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.
Metrics
Affected Vendors & Products
Advisories
Source | ID | Title |
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DLA-2557-1 | linux-4.19 security update |
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DLA-2586-1 | linux security update |
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DSA-4843-1 | linux security update |
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EUVD-2020-21931 | 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. |
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USN-4749-1 | Linux kernel vulnerabilities |
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USN-4750-1 | Linux kernel vulnerabilities |
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USN-4751-1 | Linux kernel vulnerabilities |
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USN-4876-1 | Linux kernel vulnerabilities |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 16 Jul 2025 13:45:00 +0000
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Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2024-08-04T16:55:10.494Z
Reserved: 2020-12-04T00:00:00
Link: CVE-2020-29569

No data.

Status : Modified
Published: 2020-12-15T17:15:14.707
Modified: 2024-11-21T05:24:13.443
Link: CVE-2020-29569

No data.

No data.