CVE-2023-52804 fs/jfs: Add validity check for db_maxag and db_agpref

What is CVE-2023-52804?

CVE-2023-52804 is a high-severity vulnerability in Linux kernel, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

fs/jfs: Add validity check for db_maxag and db_agpref

Both db_maxag and db_agpref are used as the index of the db_agfree array, but there is currently no validity check for db_maxag and db_agpref, which can lead to errors.

The following is related bug reported by Syzbot:

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20 index 7936 is out of range for type 'atomic_t[128]'

Add checking that the values of db_maxag and db_agpref are valid indexes for the db_agfree array.

Weakness: CWE-129

Which versions are affected by CVE-2023-52804?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-52804?

Apply the vendor's patch.

Is CVE-2023-52804 being exploited?

There is no known exploitation of CVE-2023-52804 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-52804, DEBIAN-CVE-2023-52804, GHSA-xhh8-8jq9-8vf6, UBUNTU-CVE-2023-52804.