GHSA-W279-MJ9J-W893
Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-06-19 15:33In the Linux kernel, the following vulnerability has been resolved:
fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info
Hold state of deferred I/O in struct fb_deferred_io_state. Allocate an instance as part of initializing deferred I/O and remove it only after the final mapping has been closed. If the fb_info and the contained deferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info to invalidate the mapping. Any access will then result in a SIGBUS signal.
Fixes a long-standing problem, where a device hot-unplug happens while user space still has an active mapping of the graphics memory. The hot- unplug frees the instance of struct fb_info. Accessing the memory will operate on undefined state.
{
"affected": [],
"aliases": [
"CVE-2026-46065"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T14:17:27Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info\n\nHold state of deferred I/O in struct fb_deferred_io_state. Allocate an\ninstance as part of initializing deferred I/O and remove it only after\nthe final mapping has been closed. If the fb_info and the contained\ndeferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info\nto invalidate the mapping. Any access will then result in a SIGBUS\nsignal.\n\nFixes a long-standing problem, where a device hot-unplug happens while\nuser space still has an active mapping of the graphics memory. The hot-\nunplug frees the instance of struct fb_info. Accessing the memory will\noperate on undefined state.",
"id": "GHSA-w279-mj9j-w893",
"modified": "2026-06-19T15:33:13Z",
"published": "2026-05-27T15:33:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46065"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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