{"id":"CVE-2020-29569","state":"PUBLISHED","title":"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->xenb","description":"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->xenblkd 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.","publishedAt":"2020-12-15T17:00:36.000Z","updatedAt":"2024-08-04T16:55:10.494Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-350.html","https://www.debian.org/security/2021/dsa-4843","https://security.netapp.com/advisory/ntap-20210205-0001/","https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html","https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html","https://security.gentoo.org/glsa/202107-30"],"weaknesses":[],"ingestedAt":"2026-10-29T19:47:16.535Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/29xxx/CVE-2020-29569.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-29569","state":"PUBLISHED","datePublished":"2020-12-15T17:00:36.000Z","dateUpdated":"2024-08-04T16:55:10.494Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2020-12-04T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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->xenblkd 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."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-350.html","tags":["x_refsource_MISC"]},{"url":"https://www.debian.org/security/2021/dsa-4843","name":"DSA-4843","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"https://security.netapp.com/advisory/ntap-20210205-0001/","tags":["x_refsource_CONFIRM"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html","name":"[debian-lts-announce] 20210212 [SECURITY] [DLA 2557-1] linux-4.19 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html","name":"[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://security.gentoo.org/glsa/202107-30","name":"GLSA-202107-30","tags":["vendor-advisory","x_refsource_GENTOO"]}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mitre","dateUpdated":"2021-07-12T04:06:41.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2020-29569","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. 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