cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 3 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths In cifs_close_deferred_file(), cifs_close_all_deferred_files(), and cifs_close_deferred_file_under_dentry(), when a pending deferred close is cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to add the file to the local processing list may fail under memory pressure. The loop breaks immediately, but the cancelled work is no longer pending (it would have called _cifsFileInfo_put()), and the cfile is never added to file_head for processing. The cifsFileInfo reference and the open server handle both leak. Fix by saving the cfile that failed allocation in a local variable, breaking as before, and calling _cifsFileInfo_put() on it after releasing the lock. Any files later in the iteration are unaffected since their deferred work is still pending and will fire normally.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.1.6, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux for NVIDIA 26 | Affected | No fix planned: Out of support scope |
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-68312
- 2026-10-03 Alias added: GHSA-cm4r-jfcj-c3ff
- 2026-10-16 Fix available: Linux/[email protected], Linux/Linux@6089f561e2c31a3ba52836c75c7d2ab50d2eea41 · CNA
- 2026-10-16 1 new reference · CNA
- 2026-10-21 Fix available: Linux/[email protected], Linux/[email protected], Linux/Linux@7af7ec3af091f55d01f0ebe0246d10e37f358311 +1 · CNA
- 2026-10-21 2 new references · CNA
- 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@75143abc21f627da7ee3b0336814bd702692e830 · CNA
- 2026-10-30 1 new reference · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 6
- https://git.kernel.org/stable/c/75143abc21f627da7ee3b0336814bd702692e830
- https://git.kernel.org/stable/c/c968b2417f6a15d35ff4b97d534af4a126cb510b
- https://git.kernel.org/stable/c/7af7ec3af091f55d01f0ebe0246d10e37f358311
- https://git.kernel.org/stable/c/6089f561e2c31a3ba52836c75c7d2ab50d2eea41
- https://git.kernel.org/stable/c/32390b3f06f26e366cfb27dbac4bc0196c321535
- https://git.kernel.org/stable/c/c2f2e83e3bbc5483730fd4ee903182761f1ae50f
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Sources
- CVE-2026-68312 · CVE Program
- CVE-2026-68312 · NVD
- FIRST EPSS
- GHSA-cm4r-jfcj-c3ff · GitHub Advisory Database · CC BY 4.0
- CVE-2026-68312 · Red Hat security data · CC BY 4.0
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