CVE-2021-3490

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

27.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 98.0% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-06-04 01:40Z5 YR AGO

Last updated

2024-09-16 22:29Z2 YR AGO

Reserved

2021-04-09

Assigning CNA

canonical

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-787Out-of-bounds WriteBase
• CWE-125Out-of-bounds ReadBase
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.1

Document digest

ec37f31af0dc8d1e38d0817e6a6ac8e5fb0bc78f50dfede5f312f8a15e6401bc

• ubuntu.comhttps://ubuntu.com/security/notices/USN-4950-1vendor-advisoryx_refsource_UBUNTU
• ubuntu.comhttps://ubuntu.com/security/notices/USN-4949-1vendor-advisoryx_refsource_UBUNTU
• www.openwall.com[oss-security] CVE-2021-3490 - Linux kernel eBPF bitwise ops ALU32 bounds trackinghttps://www.openwall.com/lists/oss-security/2021/05/11/11mailing-listx_refsource_MLIST
• git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80ex_refsource_MISC
• www.zerodayinitiative.comhttps://www.zerodayinitiative.com/advisories/ZDI-21-606/x_refsource_MISC
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210716-0004/x_refsource_CONFIRM
• packetstormsecurity.comhttp://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.htmlx_refsource_MISC