Ubuntu.comUB:CVE-2021-28691CVE-2021-28691
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
0.0004 Low
EPSS
Percentile
11.7%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 21.04 | noarch | linux | < 5.11.0-31.33 | UNKNOWN |
| ubuntu | 21.04 | noarch | linux-aws | < 5.11.0-1016.17 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws-5.11 | < 5.11.0-1016.17~20.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws-5.8 | < 5.8.0-1042.44~20.04.1 | UNKNOWN |
| ubuntu | 21.04 | noarch | linux-azure | < 5.11.0-1013.14 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure-5.11 | < 5.11.0-1013.14~20.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure-5.8 | < 5.8.0-1040.43~20.04.1 | UNKNOWN |
| ubuntu | 22.04 | noarch | linux-azure-fde | < any | UNKNOWN |
| ubuntu | 21.04 | noarch | linux-gcp | < 5.11.0-1017.19 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-gcp-5.11 | < 5.11.0-1017.19~20.04.1 | UNKNOWN |
References
launchpad.net/bugs/cve/CVE-2021-28691
nvd.nist.gov/vuln/detail/CVE-2021-28691
security-tracker.debian.org/tracker/CVE-2021-28691
ubuntu.com/security/notices/USN-5015-1
ubuntu.com/security/notices/USN-5046-1
ubuntu.com/security/notices/USN-5050-1
www.cve.org/CVERecord?id=CVE-2021-28691
xenbits.xen.org/xsa/advisory-374.html
Related
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
0.0004 Low
EPSS
Percentile
11.7%