CVE-2020-29569

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Source
https://cve.org/CVERecord?id=CVE-2020-29569
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-29569.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-29569
Downstream
Related
Published
2020-12-15T17:15:14.707Z
Modified
2026-03-15T22:37:58.972826Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
[none]
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->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.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "4.14.1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.1.44"
            },
            {
                "fixed": "4.2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.4.80"
            },
            {
                "fixed": "4.4.254"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.9.36"
            },
            {
                "fixed": "4.9.249"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.11.9"
            },
            {
                "fixed": "4.12"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.12"
            },
            {
                "fixed": "4.14.213"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.15"
            },
            {
                "fixed": "4.19.164"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.20"
            },
            {
                "fixed": "5.4.86"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "9.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-29569.json"