CVE - CVE-2022-49993

CVE-ID
CVE-2022-49993	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b URL:https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b MISC:https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42 URL:https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42 MISC:https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf URL:https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf MISC:https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15 URL:https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15 MISC:https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7 URL:https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7 MISC:https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369 URL:https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369 MISC:https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede URL:https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede MISC:https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3 URL:https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3
Assigning CNA
kernel.org
Date Record Created
20250618	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250618)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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