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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-46744

Squashfs: sanity check symbolic link size

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < f82cb7f24032ed023fc67d26ea9bf322d8431a90affected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < 1b9451ba6f21478a75288ea3e3fca4be35e2a438affected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < 5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4affected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < 087f25b2d36adae19951114ffcbb7106ed405ebbaffected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < fac5e82ab1334fc8ed6ff7183702df634bd1d93daffected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < c3af7e460a526007e4bed1ce3623274a1a6afe5eaffected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < ef4e249971eb77ec33d74c5c3de1e2576faf6c90affected
  • 6545b246a2c815a8fcd07d58240effb6ec3481b1 to < 810ee43d9cd245d138a2733d87a24858a23f577daffected

Linux Linux

Default version status: affected

  • 2.6.29affected
  • 0 to < 2.6.29unaffected
  • 4.19.322 to ≤ 4.19.*unaffected
  • 5.4.284 to ≤ 5.4.*unaffected
  • 5.10.226 to ≤ 5.10.*unaffected
  • 5.15.167 to ≤ 5.15.*unaffected
  • 6.1.110 to ≤ 6.1.*unaffected
  • 6.6.51 to ≤ 6.6.*unaffected
  • 6.10.10 to ≤ 6.10.*unaffected
  • 6.11 to ≤ *unaffected

References