IT

Tracker / CVE-2026-63818

CVE-2026-63818

High 8.4

In the Linux kernel, the following vulnerability has been resolved: f2fs: validate orphan inode entry count f2fs_recover_orphan_inodes() trusts the orphan block entry_count when replaying orphan inodes from the checkpoint pack. A corrupted entry_count larger than F2FS_ORPHANS_PER_BLOCK makes the recovery loop read past the ino[] array and interpret footer or following data as inode numbers. On a crafted image, mounting an unpatched kernel can drive orphan recovery into f2fs_bug_on() and panic the kernel. Validate entry_count before consuming entries so corrupted checkpoint data fails the mount with -EFSCORRUPTED and requests fsck instead. Set ERROR_INCONSISTENT_ORPHAN as well, so the corruption reason can be recorded in the superblock s_errors[] field. This gives fsck a persistent hint even though mount-time orphan recovery failure may leave no chance to persist SBI_NEED_FSCK through a checkpoint.

Affected products and versions

linux linux_kernel · 3.8 → 5.10.261
linux linux_kernel · 5.11 → 5.15.212
linux linux_kernel · 5.16 → 6.1.178
linux linux_kernel · 6.13 → 6.18.38
linux linux_kernel · 6.19 → 7.1.3
linux linux_kernel · 6.2 → 6.6.145
linux linux_kernel · 6.7 → 6.12.96

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References