CVE-2026-100081
xen-netback: defer xenvif_mcast_addr_list_free()
Description
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.
INFO
Published Date :
Nov. 6, 2026, 7:17 p.m.
Last Modified :
Nov. 6, 2026, 7:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the patched version.
- Ensure all network processing stops before freeing addresses.
- Verify the synchronization point in backend_disconnect.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-100081.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes 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.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-100081 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-100081 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Nov. 06, 2026
Action Type Old Value New Value Added Description 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100081.json">CVE-2026-100081</a> Added Reference https://git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c Added Reference https://git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1 Added Reference https://git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99 Added Reference https://git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515 Added Reference https://git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db Added Reference https://git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62 Added Reference https://git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 06, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/11/06/10 Added Reference http://xenbits.xen.org/xsa/advisory-527.html