In 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
References
Configurations
Configuration 1 (hide)
|
History
14 Nov 2025, 18:12
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b - Patch | |
| References | () https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42 - Patch | |
| References | () https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf - Patch | |
| References | () https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15 - Patch | |
| References | () https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7 - Patch | |
| References | () https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369 - Patch | |
| References | () https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede - Patch | |
| References | () https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3 - Patch |
Information
Published : 2025-06-18 11:15
Updated : 2025-11-14 18:12
NVD link : CVE-2022-49993
Mitre link : CVE-2022-49993
CVE.ORG link : CVE-2022-49993
JSON object : View
Products Affected
linux
- linux_kernel
CWE