netfs: Fix zeropoint update where i_size > remote_i_size
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix zeropoint update where i_size > remote_i_size Fix the update of the zero point[*] by netfs_release_folio() when there is uncommitted data in the pagecache beyond the folio being released but the on-server EOF is in this folio (ie. i_size > remote_i_size). The update needs to limit zero_point to remote_i_size, not i_size as i_size is a local phenomenon reflecting updates made locally to the pagecache, not stuff written to the server. remote_i_size tracks the server's i_size. [*] The zero point is the file position from which we can assume that the server will just return zeros, so we can avoid generating reads. Note that netfs_invalidate_folio() probably doesn't need fixing as zero_point should be updated by setattr after truncation or fallocate. Found with: fsx -q -N 1000000 -p 10000 -o 128000 -l 600000 \ /xfstest.test/junk --replay-ops=junk.fsxops using the following as junk.fsxops: truncate 0x0 0x1bbae 0x82864 write 0x3ef2e 0xf9c8 0x1bbae write 0x67e05 0xcb5a 0x4e8f6 mapread 0x57781 0x85b6 0x7495f copy_range 0x5d3d 0x10329 0x54fac 0x7495f write 0x64710 0x1c2b 0x7495f mapread 0x64000 0x1000 0x7495f on cifs with the default cache option. It shows read-gaps on folio 0x64 failing with a short read (ie. it hits EOF) if the FMODE_READ check is commented out in netfs_perform_write(): if (//(file->f_mode & FMODE_READ) || netfs_is_cache_enabled(ctx)) { and no fscache. This was initially found with the gen
CVE-2026-64159
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-2026-64159
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": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "f706e3889ff75877ecb3abae5ad667dbc990331e",
"versionType": "git"
},
{
"status": "affected",
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "5afc2d9b86bed2e4d9e1ba467790cbc793223f98",
"versionType": "git"
},
{
"status": "affected",
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "5cd5207de519ef0c085f4f559adf5eefcb4c5202",
"versionType": "git"
},
{
"status": "affected",
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "4543a4d737944134a1394afe797622546fbcc98a",
"versionType": "git"
},
{
"status": "affected",
"version": "e2814004138a541110d4b2dc254a8f619c2c4ce0",
"versionType": "git"
},
{
"status": "affected",
"version": "6.10.8",
"lessThan": "6.11",
"versionType": "semver"
}
],
"programFiles": [
"fs/netfs/misc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/netfs/misc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64159
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46427 · Revision 1
- Added to Heist Feed
- Publisher date