GHSA-CHVX-FR8P-V654
Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98388"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-14T14:17:49Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: do_close_on_exec() before taking exec_update_lock\n\ndo_close_on_exec() currently happens while holding the exec_update_lock,\nwhich is used in a lot of places that access process state to\nsynchronize access checks.\nI recently added another such use of exec_update_lock, causing a\nregression.\n\ndo_close_on_exec() can block waiting for a reply from a filesystem.\nThat means a hung filesystem can block codepaths that use\nexec_update_lock; and it also means that a FUSE filesystem which\nattempts to inspect the calling process can deadlock.\n\nTo avoid such problems, move do_close_on_exec() before the\nexec_update_lock is taken, but after the FD table has been copied if\nnecessary.\n\nI have looked through all the calls between the old and new position of\nthe do_close_on_exec() call; there seems to be no file descriptor table\naccess in between.",
"id": "GHSA-chvx-fr8p-v654",
"modified": "2026-10-14T15:32:19Z",
"published": "2026-10-14T15:32:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98388"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d86cd6b709c39216e6ee5ea8f0fc4242bbb2b53"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19ddef61ee0a49782a60f8f497e50597ad5de2da"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3feb4020bfb7ccf0d347f27051639d25e19cd65d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/550feab5b01000ab314868b62211fb3ddfd600e8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5aacc19ba2b1faf84c4a2f2cf9a1784e03d1ff38"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/63be3d8511bdafa095cd14a393cbf3c58dbbb928"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/955973fff4a36d39a848b00cac1706863f568fe1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e780259b54e618ceb4763fbc21314acf3565e813"
}
],
"schema_version": "1.4.0",
"severity": []
}
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