bcache: fix variable length array abuse in btree_iter
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.10.221, 5.15.162, 6.1.94, 6.6.34, 6.9.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 2c3d7b03b658dc8bfa6112b194b67b92a87e081b; From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 5a1922adc5798b7ec894cd3f197afb6f9591b023; From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 934e1e4331859183a861f396d7dfaf33cb5afb02; From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 6479b9f41583b013041943c4602e1ad61cec8148; From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 0c31344e22dd8d6b1394c6e4c41d639015bdc671; From cafe563591446cf80bfbc2fe3bc72a2e36cf1060 · fixed in 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31
- Linux Linux
3.10
- KernelLinux
From 3.10.0 · fixed in 5.10.221; From 5.11.0 · fixed in 5.15.162; From 5.16.0 · fixed in 6.1.94; From 6.2.0 · fixed in 6.6.34; From 6.7.0 · fixed in 6.9.5