netfs: zero gaps in read-gaps folio to avoid writing back stale data
In the Linux kernel, the following vulnerability has been resolved: netfs: zero gaps in read-gaps folio to avoid writing back stale data netfs_read_gaps() leaves gaps around a streaming write's dirty region unread on the server side, so a short/EOF response there left stale folio content that later got written back. Zero it after the read completes, not before: netfs_wait_for_read() returns rreq->transferred once ret >= 0, so build an iterator over the same bvec array the read used, advance past ret, and zero the rest. The dirty region already maps to sink pages in that array rather than the real folio, so this can't touch it, and only the actual shortfall gets zeroed instead of the whole gap upfront.
CVE-2026-98843
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-2026-98843
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": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
"lessThan": "512eaf01ffabf4258e945016b50df5aed940b705",
"versionType": "git"
},
{
"status": "affected",
"version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
"lessThan": "2a62fe628a877c249c8286b157ee99d82840d9dc",
"versionType": "git"
},
{
"status": "affected",
"version": "ee4cdf7ba857a894ad1650d6ab77669cbbfa329e",
"lessThan": "8db55c5cd831a786a1a2a2d391aa80354535a353",
"versionType": "git"
}
],
"programFiles": [
"fs/netfs/buffered_read.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/netfs/buffered_read.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98843
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38750 · Revision 1
- Added to Heist Feed
- Publisher date