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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-39482

bcache: fix variable length array abuse in btree_iter

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.

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

  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 2c3d7b03b658dc8bfa6112b194b67b92a87e081baffected
  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 5a1922adc5798b7ec894cd3f197afb6f9591b023affected
  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 934e1e4331859183a861f396d7dfaf33cb5afb02affected
  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 6479b9f41583b013041943c4602e1ad61cec8148affected
  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 0c31344e22dd8d6b1394c6e4c41d639015bdc671affected
  • cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31affected

Linux Linux

Default version status: affected

  • 3.10affected
  • 0 to < 3.10unaffected
  • 5.10.221 to ≤ 5.10.*unaffected
  • 5.15.162 to ≤ 5.15.*unaffected
  • 6.1.94 to ≤ 6.1.*unaffected
  • 6.6.34 to ≤ 6.6.*unaffected
  • 6.9.5 to ≤ 6.9.*unaffected
  • 6.10 to ≤ *unaffected

References