CVE-2026-98388
Received
Received - Intake
Linux Kernel exec_update_lock Race Condition Fix
Vulnerability report for CVE-2026-98388, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: kernel.org
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | ae1e630bcaac739f625822078edbaea98366930d |
| Linux | Linux | d54f14655fd7d7b293698a8b6918563c4c0465e7 |
| Linux | Linux | bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9 |
| Linux | Linux | 7456ae990a9738962b33146916fabca62ae3d4e0 |
| Linux | Linux | 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4 |
| Linux | Linux | f9b4b03ccc9c69bf7f7298d4559906ebea7143b3 |
| Linux | Linux | 6650527444dadc63d84aa939d14ecba4fadb2f69 |
| Linux | Linux | 6650527444dadc63d84aa939d14ecba4fadb2f69 |
| Linux | Linux | c1cfd63326f5d09999134e9052c353faf738286e |
| Linux | Linux | 5.10.261 |
| Linux | Linux | 5.15.212 |
| Linux | Linux | 6.1.178 |
| Linux | Linux | 6.6.145 |
| Linux | Linux | 6.12.97 |
| Linux | Linux | 6.18.40 |
| Linux | Linux | 7.1.4 |
| Linux | Linux | 7.2 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
