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CVE-2026-98388

exec: do_close_on_exec() before taking exec_update_lock

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From ae1e630bcaac739f625822078edbaea98366930d · fixed in 955973fff4a36d39a848b00cac1706863f568fe1; From d54f14655fd7d7b293698a8b6918563c4c0465e7 · fixed in 550feab5b01000ab314868b62211fb3ddfd600e8; From bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9 · fixed in 5aacc19ba2b1faf84c4a2f2cf9a1784e03d1ff38; From 7456ae990a9738962b33146916fabca62ae3d4e0 · fixed in 3feb4020bfb7ccf0d347f27051639d25e19cd65d; From 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4 · fixed in 0d86cd6b709c39216e6ee5ea8f0fc4242bbb2b53; From f9b4b03ccc9c69bf7f7298d4559906ebea7143b3 · fixed in 19ddef61ee0a49782a60f8f497e50597ad5de2da; From 6650527444dadc63d84aa939d14ecba4fadb2f69 · fixed in 63be3d8511bdafa095cd14a393cbf3c58dbbb928; From 6650527444dadc63d84aa939d14ecba4fadb2f69 · fixed in e780259b54e618ceb4763fbc21314acf3565e813; From 5.10.261 · fixed in 5.10.271; From 5.15.212 · fixed in 5.15.222; From 6.1.178 · fixed in 6.1.189; From 6.6.145 · fixed in 6.6.158; From 6.12.97 · fixed in 6.12.111; From 6.18.40 · fixed in 6.18.53; From 7.1.4 · fixed in 7.2

  • Linux Linux

    7.2

  • KernelLinux

    fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7

References 8

git.kernel.org