VULNERABILITY INTELLIGENCE
CVE-2021-29155
CVSS score5.5 MEDIUM
EPSS probability1.07%
CISA KEVNot currently listed
Published2021-04-20
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Description
An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.
Weakness classification
- CWE-125: Out-of-bounds Read