IT

Tracker / CVE-2023-53075

CVE-2023-53075

High 7.8

In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix invalid address access in lookup_rec() when index is 0 KASAN reported follow problem: BUG: KASAN: use-after-free in lookup_rec Read of size 8 at addr ffff000199270ff0 by task modprobe CPU: 2 Comm: modprobe Call trace: kasan_report __asan_load8 lookup_rec ftrace_location arch_check_ftrace_location check_kprobe_address_safe register_kprobe When checking pg->records[pg->index - 1].ip in lookup_rec(), it can get a pg which is newly added to ftrace_pages_start in ftrace_process_locs(). Before the first pg->index++, index is 0 and accessing pg->records[-1].ip will cause this problem. Don't check the ip when pg->index is 0.

Affected products and versions

linux linux_kernel
linux linux_kernel · 3.5 → 4.14.311
linux linux_kernel · 4.15 → 4.19.279
linux linux_kernel · 4.20 → 5.4.238
linux linux_kernel · 5.11 → 5.15.104
linux linux_kernel · 5.16 → 6.1.21
linux linux_kernel · 5.5 → 5.10.176
linux linux_kernel · 6.2 → 6.2.8

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References