smb: client: drain and invalidate before server-side copy/clone
In the Linux kernel, the following vulnerability has been resolved: smb: client: drain and invalidate before server-side copy/clone cifs_file_copychunk_range() and the clone (FICLONE) path of cifs_remap_file_range() do not serialise the destination page cache against the server-side copy the way the other server-side range operations (smb3_zero_range(), smb3_punch_hole(), smb3_collapse_range() and smb3_insert_range()) do. cifs_file_copychunk_range() invalidates the destination range with filemap_invalidate_inode(), which takes and drops the mapping's invalidate_lock internally, so the lock is no longer held when the copychunk ioctl is issued. It also never drains in-flight netfs I/O on the target. The clone path never takes the invalidate_lock at all (only i_rwsem), uses a bare truncate_inode_pages_range() and likewise does not drain outstanding I/O. As a result an asynchronous destination writeback can complete after the server-side copy/clone has run and reinstate stale data over the region just written by the server, corrupting the file. This is the same class of corruption as commit d7d2adcd022b ("smb/client: flush dirty data before punching a hole") and has been seen randomly in generic/363 against Windows Server. Fix both paths to follow the established ordering: hold the target mapping's invalidate_lock across the flush and invalidation of the destination and the server ioctl, and call netfs_wait_for_outstanding_io() on the target to drain in-flight writes before the i
CVE-2026-98682
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-2026-98682
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": "c54fc3a4f375663f2361a9cbb2955fb4ef912879",
"lessThan": "dc71660f11ef2fecc0695a41e49cd496a9d255ab",
"versionType": "git"
},
{
"status": "affected",
"version": "c54fc3a4f375663f2361a9cbb2955fb4ef912879",
"lessThan": "c9b1194e8ec99d95db25db45edd2fbf690f043ab",
"versionType": "git"
},
{
"status": "affected",
"version": "358bd5f436d820bb758833050aae065b35d6986c",
"versionType": "git"
},
{
"status": "affected",
"version": "43801359c8971cc49b4a4db5015fba77fbd09c32",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.68",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.7",
"lessThan": "6.7",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/cifsfs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/cifsfs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98682
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38684 · Revision 1
- Added to Heist Feed
- Publisher date