CVE-2021-34907.8HighCWE-787

CVE-2021-3490: Linux kernel eBPF bitwise ops ALU32 bounds tracking

Linux · Linux kernel

Vendor fix available · Affected: Linux kernel · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

27.4%probability of exploitation in the next 30 days

98th percentile

050100

Higher than 98% of scored CVEs

7.8HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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).

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Linux · Linux kernelfrom trunk before v5.13-rc4; from linux-5.12.y before v5.12.4; from linux-5.11.y before v5.11.21; from linux-5.10.y before v5.10.37; from v5.7-rc1 before 5.7*

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Out-of-bounds Write · Memory Corruption
Vendor: Linux
Published: June 2021
Band: Likely to be exploited (10% or more), June 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2021-3490 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.