A vulnerability was found in the Linux kernel’s EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.
[
{
"product": "kernel",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "Fixed in v5.7-rc1"
}
]
}
]
access.redhat.com/security/cve/CVE-2021-4159
bugzilla.redhat.com/show_bug.cgi?id=2036024
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=294f2fc6da27620a506e6c050241655459ccd6bd
lists.debian.org/debian-lts-announce/2022/10/msg00000.html
security-tracker.debian.org/tracker/CVE-2021-4159