CVE-2026-63818 Affecting linux-6.12 package, versions <6.12.100-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 Aug 2026
- disclosed19 Jul 2026
Introduced: 19 Jul 2026
CVE-2026-63818 (opens in a new tab)How to fix?
Upgrade Echo:latest linux-6.12 to version 6.12.100-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-63818
- https://www.cve.org/CVERecord?id=CVE-2026-63818
- https://git.kernel.org/stable/c/2e12381d4495dc8b0ff042c6856022b2e359835c
- https://git.kernel.org/stable/c/550511a2470f6d204fa07b331f048bd2d3c51280
- https://git.kernel.org/stable/c/846c499a65816d13f1186e3090e825e8bb8bcb8b
- https://git.kernel.org/stable/c/8aad54746c251f2c2370118df766c0c82e2d2091
- https://git.kernel.org/stable/c/210c210c92d78fdf5051bc55c5c69044b1a2150a
- https://git.kernel.org/stable/c/ad101d15716f5a24d1fa82a849f80430c805a3dd
- https://git.kernel.org/stable/c/d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70
- https://git.kernel.org/stable/c/d2f236196d542ccd8505736e41c3a1d3f0305f6f