Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.5.0, < 5.12.2 |
| Netapp | Cloud Backup | - |
| Netapp | H410C Firmware | - |
| Netapp | H410C | - |
| Netapp | H300S Firmware | - |
| Netapp | H300S | - |
| Netapp | H500S Firmware | - |
| Netapp | H500S | - |
| Netapp | H700S Firmware | - |
| Netapp | H700S | - |
| Netapp | H300E Firmware | - |
| Netapp | H300E | - |
| Netapp | H500E Firmware | - |
| Netapp | H500E | - |
| Netapp | H700E Firmware | - |
| Netapp | H700E | - |
| Netapp | H410S Firmware | - |
| Netapp | H410S | - |
Related Weaknesses (CWE)
References
- https://security.gentoo.org/glsa/202107-30Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210805-0002/Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-374.txtThird Party Advisory
- https://security.gentoo.org/glsa/202107-30Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210805-0002/Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-374.txtThird Party Advisory
FAQ
What is CVE-2021-28691?
CVE-2021-28691 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 qu...
How severe is CVE-2021-28691?
CVE-2021-28691 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28691?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Netapp Cloud Backup, Netapp H410C Firmware, Netapp H410C, Netapp H300S Firmware.