CVEs-PoC/2020/CVE-2020-27170.md

CVE-2020-27170

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.

POC

Reference

• http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76
• https://www.openwall.com/lists/oss-security/2021/03/19/2

Github

• https://github.com/ARPSyndicate/cvemon