7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
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
0.001 Low
EPSS
Percentile
36.5%
Severity: High
Date : 2020-04-01
CVE-ID : CVE-2020-8835
Package : linux-hardened
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-1120
The package linux-hardened before version 5.5.13.b-1 is vulnerable to
privilege escalation.
Upgrade to 5.5.13.b-1.
The problem has been fixed upstream in version 5.5.13.b.
By default linux-hardened is safe as it restricts BPF access to
privileged users. In case the kernel.unprivileged_bpf_disabled setting
has been explicitly changed, it can be restricted again:
An out-of-bounds access flaw was found in the Linux kernelβs
implementation of the eBPF code verifier, where an incorrect register
bounds calculation while checking 32-bit instructions in an eBPF
program occurs. This flaw allows an unprivileged user or process to
execute eBPF programs to crash the kernel, resulting in a denial of
service or potentially gaining root privileges on the system.
An unprivileged local user or process can crash the kernel, resulting
in a denial of service, or potentially gain root privileges on the
system in case the default BPF access has been changed to allow
unprivileged users.
https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results
https://lore.kernel.org/bpf/[email protected]/T/
https://www.openwall.com/lists/oss-security/2020/03/30/3
https://security.archlinux.org/CVE-2020-8835
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ArchLinux | any | any | linux-hardened | <Β 5.5.13.b-1 | UNKNOWN |
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
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
0.001 Low
EPSS
Percentile
36.5%