GHSA-4Q34-PQWJ-3CV6
Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-19 15:31In the Linux kernel, the following vulnerability has been resolved:
video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()
Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug in: drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info->var.pixclock) / hmul); with hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0. and then in: drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock); we'll get a division-by-zero.
The following log can reveal it:
divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline] RIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189
Fix this by checking the argument of ark_set_pixclock() first.
{
"affected": [],
"aliases": [
"CVE-2022-50102"
],
"database_specific": {
"cwe_ids": [
"CWE-369"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:39Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()\n\nSince the user can control the arguments of the ioctl() from the user\nspace, under special arguments that may result in a divide-by-zero bug\nin:\n drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info-\u003evar.pixclock) / hmul);\nwith hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0.\nand then in:\n drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par-\u003edac, 0, 1000000000 / pixclock);\nwe\u0027ll get a division-by-zero.\n\nThe following log can reveal it:\n\ndivide error: 0000 [#1] PREEMPT SMP KASAN PTI\nRIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline]\nRIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784\nCall Trace:\n fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034\n do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110\n fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189\n\nFix this by checking the argument of ark_set_pixclock() first.",
"id": "GHSA-4q34-pqwj-3cv6",
"modified": "2025-11-19T15:31:28Z",
"published": "2025-06-18T12:30:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50102"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0288fa799e273b08839037499d704dc7bdc13e9a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/15661642511b2b192077684a89f42a8d95d54286"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/236c1502520b7b08955467ec2e50b3232e34f1f9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2f1c4523f7a3aaabe7e53d3ebd378292947e95c8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ebc5031958c1f3a2795e4533b4091d77c738d14"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a249e1b89ca25e1c34bdf96154e3f6224a91a9af"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9a66f23612b84617e04412169e155a4b92f632d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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