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Vulnerability record · CVE-2026-23388 · published 25 March 2026

CVE-2026-23388: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check metadata block offset is within range Syzkaller reports a "general protection fault in squashfs_copy_data" This is ultimately caused by a corrupted index look-up table, which produces a negative metadata block offset. This is subsequently passed to squashfs_copy_data (via squashfs_read_metadata) where the negative offset causes an out of bounds access. The fix is to check that the offset is within range in squashfs_read_metadata. This will trap this and other cases.

7.1 CVSS 3.1 High EPSS 0.12% · top 98.4% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check metadata block offset is within range Syzkaller reports a "general protection fault in squashfs_copy_data" This is ultimately caused by a corrupted index look-up table, which produces a negative metadata block offset. This is subsequently passed to squashfs_copy_data (via squashfs_read_metadata) where the negative offset causes an out of bounds access. The fix is to check that the offset is within range in squashfs_read_metadata. This will trap this and other cases.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/01ee0bcc29864b78249308e8b35042b09bbf5fe3 Patch
https://git.kernel.org/stable/c/0c8ab092aec3ac4294940054772d30b511b16713 Patch
https://git.kernel.org/stable/c/3b9499e7d677dd4366239a292238489a804936b2 Patch
https://git.kernel.org/stable/c/3f68a9457a6190814377577374da75f872e0a013 Patch
https://git.kernel.org/stable/c/60f679f643f3f36a8571ea585e4ce5d93ef952b5 Patch
https://git.kernel.org/stable/c/6b847d65f5b0065e02080c61fad93d57d6686383 Patch
https://git.kernel.org/stable/c/9e9fa5ad37c9cbad73c165c7ff1e76e650825e7c Patch
https://git.kernel.org/stable/c/fdb24a820a5832ec4532273282cbd4f22c291a0d Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23388), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.