Vulnerability Name:

CVE-2021-4159 (CCN-234277)

Assigned:2021-12-29
Published:2021-12-29
Updated:2022-10-06
Summary:A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.
CVSS v3 Severity:4.4 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N)
3.9 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
4.4 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N)
3.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-Other
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2021-4159

Source: MISC
Type: Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-4159

Source: CCN
Type: Red Hat Bugzilla - Bug 2036024
CVE-2021-4159 kernel: another kernel ptr leak vulnerability via BPF in coerce_reg_to_size

Source: MISC
Type: Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2036024

Source: XF
Type: UNKNOWN
linux-kernel-cve20214159-info-disc(234277)

Source: MISC
Type: Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security update

Source: MISC
Type: Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-4159

Source: CCN
Type: Linux Kernel Web site
The Linux Kernel Archives

Source: CCN
Type: Mend Vulnerability Database
CVE-2021-4159

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.7)

  • Configuration 2:
  • cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

  • Configuration 3:
  • cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:5.6.0:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:102124
    P
    Security update for the Linux Kernel (Critical)
    2022-02-10
    oval:org.opensuse.security:def:1563
    P
    Security update for the Linux Kernel (Critical)
    2022-02-10
    BACK
    linux linux kernel *
    redhat enterprise linux 8.0
    debian debian linux 10.0
    linux linux kernel 5.6.0