ghsa-6cgq-9674-3xfg
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
fbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds
Add bounds checking to prevent writes past framebuffer boundaries when rendering text near screen edges. Return early if the Y position is off-screen and clip image height to screen boundary. Break from the rendering loop if the X position is off-screen. When clipping image width to fit the screen, update the character count to match the clipped width to prevent buffer size mismatches.
Without the character count update, bit_putcs_aligned and bit_putcs_unaligned receive mismatched parameters where the buffer is allocated for the clipped width but cnt reflects the original larger count, causing out-of-bounds writes.
{
"affected": [],
"aliases": [
"CVE-2025-40304"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-08T01:16:02Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Add bounds checking in bit_putcs to fix vmalloc-out-of-bounds\n\nAdd bounds checking to prevent writes past framebuffer boundaries when\nrendering text near screen edges. Return early if the Y position is off-screen\nand clip image height to screen boundary. Break from the rendering loop if the\nX position is off-screen. When clipping image width to fit the screen, update\nthe character count to match the clipped width to prevent buffer size\nmismatches.\n\nWithout the character count update, bit_putcs_aligned and bit_putcs_unaligned\nreceive mismatched parameters where the buffer is allocated for the clipped\nwidth but cnt reflects the original larger count, causing out-of-bounds writes.",
"id": "GHSA-6cgq-9674-3xfg",
"modified": "2025-12-08T03:31:01Z",
"published": "2025-12-08T03:31:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40304"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/15ba9acafb0517f8359ca30002c189a68ddbb939"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1943b69e87b0ab35032d47de0a7fca9a3d1d6fc1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2d1359e11674ed4274934eac8a71877ae5ae7bbb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3637d34b35b287ab830e66048841ace404382b67"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/86df8ade88d290725554cefd03101ecd0fbd3752"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/996bfaa7372d6718b6d860bdf78f6618e850c702"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ebc0730b490c7f27340b1222e01dd106e820320d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0982400648a3e00580253e0c48e991f34d2684c"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.