smb: client: avoid leaking refcount in cifs_queue_oplock_break()
In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid leaking refcount in cifs_queue_oplock_break() cifs_queue_oplock_break() unconditionally takes a reference on the target file before queueing cifs_oplock_break(). Only that work item decreases the reference counter again. If another oplock break arrives while that work is still queued, queue_work() will return false and not queue this second work item. As a result, we will never reach the point to drop the file reference again and are leaking this reference. This can be triggered when interacting with a slow-responding server. As a result, later unmount operations for this file system will fail with BUG: Dentry ... still in use (1) [unmount of cifs cifs] VFS: Busy inodes after unmount of cifs (cifs) kernel BUG at fs/super.c:777! Fix this by only incrementing the reference count if the work has been queued successfully. Taking it after queue_work() is safe because all three callers hold tcon->open_file_lock across the call and _cifsFileInfo_put() decrements under that same lock, so a worker that starts the handler in the window cannot drop the reference before it has been taken.
CVE-2026-97557
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-2026-97557
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": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "735a3a610136ae10f381d0909dff38e5b5c5f056",
"versionType": "git"
},
{
"status": "affected",
"version": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "de2a6bcff2659bea40c7485115b57f0ae189fc01",
"versionType": "git"
},
{
"status": "affected",
"version": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "af0193bbf1ac8c0f67f972998b0cc629d6116cf6",
"versionType": "git"
},
{
"status": "affected",
"version": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "2ed2c29dd9593637cfa25ac1eb23241b20202778",
"versionType": "git"
},
{
"status": "affected",
"version": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "dfe7b750c7e069873a8a57a11c816831a235618a",
"versionType": "git"
},
{
"status": "affected",
"version": "b98749cac4a695f084a5ff076f4510b23e353ecd",
"lessThan": "9f2e63f1b2d5fc5b5423424902c091123e220e7e",
"versionType": "git"
},
{
"status": "affected",
"version": "2429fcf06d3cb962693868ab0a927c9038f12a2d",
"versionType": "git"
},
{
"status": "affected",
"version": "1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12",
"versionType": "git"
},
{
"status": "affected",
"version": "53fc31a4853e30d6e8f142b824f724da27ff3e40",
"versionType": "git"
},
{
"status": "affected",
"version": "8092ecc306d81186a64cda42411121f4d35aaff4",
"versionType": "git"
},
{
"status": "affected",
"version": "ebac4d0adf68f8962bd82fcf483936edd6ec095b",
"versionType": "git"
},
{
"status": "affected",
"version": "3.16.72",
"lessThan": "3.17",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.9.171",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.14.114",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.37",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.0.10",
"lessThan": "5.1",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/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": "5.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/misc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97557
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38005 · Revision 1
- Added to Heist Feed
- Publisher date