iomap: adjust read range correctly for non-block-aligned positions
In the Linux kernel, the following vulnerability has been resolved: iomap: adjust read range correctly for non-block-aligned positions iomap_adjust_read_range() assumes that the position and length passed in are block-aligned. This is not always the case however, as shown in the syzbot generated case for erofs. This causes too many bytes to be skipped for uptodate blocks, which results in returning the incorrect position and length to read in. If all the blocks are uptodate, this underflows length and returns a position beyond the folio. Fix the calculation to also take into account the block offset when calculating how many bytes can be skipped for uptodate blocks.
CVE-2025-68794
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-2025-68794
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": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "ce20f49ac9194cf81a77f01d1c316d7c17ae753c",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "275b37a1e5c2c8abd313e8075f6aec9a349f291b",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaac",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "82b60ffbb532d919959702768dca04c3c0500ae5",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "142194fb21afe964d2d194cab1fc357cbf87e899",
"versionType": "git"
},
{
"status": "affected",
"version": "9dc55f1389f9569acf9659e58dd836a9c70df217",
"lessThan": "7aa6bc3e8766990824f66ca76c19596ce10daf3e",
"versionType": "git"
}
],
"programFiles": [
"fs/iomap/buffered-io.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.120",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/iomap/buffered-io.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-68794
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39124 · Revision 1
- Added to Heist Feed
- Publisher date