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CVE-2023-53485

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev Syzkaller reported the following issue: UBSAN: array-index-out…

Published Oct 1, 2025CWE-129EPSS 0.19%

Overview

CVE-2023-53485 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

fs: jfs: Fix UBSAN: array-index-out-of-bounds in dbAllocDmapLev

Syzkaller reported the following issue:

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:1965:6

index -84 is out of range for type 's8[341]' (aka 'signed char[341]')

CPU: 1 PID: 4995 Comm: syz-executor146 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106

ubsan_epilogue lib/ubsan.c:217 [inline]

__ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348

dbAllocDmapLev+0x3e5/0x430 fs/jfs/jfs_dmap.c:1965

dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1809

dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1350

dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:874

dtSplitUp fs/jfs/jfs_dtree.c:974 [inline]

dtInsert+0xda7/0x6b00 fs/jfs/jfs_dtree.c:863

jfs_create+0x7b6/0xbb

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0d9e678a82915633b99603f744e7735d1a673d72Refgit.kernel.org/stable/c/39f6292d75959e8accac0b3e24090094ba0824e9Refgit.kernel.org/stable/c/4e302336d5ca1767a06beee7596a72d3bdc8d983Refgit.kernel.org/stable/c/53b0a362aca2583729e8ca2936ca657ff3247d88Refgit.kernel.org/stable/c/6e7d9d76e5654bcdd3cdb7c9441a8113428ecebbRefgit.kernel.org/stable/c/911b48eec45152822bccf45cd3563b48256b1520Refgit.kernel.org/stable/c/bdf07ab1595b613b03f32dbb5cb379edfa1a7334Refgit.kernel.org/stable/c/f2af019091f904ca08b3572ab0111238ad6d17b3

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53485?

CVE-2023-53485 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53485?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53485?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53485?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53485 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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