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Vulnerabilities

Vulnerability · CVE-2026-98388

exec: do_close_on_exec() before taking exec_update_lock

Published Oct 14, 2026 · catalog updated Oct 18, 2026 · exec: do_close_on_exec() before taking

Check if you run it

No confirmed exploitation is on record for CVE-2026-98388. EPSS is 0.22%. Act only if a listed version of exec: do_close_on_exec() before taking is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (exec: do_close_on_exec() before taking).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.22%
Remediation
Not established
Affected products
Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting for a reply from a filesystem. That means a hung filesystem can block codepaths that use exec_update_lock; and it also means that a FUSE filesystem which attempts to inspect the calling process can deadlock. To avoid such problems, move do_close_on_exec() before the exec_update_lock is taken, but after the FD table has been copied if necessary. I have looked through all the calls between the old and new position of the do_close_on_exec() call; there seems to be no file descriptor table access in between.

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.

  • Linux Kernel0 → 5.10.271; 5.11.0 → 5.15.222; 5.16.0 → 6.1.189

How to fix CVE-2026-98388

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-2026-98388. EPSS is 0.22%. Act only if a listed version of exec: do_close_on_exec() before taking is installed.

Which versions are affected?

Compare what you have installed with Kernel 0 → 5.10.271; 5.11.0 → 5.15.222; 5.16.0 → 6.1.189. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.22%. 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. Oct 14, 2026 · Tenable CVE Database

    Detected

    In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting

  2. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    Kernel fixed in 5.10.271; Kernel fixed in 5.15.222; Kernel fixed in 6.1.189; Kernel fixed in 6.6.158

  3. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    Kernel fixed in 5.10.271; 5.11.0

  4. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting

Sources

  • CVE.orgVulnerability recordCVE-2026-98388

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-98388

    30-day exploitation probability 0.2%

    first.org
  • OpenSSF OSV / OSV ScannerPackage advisoryCVE-2026-98388

    exec: do_close_on_exec() before taking exec_update_lock

    osv.dev
  • Tenable CVE DatabaseVulnerability recordCVE-2026-98388

    In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting

    tenable.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.