CVE-2023-53075: linux kernel Use-After-Free — Fix

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
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	5.5 — 5.10.176
linux	linux_kernel	5.11 — 5.15.104
linux	linux_kernel	5.16 — 6.1.21
linux	linux_kernel	6.2 — 6.2.8
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2023-53075? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53075? +

CVE-2023-53075 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-53075? +

CVE-2023-53075 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-53075? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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