xen-netback: defer xenvif_mcast_addr_list_free()
Summary
| CVE | CVE-2026-100081 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-06 19:17:03 UTC |
| Updated | 2026-11-06 19:17:03 UTC |
| 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. |
Risk And Classification
EPSS: 0.002440000 probability, percentile 0.156860000 (date 2026-11-08)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 96e05a8ce243e2207704e2e7a6e7d1172730f515 git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 0e786123e46d08d2247ce93a5435e45ed9f4c5d1 git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 990d123d9eaa3ac6c979eed245658676d65ce0db git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 0d515c409033c8e2a645a781be3ca76ab825fc8c git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 a6bb2f1fa62c56279bdcdadce28d1310c5e12b62 git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 34f0f63dc6dc11895a17bb5672451b6b11622c99 git | Not specified |
| CNA | Linux | Linux | affected b17075d5c1988b83f840d272c795ac17d57ce804 fb38fc58acb26d74fe8f7b19621fafaae3c040ff git | Not specified |
| CNA | Linux | Linux | affected 4.11 | Not specified |
| CNA | Linux | Linux | unaffected 4.11 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.274 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.225 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.192 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.162 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.116 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.62 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3.3 7.3.* semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| www.openwall.com/lists/oss-security/2026/11/06/10 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| xenbits.xen.org/xsa/advisory-527.html | af854a3a-2127-422b-91ae-364da2661108 | xenbits.xen.org | |
| git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.