CVE-2022-49993: loop: Check for overflow while configuring loop
Vulnerability summary
CVE-2022-49993 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.9% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 7Timeline
- 18-06-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
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
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.25% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu112 products
- linuxAll versions (No fix recorded) | < 4.15.0-201.212 | < 5.4.0-132.148 | < 5.15.0-53.59
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1147.159 | < 5.4.0-1089.97 | < 5.15.0-1023.27
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 18e28817cb516b39de6281f6db9b0618b2cc7b42 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < adf0112d9b8acb03485624220b4934f69bf13369 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a217715338fd48f72114725aa7a40e484a781ca7 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b40877b8562c5720d0a7fce20729f56b75a3dede | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6858933131d0dadac071c4d33335a9ea4b8e76cf | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0455bef69028c65065f16bb04635591b2374249b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9be7fa7ead18a48940df7b59d993bbc8b9055c15 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c490a0b5a4f36da3918181a8acdc6991d967c5f3 | 2.6.12
- linux_kernel< 4.9.327 | ≥ 4.10, < 4.14.292 | ≥ 4.15, < 4.19.312 | ≥ 4.20, < 5.4.274 | ≥ 5.5, < 5.10.140 | ≥ 5.11, < 5.15.64 | ≥ 5.16, < 5.19.6 | 6.0:rc1 | 6.0:rc2
Debian1 product
- linux< 6.0.2-1
3 vendors · 115 products
