CVE-2020-27170
Medium
Description
An issue was discovered in the Linux kernel before 5.11.8. 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, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.
SeverityMedium
CVSS4.7
Exploit probability—
Product
Linux Kernel
PublishedMar 20, 2021
First seenMar 20, 2021
How to fix
Update
- linux linux_kernel5.11.8 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 5.11.8 | 5.11.8 |
| fedoraproject fedora | 32, 33, 34 | — |
| canonical ubuntu_linux | 14.04, 16.04, 18.04, 20.04 | — |
| debian debian_linux | 9.0 | — |
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