smb: client: avoid leaking refcount when cifs_sb_tlink() fails
In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid leaking refcount when cifs_sb_tlink() fails cifs_oplock_break() takes over the reference that cifs_queue_oplock_break() acquired when it queued the work, and drops it with _cifsFileInfo_put() once the break has been processed. Only in setups with "-o multiuser", cifs_sb_tlink() may fail, at which point cifs_oplock_break() returns without putting the file reference, mirroring the reference leak we already fixed in the companion patch to cifs_queue_oplock_break(). This would trigger a crash due to busy inodes on the next unmount: BUG: Dentry ... still in use (1) [unmount of cifs cifs] VFS: Busy inodes after unmount of cifs (cifs) Drop the reference on that path as well. Doing so before the out label mirrors the normal path, which also puts the reference before cifs_done_oplock_break(). Found by Sashiko code review. The failure path was not exercised at runtime.
CVE-2026-97556
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-2026-97556
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": "5ee28bcfbaacf289eb25c662a2862542ea6ce6a7",
"lessThan": "55c5f095d4df14271b238f826e1392fda7b6e60e",
"versionType": "git"
},
{
"status": "affected",
"version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
"lessThan": "e9c5bcc88b8337157e480c85a6d2f326bc265012",
"versionType": "git"
},
{
"status": "affected",
"version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
"lessThan": "9ec991e148368e3207e98134c509a625097f7693",
"versionType": "git"
},
{
"status": "affected",
"version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
"lessThan": "dd03fd658ea59821505e0e643b6b7cbdf51c4e1d",
"versionType": "git"
},
{
"status": "affected",
"version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
"lessThan": "1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd",
"versionType": "git"
},
{
"status": "affected",
"version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
"lessThan": "23b26f4408ac3f35a482d2e5cf6fc865d4201b71",
"versionType": "git"
},
{
"status": "affected",
"version": "b99f490ea87ebcca3a429fd8837067feb56a4c7c",
"versionType": "git"
},
{
"status": "affected",
"version": "6b67a6d2e50634fe127e656147c81915955e9f5e",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.47",
"lessThan": "6.1.189",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.128",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.4.12",
"lessThan": "6.5",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/file.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"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/file.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97556
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38004 · Revision 1
- Added to Heist Feed
- Publisher date