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Vulnerabilities

Vulnerability · CVE-2025-40220

In the Linux kernel, the following vulnerability has been resolved: fuse: fix livelock in synchronous file put from fuseblk workers I observed a hang when running generic/323 again

Published Dec 4, 2025 · catalog updated May 23, 2026 · Linux Linux

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-40220. EPSS is 0.19%. 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
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.19%
Remediation
Version ranges on file
Affected products
vendor Linux Linux 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a

In the Linux kernel, the following vulnerability has been resolved: fuse: fix livelock in synchronous file put from fuseblk workers I observed a hang when running generic/323 against a fuseblk server. This test opens a file, initiates a lot of AIO writes to that file descriptor, and closes the file descriptor before the writes complete. Unsurprisingly, the AIO exerciser threads are mostly stuck waiting for responses from the fuseblk server: # cat /proc/372265/task/372313/stack [ ] request_wait_answer+0x1fe/0x2a0 [fuse] [ ] __fuse_simple_request+0xd3/0x2b0 [fuse] [ ] fuse_do_getattr+0xfc/0x1f0

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 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a

How to fix CVE-2025-40220

  • Upgrade

    CVE-2025-40220 lists a fix boundary at b26923512dbe57ae4917bafd31396d22a9d1691a. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a

  • 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-2025-40220. EPSS is 0.19%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a 5a18ec176c934ca1bc9dc61580a5e0e90a9b5733 <b26923512dbe57ae4917bafd31396d22a9d1691a. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.19%. 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. Dec 4, 2025 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: fuse: fix livelock in synchronous file put from fuseblk workers I observed a hang when running generic/323 against a fuseblk server. This test opens a file, initiates a lot of AIO writes to that file descriptor, and closes the file descriptor before the writes complete. Unsurprisingly, the AIO exerciser threads are mostly stuck wa

  2. May 23, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: fuse: fix livelock in synchronous file put from fuseblk workers I observed a hang when running generic/323 against a fuseblk server. This test opens a file, initiates a lot of AIO writes to that file descriptor, and closes the file descriptor before the writes complete. Unsurprisingly, the AIO exerciser threads are mostly stuck wa

Sources

  • CVE.orgVulnerability recordCVE-2025-40220

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-40220

    30-day exploitation probability 0.19%

    first.org
  • EUVDVulnerability recordEUVD-2025-201183

    In the Linux kernel, the following vulnerability has been resolved: fuse: fix livelock in synchronous file put from fuseblk workers I observed a hang when running generic/323 against a fuseblk server. This test opens a file, initiates a lot of AIO writes to that file descriptor,

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 1, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026