CVE-2026-53303
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.
Affected versions
Linux kernel versions
4.17
and later are affected. Fixed in
6.1.175,
6.6.141,
6.12.91,
6.18.33,
7.0.10,
7.1
and their respective stable series.
References
6 totalFrequently asked questions
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What is CVE-2026-53303?
CVE-2026-53303 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.17 onward and has been patched in 6.1.175, 6.6.141, 6.12.91 and others. CVE-2026-53303 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-53303?
Yes — CVE-2026-53303 has been patched. Fixed versions include 6.1.175, 6.6.141, 6.12.91 and others. If you are running Linux kernel 4.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-53303 actively exploited?
No — CVE-2026-53303 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.