SecuritySpace - CVE-2021-28691

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CVE ID: CVE-2021-28691

Description: Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

Test IDs: None available

Cross References: Common Vulnerability Exposure (CVE) ID: CVE-2021-28691
https://security.gentoo.org/glsa/202107-30
https://xenbits.xenproject.org/xsa/advisory-374.txt
https://xenbits.xenproject.org/xsa/advisory-374.txt

CVE ID:	CVE-2021-28691
Description:	Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-28691 https://security.gentoo.org/glsa/202107-30 https://xenbits.xenproject.org/xsa/advisory-374.txt https://xenbits.xenproject.org/xsa/advisory-374.txt