{
  "cveId": "CVE-2026-74307",
  "url": "https://patchblox.com/security/cve/CVE-2026-74307",
  "summary": "CVE-2026-74307 is fixed in 69 products on 1 platform, first by DEBIAN-CVE-2026-74307, released August 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ext4: validate donor file superblock early in EXT4_IOC_MOVE_EXT",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ext4: validate donor file superblock early in EXT4_IOC_MOVE_EXT  Reject the EXT4_IOC_MOVE_EXT ioctl early if the donor file does not belong to the same superblock as the original file.  Currently, this validation is performed inside ext4_move_extents() by mext_check_validity(), but only after lock_two_nondirectories() has already acquired the inode locks.  When the donor fd refers to a file on a different filesystem (e.g., overlayfs), this late validation creates a circular lock dependency:    CPU0 (overlayfs write)            CPU1 (ext4 ioctl)   ----                              ----   inode_lock(ovl_inode)                                     mnt_want_write_file(filp)                                       sb_start_write(ext4_sb)   [sb_writers]     backing_file_write_iter()       vfs_iter_write(real_file)         file_start_write(real_file)           sb_start_write(ext4_sb)   [blocked by freeze]                                     lock_two_nondirectories()                                       inode_lock(ovl_inode)     [blocked]  With a concurrent freeze operation holding sb_writers write side, this forms a deadlock cycle: CPU0 waits for freeze to complete, freeze waits for CPU1\u0027s sb_writers reader to exit, CPU1 waits for CPU0\u0027s inode lock.  Since EXT4_IOC_MOVE_EXT exchanges physical extents between two files, it fundamentally requires both files to reside on the same ext4 filesystem.  Moving the superblock check before any lock acquisition is both semantically correct and eliminates the circular dependency by ensuring that cross-filesystem donor fds are rejected before sb_writers or inode locks are taken.",
  "published": "2026-08-15T06:22:30Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00179,
  "epssPercentile": 0.07521,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74307",
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