GHSA-X3G2-QMP5-MX6F
Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 18:31In the Linux kernel, the following vulnerability has been resolved:
loop: Check for overflow while configuring loop
The userspace can configure a loop using an ioctl call, wherein a configuration of type loop_config is passed (see lo_ioctl()'s case on line 1550 of drivers/block/loop.c). This proceeds to call loop_configure() which in turn calls loop_set_status_from_info() (see line 1050 of loop.c), passing &config->info which is of type loop_info64*. This function then sets the appropriate values, like the offset.
loop_device has lo_offset of type loff_t (see line 52 of loop.c), which is typdef-chained to long long, whereas loop_info64 has lo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h).
The function directly copies offset from info to the device as follows (See line 980 of loop.c): lo->lo_offset = info->lo_offset;
This results in an overflow, which triggers a warning in iomap_iter() due to a call to iomap_iter_done() which has: WARN_ON_ONCE(iter->iomap.offset > iter->pos);
Thus, check for negative value during loop_set_status_from_info().
Bug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e
{
"affected": [],
"aliases": [
"CVE-2022-49993"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:26Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Check for overflow while configuring loop\n\nThe userspace can configure a loop using an ioctl call, wherein\na configuration of type loop_config is passed (see lo_ioctl()\u0027s\ncase on line 1550 of drivers/block/loop.c). This proceeds to call\nloop_configure() which in turn calls loop_set_status_from_info()\n(see line 1050 of loop.c), passing \u0026config-\u003einfo which is of type\nloop_info64*. This function then sets the appropriate values, like\nthe offset.\n\nloop_device has lo_offset of type loff_t (see line 52 of loop.c),\nwhich is typdef-chained to long long, whereas loop_info64 has\nlo_offset of type __u64 (see line 56 of include/uapi/linux/loop.h).\n\nThe function directly copies offset from info to the device as\nfollows (See line 980 of loop.c):\n\tlo-\u003elo_offset = info-\u003elo_offset;\n\nThis results in an overflow, which triggers a warning in iomap_iter()\ndue to a call to iomap_iter_done() which has:\n\tWARN_ON_ONCE(iter-\u003eiomap.offset \u003e iter-\u003epos);\n\nThus, check for negative value during loop_set_status_from_info().\n\nBug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e",
"id": "GHSA-x3g2-qmp5-mx6f",
"modified": "2025-11-14T18:31:23Z",
"published": "2025-06-18T12:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49993"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3"
}
],
"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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