mm: avoid overflows in dirty throttling logic
In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.
CVE-2024-42131
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-2024-42131
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": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "2b2d2b8766db028bd827af34075f221ae9e9efff",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "4d3817b64eda07491bdd86a234629fe0764fb42a",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "7a49389771ae7666f4dc3426e2a4594bf23ae290",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "a25e8536184516b55ef89ab91dd2eea429de28d2",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "c83ed422c24f0d4b264f89291d4fabe285f80dbc",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "bd16a7ee339aef3ee4c90cb23902afb6af379ea0",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "8e0b5e7f2895eccef5c2a0018b589266f90c4805",
"versionType": "git"
},
{
"status": "affected",
"version": "2da02997e08d3efe8174c7a47696e6f7cbe69ba9",
"lessThan": "385d838df280eba6c8680f9777bfa0d0bfe7e8b2",
"versionType": "git"
}
],
"programFiles": [
"mm/page-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": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.320",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.282",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.222",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.163",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.98",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.39",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.9.9",
"versionType": "semver",
"lessThanOrEqual": "6.9.*"
},
{
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/page-writeback.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-42131
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26672 · Revision 1
- Added to Heist Feed
- Publisher date