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As reported by KASAN [1], LZ4_decompress_safe_partial\nmay lead to read out of bound problem during decoding. lz4 upstream has\nfixed it [2] and this issue has been disscussed here [3] before.\n\ncurrent decompression routine was ported from lz4 v1.8.3, bumping\nlib/lz4 to v1.9.+ is certainly a huge work to be done later, so, we'd\nbetter fix it first.\n\n[1] https://lore.kernel.org/all/000000000000830d1205cf7f0477@google.com/\n[2] https://github.com/lz4/lz4/commit/c5d6f8a8be3927c0bec91bcc58667a6cfad244ad#\n[3] https://lore.kernel.org/all/CC666AE8-4CA4-4951-B6FB-A2EFDE3AC03B@fb.com/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: lz4: arreglar LZ4_decompress_safe_partial lectura fuera de l\u00edmite Cuando se realiza una descodificaci\u00f3n parcial, es EOF si hemos llenado el b\u00fafer de salida o no podemos continuar con la lectura de un desplazamiento para la siguiente coincidencia. En algunos casos extremos, cuando los datos comprimidos est\u00e1n adecuadamente da\u00f1ados, se producir\u00e1 UAF. Como inform\u00f3 KASAN [1], LZ4_decompress_safe_partial puede provocar un problema de lectura fuera de l\u00edmite durante la descodificaci\u00f3n. lz4 upstream lo ha solucionado [2] y este problema se ha discutido aqu\u00ed [3] anteriormente. La rutina de descompresi\u00f3n actual se traslad\u00f3 de lz4 v1.8.3, actualizar lib/lz4 a v1.9.+ es sin duda un gran trabajo por hacer m\u00e1s adelante, as\u00ed que ser\u00e1 mejor que lo solucionemos primero. 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{"bugzilla": {"description": "kernel: lz4: fix LZ4_decompress_safe_partial read out of bound", "id": "2348091", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348091"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlz4: fix LZ4_decompress_safe_partial read out of bound\nWhen partialDecoding, it is EOF if we've either filled the output buffer\nor can't proceed with reading an offset for following match.\nIn some extreme corner cases when compressed data is suitably corrupted,\nUAF will occur. As reported by KASAN [1], LZ4_decompress_safe_partial\nmay lead to read out of bound problem during decoding. lz4 upstream has\nfixed it [2] and this issue has been disscussed here [3] before.\ncurrent decompression routine was ported from lz4 v1.8.3, bumping\nlib/lz4 to v1.9.+ is certainly a huge work to be done later, so, we'd\nbetter fix it first.\n[1] https://lore.kernel.org/all/000000000000830d1205cf7f0477@google.com/\n[2] https://github.com/lz4/lz4/commit/c5d6f8a8be3927c0bec91bcc58667a6cfad244ad#\n[3] https://lore.kernel.org/all/CC666AE8-4CA4-4951-B6FB-A2EFDE3AC03B@fb.com/"], "name": "CVE-2022-49078", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49078\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49078\nhttps://lore.kernel.org/linux-cve-announce/2025022656-CVE-2022-49078-df00@gregkh/T"], "threat_severity": "Moderate"}