4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack 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
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
7.5 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
15.7%
In the Linux kernel, the following vulnerability has been resolved:
xen-netback: take a reference to the RX task thread Do this in order to
prevent the task from being freed if the thread returns (which can be
triggered by the frontend) before the call to kthread_stop done as part of
the backend tear down. Not taking the reference will lead to a
use-after-free in that scenario. Such reference was taken before but
dropped as part of the rework done in 2ac061ce97f4. Reintroduce the
reference taking and add a comment this time explaining why it’s needed.
This is XSA-374 / CVE-2021-28691.
git.kernel.org/linus/107866a8eb0b664675a260f1ba0655010fac1e08 (5.13-rc6)
git.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08
git.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4
git.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e
launchpad.net/bugs/cve/CVE-2021-47111
nvd.nist.gov/vuln/detail/CVE-2021-47111
security-tracker.debian.org/tracker/CVE-2021-47111
www.cve.org/CVERecord?id=CVE-2021-47111
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack 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
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
7.5 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
15.7%