{"id":"ALPINE-CVE-2020-29569","details":"An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring-\u003exenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.","modified":"2026-09-14T13:30:02.610854667Z","published":"2020-12-15T17:15:14.707Z","upstream":["CVE-2020-29569"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2020-29569"}],"affected":[{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}},{"package":{"name":"linux-lts","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/linux-lts?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.4-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-29569.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}