Out-of-bounds Read in Linux Kernel
CVE-2021-29155
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.
Vulnerability class: Buffer Overflow
EPSS: 0.011 (61.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Linux Linux_kernel
- Debian Debian_linux — versions 9.0
- Fedoraproject Fedora — versions 32, 33, 34
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Vendor Advisory)
- cve@mitre.org (Patch, Mailing List, Third Party Advisory)
- cve@mitre.org (vendor-advisory)
- cve@mitre.org (vendor-advisory)
- cve@mitre.org (vendor-advisory)
- cve@mitre.org (mailing-list, Mailing List, Third Party Advisory)
- cve@mitre.org
- cve@mitre.org
- cve@mitre.org
- cve@mitre.org
Frequently asked questions
- What is CVE-2021-29155?
- CVE-2021-29155 is a medium-severity vulnerability in Linux Kernel, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2021-04-20.
- How severe is CVE-2021-29155?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-29155 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.