Kernel memory disclosure and crash via malformed F2FS
Published Dec 8, 2025 · Updated Aug 5, 2026
Out-of-bounds access in the Linux F2FS inode loader allows local users to read kernel memory, corrupt inode state, or crash the system. During F2FS inode loading, inline_data_addr uses attacker-controlled i_extra_isize and i_inline_xattr_size fields to index beyond the fixed i_addr array. A local user must cause a crafted F2FS image to be mounted and its inode accessed; the resulting access can expose adjacent kernel memory, corrupt inode state, or panic the kernel.
Summary
What happened
Out-of-bounds access in the Linux F2FS inode loader allows local users to read kernel memory, corrupt inode state, or crash the system. During F2FS inode loading, inline_data_addr uses attacker-controlled i_extra_isize and i_inline_xattr_size fields to index beyond the fixed i_addr array. A local user must cause a crafted F2FS image to be mounted and its inode accessed; the resulting access can expose adjacent kernel memory, corrupt inode state, or panic the kernel.
The record
- CVE
- CVE-2023-53763
- Published
- Dec 8, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.1.29 <6.1.53
- Affected versionversion=6.2.5 <6.3
- Affected versionversion=6.3
- Affected versionversion=85eb8b61dd4cfc7a839a0e86287b92ca6193444e <0d545a8e77cbd1fbad311b18952e38e0f7672ab4
- Affected versionversion=a3d1fd01250ffca88c11e9bd8d19be779acc7557
- Affected versionversion=d48a7b3a72f121655d95b5157c32c7d555e44c05 <958ccbbf1ce716d77c7cfa79ace50a421c1eed73
- Affected versionversion=d48a7b3a72f121655d95b5157c32c7d555e44c05 <bbb3cd66301ef752fae2922452660f228d69bcaf
- Affected versionversion=d48a7b3a72f121655d95b5157c32c7d555e44c05 <ea35767edc78327c686e21fe1231b668f11be0db
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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