Answer in brief
CVE-2026-63818 records a High severity (CVSS 8.4) vulnerability in f2fs: validate orphan inode entry count. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <210c210c92d78fdf5051bc55c5c69044b1a2150a || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <ad101d15716f5a24d1fa82a849f80430c805a3dd || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70 || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <d2f236196d542ccd8505736e41c3a1d3f0305f6f || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <550511a2470f6d204fa07b331f048bd2d3c51280 || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <8aad54746c251f2c2370118df766c0c82e2d2091 || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <2e12381d4495dc8b0ff042c6856022b2e359835c || >=127e670abfa7fa150f6550d620ded930f5bdb4e7 <846c499a65816d13f1186e3090e825e8bb8bcb8b | 210c210c92d78fdf5051bc55c5c69044b1a2150a, ad101d15716f5a24d1fa82a849f80430c805a3dd, d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70, d2f236196d542ccd8505736e41c3a1d3f0305f6f, 550511a2470f6d204fa07b331f048bd2d3c51280, 8aad54746c251f2c2370118df766c0c82e2d2091, 2e12381d4495dc8b0ff042c6856022b2e359835c, 846c499a65816d13f1186e3090e825e8bb8bcb8b |
| Linux/Linuxgeneric | 3.8 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.