dm-log: fix a bitset_size overflow on 32bit machines
In the Linux kernel, the following vulnerability has been resolved: dm-log: fix a bitset_size overflow on 32bit machines Commit c20e36b7631d ("dm log: fix out-of-bounds write due to region_count overflow") made sure that region_count could fit in an unsigned int. But the bitmap memory isn't allocated based on region_count. It uses bitset_size (a size_t variable). The first step of calculating bitset_size is to set it to region_count, rounded up to a multiple of BITS_PER_LONG. If region_size is less than BITS_PER_LONG smaller than UINT_MAX, it will get rounded up to 2^32. On a 32bit architecture, this will make bitset_size wrap around to 0 and fail, despite region_count being valid. Since bitset_size gets divided by 8, it can hold any valid region_count. It just needs a special case to handle the rollover. If it is 0, the value rolled over, and bitset size should be set to the number of bytes needed to hold 2^32 bits.
CVE-2026-72105
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-2026-72105
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": "44ab8875ae4a2842bde2d756bed195d375e0debb",
"lessThan": "cdc4ddf9db2cb79f4ab86b1a509b7ac21b0b6cf5",
"versionType": "git"
},
{
"status": "affected",
"version": "defe483e47173768c227532694dc78cb65db5f09",
"lessThan": "4b0de5a3ac1fd42acb0dc1f80ac5747e3287d723",
"versionType": "git"
},
{
"status": "affected",
"version": "3ec74da927b4e171a6fc0e77b1188ba4d019af51",
"lessThan": "567602fa72d57169365cbc589e0b8c3be900636d",
"versionType": "git"
},
{
"status": "affected",
"version": "d4ac87567f86a55c3c92e9a5144dcd943a9772a1",
"lessThan": "d05e0edfecf5260e6dddd28b2f0cce02bfc6ed7a",
"versionType": "git"
},
{
"status": "affected",
"version": "12bd5b88e91a02785244ff1d20fb157e96e9cdc8",
"lessThan": "1c3412b584e1fb6c665ff33ba7259253bc0082cb",
"versionType": "git"
},
{
"status": "affected",
"version": "b455903eed4558982be0811f5b7f44f6bbc4ff57",
"lessThan": "e0b0163a65758ec3a2361ae1cea407898c27f21e",
"versionType": "git"
},
{
"status": "affected",
"version": "c20e36b7631d83e7535877f08af8b0af72c44b1a",
"lessThan": "79feb87ab2396d49b9b65e4bb815d33cc71cba47",
"versionType": "git"
},
{
"status": "affected",
"version": "c20e36b7631d83e7535877f08af8b0af72c44b1a",
"lessThan": "9743132a41f4d9d0e54c5f2adcb821b04796bab1",
"versionType": "git"
},
{
"status": "affected",
"version": "4ec8323b9f0764a14d532b1ae9b87f8a9fecb867",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.258",
"lessThan": "5.10.261",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.209",
"lessThan": "5.15.212",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.175",
"lessThan": "6.1.178",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.141",
"lessThan": "6.6.145",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.91",
"lessThan": "6.12.97",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.33",
"lessThan": "6.18.40",
"versionType": "semver"
},
{
"status": "affected",
"version": "7.0.10",
"lessThan": "7.1",
"versionType": "semver"
}
],
"programFiles": [
"drivers/md/dm-log.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/md/dm-log.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72105
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41870 · Revision 1
- Added to Heist Feed
- Publisher date