CVE-2025-39819

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Source
https://cve.org/CVERecord?id=CVE-2025-39819
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39819.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39819
Downstream
Related
Published
2025-09-16T13:00:19.320Z
Modified
2026-03-20T12:43:04.514551Z
Summary
fs/smb: Fix inconsistent refcnt update
Details

In the Linux kernel, the following vulnerability has been resolved:

fs/smb: Fix inconsistent refcnt update

A possible inconsistent update of refcount was identified in smb2_compound_op. Such inconsistent update could lead to possible resource leaks.

Why it is a possible bug: 1. In the comment section of the function, it clearly states that the reference to cfile should be dropped after calling this function. 2. Every control flow path would check and drop the reference to cfile, except the patched one. 3. Existing callers would not handle refcount update of cfile if -ENOMEM is returned.

To fix the bug, an extra goto label "out" is added, to make sure that the cleanup logic would always be respected. As the problem is caused by the allocation failure of vars, the cleanup logic between label "finished" and "out" can be safely ignored. According to the definition of function is_replayable_error, the error code of "-ENOMEM" is not recoverable. Therefore, the replay logic also gets ignored.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39819.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
a7d5c294628088781da9e91cbb034d61c3a71f71
Fixed
3fc11ff13fbc2749871d6ac2141685cf54699997
Fixed
4191ea1f0bb3e27d65c5dcde7bd00e709ec67141
Fixed
4735f5991f51468b85affb8366b7067248457a71
Fixed
cc82c6dff548f0066a51a6e577c7454e7d26a968
Fixed
ab529e6ca1f67bcf31f3ea80c72bffde2e9e053e

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39819.json"