Vulnerability Name:

CVE-2021-3490 (CCN-201683)

Assigned:2021-05-11
Published:2021-05-11
Updated:2021-09-14
Summary:The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
7.2 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/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): High
Integrity (I): High
Availibility (A): High
8.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.8 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/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): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
7.2 High (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-125
CWE-787
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-3490

Source: MISC
Type: Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html

Source: XF
Type: UNKNOWN
linux-kernel-cve20213490-code-exec(201683)

Source: CCN
Type: Kernel GIT Repository
bpf: Fix alu32 const subreg bound tracking on bitwise operations

Source: MISC
Type: Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e

Source: CCN
Type: Packet Storm Security [09-01-2021]
Linux eBPF ALU32 32-bit Invalid Bounds Tracking Local Privilege Escalation

Source: CCN
Type: oss-sec Mailing List, Tue, 11 May 2021 14:56:47 -0300
CVE-2021-3490 - Linux kernel eBPF bitwise ops ALU32 bounds tracking

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210716-0004/

Source: UBUNTU
Type: Third Party Advisory
https://ubuntu.com/security/notices/USN-4949-1

Source: UBUNTU
Type: Third Party Advisory
https://ubuntu.com/security/notices/USN-4950-1

Source: MLIST
Type: Mailing List, Patch, Third Party Advisory
[oss-security] CVE-2021-3490 - Linux kernel eBPF bitwise ops ALU32 bounds tracking

Source: CCN
Type: ZDI-21-606
(Pwn2Own) Canonical Ubuntu eBPF Out-Of-Bounds Access Privilege Escalation Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-606/

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version >= 5.10 and < 5.10.37)
  • OR cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version >= 5.11 and < 5.11.21)
  • OR cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version >= 5.12 and < 5.12.4)
  • OR cpe:/o:linux:linux_kernel:5.13:-:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*

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

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8029
    P
    		kernel-docs-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7581
    P
    		libcaca-devel-0.99.beta19.git20171003-150200.11.9.1 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:7539
    P
    		kernel-64kb-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:8090
    P
    		reiserfs-kmp-default-5.14.21-150500.53.2 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:723
    P
    		Security update for postgresql14 (Important)
    2022-09-01
    oval:org.opensuse.security:def:3624
    P
    		Security update for curl (Important)
    2022-07-06
    oval:org.opensuse.security:def:3448
    P
    		busybox-1.21.1-3.3 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3453
    P
    		clamav-0.101.3-1.19 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3567
    P
    		libXtst6-1.2.2-7.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3398
    P
    		wpa_supplicant-2.6-15.10.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95197
    P
    		kernel-default-extra-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95028
    P
    		kernel-docs-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95078
    P
    		reiserfs-kmp-default-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2960
    P
    		kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95083
    P
    		kernel-azure-5.14.21-150400.12.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94590
    P
    		kernel-64kb-5.14.21-150400.22.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:6059
    P
    		Security update for ImageMagick (Important)
    2022-05-31
    oval:org.opensuse.security:def:6060
    P
    		Security update for mailman (Important)
    2022-05-31
    oval:org.opensuse.security:def:112507
    P
    		kernel-devel-5.14.6-1.4 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:105999
    P
    		kernel-devel-5.14.6-1.4 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:111583
    P
    		Security update for the Linux Kernel (Important)
    2021-07-11
    oval:org.opensuse.security:def:111584
    P
    		Security update for the Linux Kernel (Important)
    2021-07-11
    oval:org.opensuse.security:def:97146
    P
    		Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (Important)
    2021-06-29
    oval:org.opensuse.security:def:68339
    P
    		Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (Important)
    2021-06-29
    oval:org.opensuse.security:def:7250
    P
    		Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (Important)
    2021-06-29
    oval:org.opensuse.security:def:101901
    P
    		Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (Important)
    2021-06-29
    oval:org.opensuse.security:def:64713
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:102286
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:97070
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:100297
    P
    		 (Important)
    2021-06-15
    oval:org.opensuse.security:def:67559
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:74710
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:6470
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:1764
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:101868
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:70819
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:65642
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:8384
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:4553
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:102316
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:97071
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:100626
    P
    		 (Important)
    2021-06-15
    oval:org.opensuse.security:def:68337
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:76216
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:7248
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:101899
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:99649
    P
    		 (Important)
    2021-06-15
    oval:org.opensuse.security:def:67148
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:10679
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:101454
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:76217
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:99962
    P
    		 (Important)
    2021-06-15
    oval:org.opensuse.security:def:67149
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:73835
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:1543
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:101780
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    oval:org.opensuse.security:def:68670
    P
    		Security update for the Linux Kernel (Important)
    2021-06-15
    BACK
    linux linux kernel *
    linux linux kernel *
    linux linux kernel *
    linux linux kernel 5.13 -
    linux linux kernel 5.13 rc1
    linux linux kernel 5.13 rc2
    linux linux kernel 5.13 rc3
    canonical ubuntu linux 20.04
    canonical ubuntu linux 20.10
    canonical ubuntu linux 21.04
    linux linux kernel -