{"id":"CVE-2022-49993","state":"PUBLISHED","title":"loop: Check for overflow while configuring loop","description":"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()'s\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 &config->info 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->lo_offset = info->lo_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->iomap.offset > iter->pos);\n\nThus, check for negative value during loop_set_status_from_info().\n\nBug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e","publishedAt":"2025-06-18T11:00:53.487Z","updatedAt":"2026-05-11T19:10:39.147Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18e28817cb516b39de6281f6db9b0618b2cc7b42","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"adf0112d9b8acb03485624220b4934f69bf13369","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a217715338fd48f72114725aa7a40e484a781ca7","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b40877b8562c5720d0a7fce20729f56b75a3dede","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6858933131d0dadac071c4d33335a9ea4b8e76cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"0455bef69028c65065f16bb04635591b2374249b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9be7fa7ead18a48940df7b59d993bbc8b9055c15","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c490a0b5a4f36da3918181a8acdc6991d967c5f3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/loop.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"4.9.327","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.292","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.312","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.274","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.140","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.64","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.6","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/loop.c"]}],"references":["https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42","https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369","https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7","https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede","https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf","https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b","https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15","https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49993.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49993","state":"PUBLISHED","datePublished":"2025-06-18T11:00:53.487Z","dateUpdated":"2026-05-11T19:10:39.147Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-06-18T10:57:27.387Z"},"containers":{"cna":{"title":"loop: Check for overflow while configuring loop","descriptions":[{"lang":"en","value":"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()'s\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 &config->info 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->lo_offset = info->lo_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->iomap.offset > iter->pos);\n\nThus, check for negative value during loop_set_status_from_info().\n\nBug report: https://syzkaller.appspot.com/bug?id=c620fe14aac810396d3c3edc9ad73848bf69a29e"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"18e28817cb516b39de6281f6db9b0618b2cc7b42","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"adf0112d9b8acb03485624220b4934f69bf13369","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a217715338fd48f72114725aa7a40e484a781ca7","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b40877b8562c5720d0a7fce20729f56b75a3dede","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6858933131d0dadac071c4d33335a9ea4b8e76cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"0455bef69028c65065f16bb04635591b2374249b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9be7fa7ead18a48940df7b59d993bbc8b9055c15","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c490a0b5a4f36da3918181a8acdc6991d967c5f3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/loop.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"4.9.327","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.292","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.312","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.274","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.140","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.64","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.6","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/loop.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/18e28817cb516b39de6281f6db9b0618b2cc7b42"},{"url":"https://git.kernel.org/stable/c/adf0112d9b8acb03485624220b4934f69bf13369"},{"url":"https://git.kernel.org/stable/c/a217715338fd48f72114725aa7a40e484a781ca7"},{"url":"https://git.kernel.org/stable/c/b40877b8562c5720d0a7fce20729f56b75a3dede"},{"url":"https://git.kernel.org/stable/c/6858933131d0dadac071c4d33335a9ea4b8e76cf"},{"url":"https://git.kernel.org/stable/c/0455bef69028c65065f16bb04635591b2374249b"},{"url":"https://git.kernel.org/stable/c/9be7fa7ead18a48940df7b59d993bbc8b9055c15"},{"url":"https://git.kernel.org/stable/c/c490a0b5a4f36da3918181a8acdc6991d967c5f3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:10:39.147Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.9.327"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.14.292"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.19.312"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.4.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}