dm array: validate array block headers on read
In the Linux kernel, the following vulnerability has been resolved: dm array: validate array block headers on read array_block_check() validates blocknr and csum and nothing else, while node_check(), next to it, has bounded the structural fields since both were written. dm_array_cursor_next() takes its loop bound from the on-disk nr_entries and element_at() is unguarded pointer arithmetic, so a count larger than the block holds keeps the cursor in one block while the index grows past it and the read walks off the dm-bufio buffer -- dm_cache_load_mappings() drives it once per cache block at activation. Check the header against itself: reject a zero value_size, require max_entries to equal calc_max_entries() for that value_size and block size, and require nr_entries to fit. Equality rather than an upper bound, since a count below the real capacity trips BUG_ON() in fill_ablock() and trim_ablock(). Metadata dm-array writes satisfies all three.
CVE-2026-89574
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-2026-89574
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": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
"lessThan": "0e3b8f371c385c212b6e6f76c66f5b3f5bcfea62",
"versionType": "git"
},
{
"status": "affected",
"version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
"lessThan": "67adda7ed5da3e3b64f5b9021a02c21fb374fd9c",
"versionType": "git"
},
{
"status": "affected",
"version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
"lessThan": "b33f76d33aaeacf3baf3370d8d64985169b36600",
"versionType": "git"
},
{
"status": "affected",
"version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
"lessThan": "9808ddffb4bc659352df3020cd84d9d864820ee5",
"versionType": "git"
},
{
"status": "affected",
"version": "6513c29f44f2cc970c0e9fecfe5a6526c3e73025",
"lessThan": "2965787723084835b18dfe993cd450ebf5bd4540",
"versionType": "git"
}
],
"programFiles": [
"drivers/md/persistent-data/dm-array.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/md/persistent-data/dm-array.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89574
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46684 · Revision 1
- Added to Heist Feed
- Publisher date