27, 2025
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-908, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 27, 2025CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- syzbot C and syz reproducers for unterminated team optionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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