xen-netback: defer xenvif_mcast_addr_list_free()
CVSS score
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EPSS probability
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Risk score
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Published
1 d ago
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Vulnerability description
DayBreach AI Explanation
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Short explanation
A vulnerability has been identified in the Linux kernel xen-netback driver due to the improper execution timing of xenvif_mcast_addr_list_free(). Tracked as XSA-527 and CVE-2026-100081, this issue requires the function to run after all TX/RX processing has finished or stopped.
This vulnerability affects memory management and synchronization flow within the Linux kernel xen-netback component. Failing to execute the function at the correct time can lead to system instability and potential security risks.
What should be done?
- Follow vendor advisories and related git updates
- Apply kernel updates
Chain of evidence and sources
Linux çekirdeğindeki xen-netback sürücüsünde XSA-527 / CVE-2026-100081 zafiyeti bulunmaktadır.
xenvif_mcast_addr_list_free() fonksiyonu, tüm TX/RX işlemlerinin tamamlanmasından sonra çalışacak şekilde yeniden konumlandırılmalıdır.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: xen-netback: defer xenvif_mcast_addr_list_free() In order for the function to legitimately avoid locking/RCU, it needs to run after all TX/RX processing has finished/stopped: Lookups happen from xenvif_start_xmit(), while adds/removes happen from xenvif_tx_action() (called out of xenvif_poll()). Move the call out of xenvif_disconnect_data() (the call to the function from connect()'s error path doesn't require any cleaning up there), and put it past the synchronization point in backend_disconnect(). This is XSA-527 / CVE-2026-100081.
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-100081 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-100081 weaknesses.
Official Sources and Advisories
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