7 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
linux is vulnerable to arbitrary code execution. The vulnerability exists through a TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory due to a size check is in fs/nfs/nfs4proc.c
instead of fs/nfs/nfs4xdr.c
.
lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21
lists.debian.org/debian-lts-announce/2020/09/msg00025.html
lists.debian.org/debian-lts-announce/2020/10/msg00032.html
lists.debian.org/debian-lts-announce/2020/10/msg00034.html
twitter.com/grsecurity/status/1303370421958578179
usn.ubuntu.com/4525-1/
usn.ubuntu.com/4527-1/
usn.ubuntu.com/4578-1/
7 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P