Ubuntu.comUB:CVE-2021-43057CVE-2021-43057
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
7.2 High
CVSS2
Access Vector
LOCAL
Access 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
0.0004 Low
EPSS
Percentile
5.3%
An issue was discovered in the Linux kernel before 5.14.8. A use-after-free
in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME)
could be used by local attackers to cause memory corruption and escalate
privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to
access the subjective credentials of another task.
Notes
| Author | Note |
|---|---|
| sbeattie | Ubuntu systems are configured to use AppArmor by default, a system would need to be configured via kernel command line to use SELinux or Smack to be affected. |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 21.10 | noarch | linux | < 5.13.0-22.22 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-aws | < 5.13.0-1007.8 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-azure | < 5.13.0-1008.9 | UNKNOWN |
| ubuntu | 22.04 | noarch | linux-azure-fde | < any | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-gcp | < 5.13.0-1007.8 | UNKNOWN |
| ubuntu | 24.04 | noarch | linux-gke | < any | UNKNOWN |
| ubuntu | 22.04 | noarch | linux-gkeop | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-hwe-5.13 | < 5.13.0-22.22~20.04.1 | UNKNOWN |
| ubuntu | 21.10 | noarch | linux-kvm | < 5.13.0-1006.6 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-oem-5.13 | < 5.13.0-1020.24 | UNKNOWN |
References
bugs.chromium.org/p/project-zero/issues/detail?id=2229
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8
git.kernel.org/linus/a3727a8bac0a9e77c70820655fd8715523ba3db7 (5.15-rc3)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7
launchpad.net/bugs/cve/CVE-2021-43057
nvd.nist.gov/vuln/detail/CVE-2021-43057
security-tracker.debian.org/tracker/CVE-2021-43057
ubuntu.com/security/notices/USN-5162-1
www.cve.org/CVERecord?id=CVE-2021-43057
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
7.2 High
CVSS2
Access Vector
LOCAL
Access 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
0.0004 Low
EPSS
Percentile
5.3%