{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100081","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.456Z","datePublished":"2026-11-06T18:23:02.185Z","dateUpdated":"2026-11-06T19:08:43.050Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-11-06T18:23:02.185Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen-netback: defer xenvif_mcast_addr_list_free()\n\nIn order for the function to legitimately avoid locking/RCU, it needs to\nrun after all TX/RX processing has finished/stopped: Lookups happen from\nxenvif_start_xmit(), while adds/removes happen from xenvif_tx_action()\n(called out of xenvif_poll()).\n\nMove the call out of xenvif_disconnect_data() (the call to the function\nfrom connect()'s error path doesn't require any cleaning up there), and\nput it past the synchronization point in backend_disconnect().\n\nThis is XSA-527 / CVE-2026-100081."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/interface.c","drivers/net/xen-netback/xenbus.c"],"versions":[{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"96e05a8ce243e2207704e2e7a6e7d1172730f515","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"0e786123e46d08d2247ce93a5435e45ed9f4c5d1","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"990d123d9eaa3ac6c979eed245658676d65ce0db","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"0d515c409033c8e2a645a781be3ca76ab825fc8c","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"a6bb2f1fa62c56279bdcdadce28d1310c5e12b62","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"34f0f63dc6dc11895a17bb5672451b6b11622c99","status":"affected","versionType":"git"},{"version":"b17075d5c1988b83f840d272c795ac17d57ce804","lessThan":"fb38fc58acb26d74fe8f7b19621fafaae3c040ff","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netback/interface.c","drivers/net/xen-netback/xenbus.c"],"versions":[{"version":"4.11","status":"affected"},{"version":"0","lessThan":"4.11","status":"unaffected","versionType":"semver"},{"version":"5.10.274","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.225","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.192","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.162","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.116","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.62","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.3.3","lessThanOrEqual":"7.3.*","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.10.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"5.15.225"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.1.192"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.6.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.12.116"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"6.18.62"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.11","versionEndExcluding":"7.3.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515"},{"url":"https://git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1"},{"url":"https://git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db"},{"url":"https://git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c"},{"url":"https://git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62"},{"url":"https://git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99"},{"url":"https://git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff"}],"title":"xen-netback: defer xenvif_mcast_addr_list_free()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/11/06/10"},{"url":"http://xenbits.xen.org/xsa/advisory-527.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-11-06T19:08:43.050Z"}}]}}