{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-47585", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:11:00.731Z", "datePublished": "2024-06-19T14:53:50.780Z", "dateUpdated": "2025-05-04T07:14:11.185Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:14:11.185Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in __add_inode_ref()\n\nLine 1169 (#3) allocates a memory chunk for victim_name by kmalloc(),\nbut  when the function returns in line 1184 (#4) victim_name allocated\nby line 1169 (#3) is not freed, which will lead to a memory leak.\nThere is a similar snippet of code in this function as allocating a memory\nchunk for victim_name in line 1104 (#1) as well as releasing the memory\nin line 1116 (#2).\n\nWe should kfree() victim_name when the return value of backref_in_log()\nis less than zero and before the function returns in line 1184 (#4).\n\n1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans,\n1058 \t\t\t\t  struct btrfs_root *root,\n1059 \t\t\t\t  struct btrfs_path *path,\n1060 \t\t\t\t  struct btrfs_root *log_root,\n1061 \t\t\t\t  struct btrfs_inode *dir,\n1062 \t\t\t\t  struct btrfs_inode *inode,\n1063 \t\t\t\t  u64 inode_objectid, u64 parent_objectid,\n1064 \t\t\t\t  u64 ref_index, char *name, int namelen,\n1065 \t\t\t\t  int *search_done)\n1066 {\n\n1104 \tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\n\t// #1: kmalloc (victim_name-1)\n1105 \tif (!victim_name)\n1106 \t\treturn -ENOMEM;\n\n1112\tret = backref_in_log(log_root, &search_key,\n1113\t\t\tparent_objectid, victim_name,\n1114\t\t\tvictim_name_len);\n1115\tif (ret < 0) {\n1116\t\tkfree(victim_name); // #2: kfree (victim_name-1)\n1117\t\treturn ret;\n1118\t} else if (!ret) {\n\n1169 \tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\n\t// #3: kmalloc (victim_name-2)\n1170 \tif (!victim_name)\n1171 \t\treturn -ENOMEM;\n\n1180 \tret = backref_in_log(log_root, &search_key,\n1181 \t\t\tparent_objectid, victim_name,\n1182 \t\t\tvictim_name_len);\n1183 \tif (ret < 0) {\n1184 \t\treturn ret; // #4: missing kfree (victim_name-2)\n1185 \t} else if (!ret) {\n\n1241 \treturn 0;\n1242 }"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-log.c"], "versions": [{"version": "d3316c8233bb05e0dd855d30aac347bb8ad76ee4", "lessThan": "005d9292b5b2e71a009f911bd85d755009b37242", "status": "affected", "versionType": "git"}, {"version": "d3316c8233bb05e0dd855d30aac347bb8ad76ee4", "lessThan": "493ff661d434d6bdf02e3a21adae04d7a0b4265d", "status": "affected", "versionType": "git"}, {"version": "d3316c8233bb05e0dd855d30aac347bb8ad76ee4", "lessThan": "f35838a6930296fc1988764cfa54cb3f705c0665", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/tree-log.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.88", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.11", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.10.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242"}, {"url": "https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d"}, {"url": "https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665"}], "title": "btrfs: fix memory leak in __add_inode_ref()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-24T18:08:01.516987Z", "id": "CVE-2021-47585", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-24T18:08:15.557Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.778Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665", "tags": ["x_transferred"]}]}]}}

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// #2: kfree (victim_name-1)\n1117\t\treturn ret;\n1118\t} else if (!ret) {\n\n1169 \tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\n\t// #3: kmalloc (victim_name-2)\n1170 \tif (!victim_name)\n1171 \t\treturn -ENOMEM;\n\n1180 \tret = backref_in_log(log_root, &search_key,\n1181 \t\t\tparent_objectid, victim_name,\n1182 \t\t\tvictim_name_len);\n1183 \tif (ret < 0) {\n1184 \t\treturn ret; // #4: missing kfree (victim_name-2)\n1185 \t} else if (!ret) {\n\n1241 \treturn 0;\n1242 }"}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T07:45:15.543Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47585", "state": "PUBLISHED", "dateUpdated": "2024-12-19T07:45:15.543Z", "dateReserved": "2024-05-24T15:11:00.731Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-06-19T14:53:50.780Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A657B2D0-5B9D-42BE-A3BF-228DBC1B057C", "versionEndExcluding": "5.10.88", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "11274E95-438A-449A-B100-01B2B0046669", "versionEndExcluding": "5.15.11", "versionStartIncluding": "5.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in __add_inode_ref()\n\nLine 1169 (#3) allocates a memory chunk for victim_name by kmalloc(),\nbut  when the function returns in line 1184 (#4) victim_name allocated\nby line 1169 (#3) is not freed, which will lead to a memory leak.\nThere is a similar snippet of code in this function as allocating a memory\nchunk for victim_name in line 1104 (#1) as well as releasing the memory\nin line 1116 (#2).\n\nWe should kfree() victim_name when the return value of backref_in_log()\nis less than zero and before the function returns in line 1184 (#4).\n\n1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans,\n1058 \t\t\t\t  struct btrfs_root *root,\n1059 \t\t\t\t  struct btrfs_path *path,\n1060 \t\t\t\t  struct btrfs_root *log_root,\n1061 \t\t\t\t  struct btrfs_inode *dir,\n1062 \t\t\t\t  struct btrfs_inode *inode,\n1063 \t\t\t\t  u64 inode_objectid, u64 parent_objectid,\n1064 \t\t\t\t  u64 ref_index, char *name, int namelen,\n1065 \t\t\t\t  int *search_done)\n1066 {\n\n1104 \tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\n\t// #1: kmalloc (victim_name-1)\n1105 \tif (!victim_name)\n1106 \t\treturn -ENOMEM;\n\n1112\tret = backref_in_log(log_root, &search_key,\n1113\t\t\tparent_objectid, victim_name,\n1114\t\t\tvictim_name_len);\n1115\tif (ret < 0) {\n1116\t\tkfree(victim_name); // #2: kfree (victim_name-1)\n1117\t\treturn ret;\n1118\t} else if (!ret) {\n\n1169 \tvictim_name = kmalloc(victim_name_len, GFP_NOFS);\n\t// #3: kmalloc (victim_name-2)\n1170 \tif (!victim_name)\n1171 \t\treturn -ENOMEM;\n\n1180 \tret = backref_in_log(log_root, &search_key,\n1181 \t\t\tparent_objectid, victim_name,\n1182 \t\t\tvictim_name_len);\n1183 \tif (ret < 0) {\n1184 \t\treturn ret; // #4: missing kfree (victim_name-2)\n1185 \t} else if (!ret) {\n\n1241 \treturn 0;\n1242 }"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: btrfs: corrige la p\u00e9rdida de memoria en __add_inode_ref() La l\u00ednea 1169 (#3) asigna un fragmento de memoria para victim_name mediante kmalloc(), pero cuando la funci\u00f3n regresa en la l\u00ednea 1184 (#4) victim_name asignado por la l\u00ednea 1169 (#3) no se libera, lo que provocar\u00e1 una p\u00e9rdida de memoria. Hay un fragmento de c\u00f3digo similar en esta funci\u00f3n para asignar un fragmento de memoria para victim_name en la l\u00ednea 1104 (n.\u00ba 1), as\u00ed como para liberar la memoria en la l\u00ednea 1116 (n.\u00ba 2). Deber\u00edamos kfree() victim_name cuando el valor de retorno de backref_in_log() sea menor que cero y antes de que la funci\u00f3n regrese en la l\u00ednea 1184 (#4). 1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans, 1058 struct btrfs_root *root, 1059 struct btrfs_path *path, 1060 struct btrfs_root *log_root, 1061 struct btrfs_inode *dir, 1062 struct btrfs_inode *inode, 63 u64 inode_objectid, u64 parent_objectid, 1064 u64 ref_index, char *nombre, int nombrelen, 1065 int *search_done) 1066 { 1104 nombre_v\u00edctima = kmalloc(nombre_v\u00edctima_len, GFP_NOFS); // #1: kmalloc (nombre_v\u00edctima-1) 1105 if (!nombre_v\u00edctima) 1106 return -ENOMEM; 1112 ret = backref_in_log(log_root, &amp;search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret &lt; 0) { 1116 kfree(nombre_v\u00edctima); // #2: kfree (nombre_v\u00edctima-1) 1117 return ret; 1118 } else if (!ret) { 1169 nombre_v\u00edctima = kmalloc(nombre_v\u00edctima_len, GFP_NOFS); // #3: kmalloc (nombre_v\u00edctima-2) 1170 if (!nombre_v\u00edctima) 1171 return -ENOMEM; 1180 ret = backref_in_log(log_root, &amp;search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 si (ret &lt; 0) { 1184 retorno ret; // #4: falta kfree (nombre_v\u00edctima-2) 1185 } else if (!ret) { 1241 return 0; 1242 }"}], "id": "CVE-2021-47585", "lastModified": "2024-11-21T06:36:36.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-06-19T15:15:53.057", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/005d9292b5b2e71a009f911bd85d755009b37242"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/493ff661d434d6bdf02e3a21adae04d7a0b4265d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f35838a6930296fc1988764cfa54cb3f705c0665"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix memory leak in __add_inode_ref()", "id": "2293243", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293243"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-404", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbtrfs: fix memory leak in __add_inode_ref()\nLine 1169 (#3) allocates a memory chunk for victim_name by kmalloc(),\nbut  when the function returns in line 1184 (#4) victim_name allocated\nby line 1169 (#3) is not freed, which will lead to a memory leak.\nThere is a similar snippet of code in this function as allocating a memory\nchunk for victim_name in line 1104 (#1) as well as releasing the memory\nin line 1116 (#2).\nWe should kfree() victim_name when the return value of backref_in_log()\nis less than zero and before the function returns in line 1184 (#4).\n1057 static inline int __add_inode_ref(struct btrfs_trans_handle *trans,\n1058   struct btrfs_root *root,\n1059   struct btrfs_path *path,\n1060   struct btrfs_root *log_root,\n1061   struct btrfs_inode *dir,\n1062   struct btrfs_inode *inode,\n1063   u64 inode_objectid, u64 parent_objectid,\n1064   u64 ref_index, char *name, int namelen,\n1065   int *search_done)\n1066 {\n1104 victim_name = kmalloc(victim_name_len, GFP_NOFS);\n// #1: kmalloc (victim_name-1)\n1105 if (!victim_name)\n1106 return -ENOMEM;\n1112ret = backref_in_log(log_root, &search_key,\n1113parent_objectid, victim_name,\n1114victim_name_len);\n1115if (ret < 0) {\n1116kfree(victim_name); // #2: kfree (victim_name-1)\n1117return ret;\n1118} else if (!ret) {\n1169 victim_name = kmalloc(victim_name_len, GFP_NOFS);\n// #3: kmalloc (victim_name-2)\n1170 if (!victim_name)\n1171 return -ENOMEM;\n1180 ret = backref_in_log(log_root, &search_key,\n1181 parent_objectid, victim_name,\n1182 victim_name_len);\n1183 if (ret < 0) {\n1184 return ret; // #4: missing kfree (victim_name-2)\n1185 } else if (!ret) {\n1241 return 0;\n1242 }"], "name": "CVE-2021-47585", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47585\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47585\nhttps://lore.kernel.org/linux-cve-announce/2024061917-CVE-2021-47585-0a6a@gregkh/T"], "threat_severity": "Low"}