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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-38415

Squashfs: check return result of sb_min_blocksize

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check return result of sb_min_blocksize Syzkaller reports an "UBSAN: shift-out-of-bounds in squashfs_bio_read" bug. Syzkaller forks multiple processes which after mounting the Squashfs filesystem, issues an ioctl("/dev/loop0", LOOP_SET_BLOCK_SIZE, 0x8000). Now if this ioctl occurs at the same time another process is in the process of mounting a Squashfs filesystem on /dev/loop0, the failure occurs. When this happens the following code in squashfs_fill_super() fails. ---- msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk->devblksize_log2 = ffz(~msblk->devblksize); ---- sb_min_blocksize() returns 0, which means msblk->devblksize is set to 0. As a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2 is set to 64. This subsequently causes the UBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') This commit adds a check for a 0 return by sb_min_blocksize().

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

  • 0aa666190509ffab81c202c5095a166be23961ac to < db7096ea160e40d78c67fce52e7cc51bde049497affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 549f9e3d7b60d53808c98b9fde49b4f46d0524a5affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 5c51aa862cbeed2f3887f0382a2708956710bd68affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 6abf6b78c6fb112eee495f5636ffcc350dd2ce25affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 4f99357dadbf9c979ad737156ad4c37fadf7c56baffected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 0aff95d9bc7fb5400ca8af507429c4b067bdb425affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282affected
  • 0aa666190509ffab81c202c5095a166be23961ac to < 734aa85390ea693bb7eaf2240623d41b03705c84affected

Linux Linux

Default version status: affected

  • 2.6.29affected
  • 0 to < 2.6.29unaffected
  • 5.4.295 to ≤ 5.4.*unaffected
  • 5.10.239 to ≤ 5.10.*unaffected
  • 5.15.186 to ≤ 5.15.*unaffected
  • 6.1.142 to ≤ 6.1.*unaffected
  • 6.6.94 to ≤ 6.6.*unaffected
  • 6.12.34 to ≤ 6.12.*unaffected
  • 6.15.3 to ≤ 6.15.*unaffected
  • 6.16 to ≤ *unaffected

References