In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
| Link | Tags |
|---|---|
| https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner | third party advisory |
| http://www.openwall.com/lists/oss-security/2021/06/21/1 | mailing list exploit third party advisory |
| https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db | third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html | issue tracking mailing list third party advisory |