Vulnerability Name:

CVE-2021-46283 (CCN-217069)

Assigned:2021-06-09
Published:2021-06-09
Updated:2022-01-20
Summary:nf_tables_newset in net/netfilter/nf_tables_api.c in the Linux kernel before 5.12.13 allows local users to cause a denial of service (NULL pointer dereference and general protection fault) because of the missing initialization for nft_set_elem_expr_alloc. A local user can set a netfilter table expression in their own namespace.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
3.5 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-665
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-46283

Source: MISC
Type: Release Notes, Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13

Source: XF
Type: UNKNOWN
linux-kernel-cve202146283-dos(217069)

Source: CCN
Type: Linux Kernel GIT Repository
netfilter: nf_tables: initialize set before expression setup

Source: MISC
Type: Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad9f151e560b016b6ad3280b48e42fa11e1a5440

Source: MISC
Type: Third Party Advisory
https://syzkaller.appspot.com/bug?id=22c3987f75a7b90e238a26b5a5920525c2d1f345

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.12.13)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:5.12.12:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:102156
    P
    		Security update for the Linux Kernel (Important)
    2022-02-02
    oval:org.opensuse.security:def:1599
    P
    		Security update for the Linux Kernel (Important)
    2022-02-02
    oval:org.opensuse.security:def:42333
    P
    		Security update for the Linux Kernel (Important)
    2022-02-02
    oval:org.opensuse.security:def:1805
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:910
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:101844
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:99205
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:100408
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:42297
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:1176
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:101893
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:99479
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:102307
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:100742
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:1237
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:101986
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:99741
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:1751
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:102353
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:101612
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:1375
    P
    		Security update for the Linux Kernel (Important)
    2022-01-26
    oval:org.opensuse.security:def:100070
    P
    		 (Important)
    2022-01-26
    oval:org.opensuse.security:def:1560
    P
    		Security update for the Linux Kernel (Important)
    2022-01-25
    oval:org.opensuse.security:def:102122
    P
    		Security update for the Linux Kernel (Important)
    2022-01-25
    BACK
    linux linux kernel *
    linux linux kernel 5.12.12