CVE-2022-49348

{"id": "CVE-2022-49348", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-02-26T07:01:11.533", "references": [{"url": "https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state\n\nThe EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that\nwe are in the middle of replay the fast commit journal. This was\nactually a mistake, since the sbi->s_mount_info is initialized from\nes->s_state. Arguably s_mount_state is misleadingly named, but the\nname is historical --- s_mount_state and s_state dates back to ext2.\n\nWhat should have been used is the ext4_{set,clear,test}_mount_flag()\ninline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags.\n\nThe problem with using EXT4_FC_REPLAY is that a maliciously corrupted\nsuperblock could result in EXT4_FC_REPLAY getting set in\ns_mount_state. This bypasses some sanity checks, and this can trigger\na BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter\nout the EXT4_FC_REPLAY bit for now. We should eventually transition\naway from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: filtrar EXT4_FC_REPLAY del campo s_state del superbloque en disco El bit EXT4_FC_REPLAY en sbi->s_mount_state se usa para indicar que estamos en medio de la reproducci\u00f3n del diario de confirmaci\u00f3n r\u00e1pida. En realidad, esto fue un error, ya que sbi->s_mount_info se inicializa desde es->s_state. Podr\u00eda decirse que s_mount_state tiene un nombre enga\u00f1oso, pero el nombre es hist\u00f3rico --- s_mount_state y s_state se remontan a ext2. Lo que se deber\u00eda haber usado son las funciones en l\u00ednea ext4_{set,clear,test}_mount_flag(), que establecen los bits EXT4_MF_* en sbi->s_mount_flags. El problema con el uso de EXT4_FC_REPLAY es que un superbloque da\u00f1ado maliciosamente podr\u00eda provocar que EXT4_FC_REPLAY se establezca en s_mount_state. Esto evita algunas comprobaciones de cordura y puede desencadenar un error en ext4_es_cache_extent(). Como soluci\u00f3n f\u00e1cil de implementar, filtre el bit EXT4_FC_REPLAY por ahora. Deber\u00edamos dejar de usar EXT4_FC_REPLAY para pasar a algo como EXT4_MF_REPLAY."}], "lastModified": "2025-10-21T12:17:52.447", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DB0B2C71-35B4-4946-8040-56348E759B48", "versionEndExcluding": "5.10.121", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20D41697-0E8B-4B7D-8842-F17BF2AA21E1", "versionEndExcluding": "5.15.46", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15E2DD33-2255-4B76-9C15-04FF8CBAB252", "versionEndExcluding": "5.17.14", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8E122216-2E9E-4B3E-B7B8-D575A45BA3C2", "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.18"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}