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Linux Linux kernelLinux kernel eBPF bitwise ops ALU32 bounds tracking

Risk 67
Severity
7.8
Input Validation
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Last updated 4 July 2026

1 / 2
Source: Ubuntu
First published (updated )
CVE-2021-3490

Linux Linux kernelLinux kernel io_uring PROVIDE_BUFFERS MAX_RW_COUNT bypass

Risk 75
Severity
8.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Last updated 4 July 2026

1 / 3
Source: Ubuntu
First published (updated )
CVE-2021-3491

redhat/kernel-rtLinux kernel eBPF RINGBUF map oversized allocation

Risk 72
Severity
7.8
Buffer Overflow
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

A flaw out of bound memory write in the Linux kernel BPF subsystem was found in the way user writes to BPF ring buffer too fast, so larger buffer than available memory could be allocated. A local user could use this flaw to crash the system or possibly escalate their privileges on the system.

1 / 5
First published (updated )
CVE-2021-3489

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