CVE-2023-53075

ftrace: Fix invalid address access in lookup_rec() when index is 0

Description

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/2de28e5ce34b22b73b833a21e2c45ae3aade3964
https://git.kernel.org/stable/c/7569ee04b0e3b32df79f64db3a7138573edad9bc
https://git.kernel.org/stable/c/ac58b88ccbbb8e9fb83e137cee04a856b1ea6635
https://git.kernel.org/stable/c/83c3b2f4e7c61367c7b24551f4c6eb94bbdda283
https://git.kernel.org/stable/c/2a0d71fabfeb349216d33f001a6421b1768bd3a9
https://git.kernel.org/stable/c/4f84f31f63416b0f02fc146ffdc4ab32723eb7e8
https://git.kernel.org/stable/c/f1bd8b7fd890d87d0dc4dedc6287ea34dd07c0b4
https://git.kernel.org/stable/c/ee92fa443358f4fc0017c1d0d325c27b37802504

Frequently Asked Questions

What is the severity of CVE-2023-53075?: CVE-2023-53075 has not yet been assigned a CVSS score.
How to fix CVE-2023-53075?: To fix CVE-2023-53075, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-53075 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-53075 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-53075?: CVE-2023-53075 affects Linux Linux, Linux Linux.

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