{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-06T13:49:52.490","vulnerabilities":[{"cve":{"id":"CVE-2022-49771","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-05-01T15:16:00.237","lastModified":"2025-11-07T18:25:22.217","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm ioctl: fix misbehavior if list_versions races with module loading\n\n__list_versions will first estimate the required space using the\n\"dm_target_iterate(list_version_get_needed, &needed)\" call and then will\nfill the space using the \"dm_target_iterate(list_version_get_info,\n&iter_info)\" call. Each of these calls locks the targets using the\n\"down_read(&_lock)\" and \"up_read(&_lock)\" calls, however between the first\nand second \"dm_target_iterate\" there is no lock held and the target\nmodules can be loaded at this point, so the second \"dm_target_iterate\"\ncall may need more space than what was the first \"dm_target_iterate\"\nreturned.\n\nThe code tries to handle this overflow (see the beginning of\nlist_version_get_info), however this handling is incorrect.\n\nThe code sets \"param->data_size = param->data_start + needed\" and\n\"iter_info.end = (char *)vers+len\" - \"needed\" is the size returned by the\nfirst dm_target_iterate call; \"len\" is the size of the buffer allocated by\nuserspace.\n\n\"len\" may be greater than \"needed\"; in this case, the code will write up\nto \"len\" bytes into the buffer, however param->data_size is set to\n\"needed\", so it may write data past the param->data_size value. The ioctl\ninterface copies only up to param->data_size into userspace, thus part of\nthe result will be truncated.\n\nFix this bug by setting \"iter_info.end = (char *)vers + needed;\" - this\nguarantees that the second \"dm_target_iterate\" call will write only up to\nthe \"needed\" buffer and it will exit with \"DM_BUFFER_FULL_FLAG\" if it\noverflows the \"needed\" space - in this case, userspace will allocate a\nlarger buffer and retry.\n\nNote that there is also a bug in list_version_get_needed - we need to add\n\"strlen(tt->name) + 1\" to the needed size, not \"strlen(tt->name)\"."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm ioctl: se corrige el comportamiento incorrecto si list_versions se acelera al cargar módulos. __list_versions primero estimará el espacio requerido mediante la llamada \"dm_target_iterate(list_version_get_needed, &needed)\" y luego llenará el espacio mediante la llamada \"dm_target_iterate(list_version_get_info, &iter_info)\". Cada una de estas llamadas bloquea los destinos mediante las llamadas \"down_read(&_lock)\" y \"up_read(&_lock)\". Sin embargo, entre la primera y la segunda llamada \"dm_target_iterate\" no se mantiene el bloqueo y los módulos de destino se pueden cargar en este punto, por lo que la segunda llamada \"dm_target_iterate\" podría necesitar más espacio que el devuelto por la primera llamada \"dm_target_iterate\". El código intenta gestionar este desbordamiento (véase el comienzo de list_version_get_info), pero esta gestión es incorrecta. El código establece \"param->data_size = param->data_start + needed\" y \"iter_info.end = (char *)vers+len\": \"needed\" es el tamaño devuelto por la primera llamada a dm_target_iterate; \"len\" es el tamaño del búfer asignado por el espacio de usuario. \"len\" puede ser mayor que \"needed\"; en este caso, el código escribirá hasta \"len\" bytes en el búfer; sin embargo, param->data_size se establece en \"needed\", por lo que podría escribir datos que superen el valor de param->data_size. La interfaz ioctl solo copia hasta param->data_size en el espacio de usuario, por lo que parte del resultado se truncará. Corrija este error estableciendo \"iter_info.end = (char *)vers + needed;\" Esto garantiza que la segunda llamada \"dm_target_iterate\" solo escriba hasta el búfer necesario y finalice con \"DM_BUFFER_FULL_FLAG\" si se desborda dicho espacio. En este caso, el espacio de usuario asignará un búfer mayor y reintentará. Tenga en cuenta que también hay un error en list_version_get_needed: debemos agregar \"strlen(tt->name) + 1\" al tamaño necesario, no \"strlen(tt->name)\"."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":4.7,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.0,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-362"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.9.334","matchCriteriaId":"65416FEB-3A76-4DA9-A96A-1479EC77AFB6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"4.14.300","matchCriteriaId":"424802D2-E9E7-48A9-AD6F-DF2227B3D83A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"4.19.267","matchCriteriaId":"A5C69A12-68E2-400E-9A5A-375A673C8402"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.225","matchCriteriaId":"94D21814-3051-4860-AB06-C7880A3D4933"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.156","matchCriteriaId":"E2152F3D-E6D3-405D-B0BE-911B8B6E2EE6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.80","matchCriteriaId":"51BBEF3B-79F5-4D4C-ADBA-F34DA0E2465C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.0.10","matchCriteriaId":"64F9ADD1-3ADB-4D66-A00F-4A83010B05F0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*","matchCriteriaId":"E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*","matchCriteriaId":"17F0B248-42CF-4AE6-A469-BB1BAE7F4705"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*","matchCriteriaId":"E2422816-0C14-4B5E-A1E6-A9D776E5C49B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*","matchCriteriaId":"1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*","matchCriteriaId":"35B26BE4-43A6-4A36-A7F6-5B3F572D9186"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0c8d4112df329bf3dfbf27693f918c3b08676538","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/3a1c35d72dc0b34d1e746ed705790c0f630aa427","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/4fe1ec995483737f3d2a14c3fe1d8fe634972979","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/5398b8e275bf81a2517b327d216c0f37ac9ac5ae","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/6a818db0d5aecf80d4ba9e10ac153f60adc629ca","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/6ffce7a92ef5c68f7e5d6f4d722c2f96280c064b","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/b545c0e1e4094d4de2bdfe9a3823f9154b0c0005","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f59f5a269ca5e43c567aca7f1f52500a0186e9b7","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]}]}}]}