What’s Vulnerable › Vulnerabilities

CVE-2026-89840: f2fs: validate MOVE_RANGE destination size

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: validate MOVE_RANGE destination size F2FS_IOC_MOVE_RANGE checks the source range, but not the destination end before updating i_size. A source hole can expose this: __clone_blkaddrs() skips NULL_ADDR entries and returns success, so the caller can still extend the destination inode with unchecked pos_out + len. Reject destination overflow and use inode_newsize_ok() before extending the destination inode.

Affected products

• Linux: 4.8 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/454de20a5a36c000b75f49337aae8c92045c5242
• https://git.kernel.org/stable/c/54c587f3f95ce2d6932a16566db83f73cc4313e1
• https://git.kernel.org/stable/c/bca61ee5192ea47003722486ae9588a2a4bb47b6
• https://git.kernel.org/stable/c/db13064669526494cd78ba3a4394063b740e940c
• https://git.kernel.org/stable/c/dcae1eeda53149f219dd6af93b3083b7271c1c63
• https://git.kernel.org/stable/c/e533889fc26aea0cd83c90327063f272061dd820

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