bcache: fix variable length array abuse in btree_iter
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.
CVE-2024-39482
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-39482
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "2c3d7b03b658dc8bfa6112b194b67b92a87e081b",
"versionType": "git"
},
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "5a1922adc5798b7ec894cd3f197afb6f9591b023",
"versionType": "git"
},
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "934e1e4331859183a861f396d7dfaf33cb5afb02",
"versionType": "git"
},
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "6479b9f41583b013041943c4602e1ad61cec8148",
"versionType": "git"
},
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "0c31344e22dd8d6b1394c6e4c41d639015bdc671",
"versionType": "git"
},
{
"status": "affected",
"version": "cafe563591446cf80bfbc2fe3bc72a2e36cf1060",
"lessThan": "3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31",
"versionType": "git"
}
],
"programFiles": [
"drivers/md/bcache/bset.c",
"drivers/md/bcache/bset.h",
"drivers/md/bcache/btree.c",
"drivers/md/bcache/super.c",
"drivers/md/bcache/sysfs.c",
"drivers/md/bcache/writeback.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.221",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.162",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.94",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.34",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.9.5",
"versionType": "semver",
"lessThanOrEqual": "6.9.*"
},
{
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/md/bcache/bset.c",
"drivers/md/bcache/bset.h",
"drivers/md/bcache/btree.c",
"drivers/md/bcache/super.c",
"drivers/md/bcache/sysfs.c",
"drivers/md/bcache/writeback.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-39482
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26629 · Revision 1
- Added to Heist Feed
- Publisher date