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Vulnerability record · CVE-2026-53303 · published 26 June 2026

CVE-2026-53303: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.

7.1 CVSS 3.1 High EPSS 0.17% · top 94.7% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
6 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show() In f2fs_sbi_show(), the extension_list, extension_count and hot_ext_count are read without holding sbi->sb_lock. If a concurrent sysfs store modifies the extension list via f2fs_update_extension_list(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data. Fix this by holding sb_lock around the entire extension list read and format operation.

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/4b3a1bf4c2ffd4c9595d900ead78c9035894a025 Patch
https://git.kernel.org/stable/c/5909bedbed38c558bee7cb6758ceedf9bc3a9194 Patch
https://git.kernel.org/stable/c/cea15f66b7b68b2c50943a6660e0692c6635e4eb Patch
https://git.kernel.org/stable/c/d0e877810baf613b018fd9747440b9d4d9db1428 Patch
https://git.kernel.org/stable/c/d3ff0c121bbaef026df6248ab7ef6f0b068b0647 Patch
https://git.kernel.org/stable/c/ea3ab43a1f3cf2c7cecd75c8be1ee99a5e94a92e Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53303), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.