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Vulnerabilities

Security research · CVE-2025-71074

In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_dat

Published Jan 13, 2026 · catalog updated Oct 21, 2026 · Linux Linux

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-71074. EPSS is 0.13%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.13%
Remediation
Version ranges on file
Affected products
vendor Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eee

In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynamic ones) and when it hits zero, dynamic files get removed. Unfortunately, that removal can happen while another thread is in ffs_epfile_open(), but has not incremented the count yet. In that case open will succeed, leaving us with UAF on any subsequent read() or write(). The root cause is that ffs->opened is misused; a

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eeeddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eee

How to fix CVE-2025-71074

  • Upgrade

    CVE-2025-71074 lists a fix boundary at e5bf5ee266633cb18fff6f98f0b7d59a62819eee. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eee

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-71074. EPSS is 0.13%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eee ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e5bf5ee266633cb18fff6f98f0b7d59a62819eee. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 13, 2026 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynamic ones) and when it hits zero, dynamic files get removed. Unfortunately, that removal can happen while another thread i

  2. Oct 21, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynamic ones) and when it hits zero, dynamic files get removed. Unfortunately, that removal can happen while another thread i

Sources

  • CVE.orgVulnerability recordCVE-2025-71074

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-71074

    30-day exploitation probability 0.13%

    first.org
  • EUVDVulnerability recordEUVD-2026-2275

    In the Linux kernel, the following vulnerability has been resolved: functionfs: fix the open/removal races ffs_epfile_open() can race with removal, ending up with file->private_data pointing to freed object. There is a total count of opened files on functionfs (both ep0 and dynam

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgOct 29, 2026
  • EUVDOct 28, 2026