CVE-2026-63818

CVE CVE-2026-63818EUVD EUVD-2026-45484Published 2026-07-19T12:02:17.000ZLast changed 2026-08-05T12:36:04.000ZCVSS 8.4

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.6.145; patch: 7.1.3; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <210c210c92d78fdf5051bc55c5c69044b1a2150a; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <ad101d15716f5a24d1fa82a849f80430c805a3dd; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <8aad54746c251f2c2370118df766c0c82e2d2091; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <846c499a65816d13f1186e3090e825e8bb8bcb8b; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <550511a2470f6d204fa07b331f048bd2d3c51280; patch: 6.18.38; patch: 6.12.96; patch: 5.15.212; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <d2f236196d542ccd8505736e41c3a1d3f0305f6f; patch: 0; patch: 5.10.261; patch: 6.1.178; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70; 3.8; 127e670abfa7fa150f6550d620ded930f5bdb4e7 <2e12381d4495dc8b0ff042c6856022b2e359835c; patch: 7.2-rc1

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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