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VulnerabilityPublished Updated

CVE-2026-68312: Linux kernel · cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths

Source GCVE Database

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Authoritative record:CVE-2026-68312· Medium

Not known to be exploited · fixed in c968b2417f6a15d35ff4b97d534af4a126cb510b : update Linux kernel when convenient.

Data as of 30 Oct 2026, 16:33 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in c968b2417f6a15d35ff4b97d534af4a126cb510b, c2f2e83e3bbc5483730fd4ee903182761f1ae50f, 75143abc21f627da7ee3b0336814bd702692e830 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < c968b2417f6a15d35ff4b97d534af4a126cb510b
Fixed in
  • c968b2417f6a15d35ff4b97d534af4a126cb510b
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < c2f2e83e3bbc5483730fd4ee903182761f1ae50f
Fixed in
  • c2f2e83e3bbc5483730fd4ee903182761f1ae50f
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < 75143abc21f627da7ee3b0336814bd702692e830
Fixed in
  • 75143abc21f627da7ee3b0336814bd702692e830
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < 32390b3f06f26e366cfb27dbac4bc0196c321535
Fixed in
  • 32390b3f06f26e366cfb27dbac4bc0196c321535
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < 6089f561e2c31a3ba52836c75c7d2ab50d2eea41
Fixed in
  • 6089f561e2c31a3ba52836c75c7d2ab50d2eea41
LinuxLinuxAffected
  • ≥ e3fc065682ebbbd15b0ce0036800f4acbf765d46, < 7af7ec3af091f55d01f0ebe0246d10e37f358311
Fixed in
  • 7af7ec3af091f55d01f0ebe0246d10e37f358311

Description

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.

References

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