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CVE-2021-47585 (GCVE-0-2021-47585)

Vulnerability from cvelistv5 – Published: 2024-06-19 14:53 – Updated: 2026-05-11 13:57
VLAI
Title
btrfs: fix memory leak in __add_inode_ref()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix memory leak in __add_inode_ref() Line 1169 (#3) allocates a memory chunk for victim_name by kmalloc(), but when the function returns in line 1184 (#4) victim_name allocated by line 1169 (#3) is not freed, which will lead to a memory leak. There is a similar snippet of code in this function as allocating a memory chunk for victim_name in line 1104 (#1) as well as releasing the memory in line 1116 (#2). We should kfree() victim_name when the return value of backref_in_log() is less than zero and before the function returns in line 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, 1063 u64 inode_objectid, u64 parent_objectid, 1064 u64 ref_index, char *name, int namelen, 1065 int *search_done) 1066 { 1104 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #1: kmalloc (victim_name-1) 1105 if (!victim_name) 1106 return -ENOMEM; 1112 ret = backref_in_log(log_root, &search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret < 0) { 1116 kfree(victim_name); // #2: kfree (victim_name-1) 1117 return ret; 1118 } else if (!ret) { 1169 victim_name = kmalloc(victim_name_len, GFP_NOFS); // #3: kmalloc (victim_name-2) 1170 if (!victim_name) 1171 return -ENOMEM; 1180 ret = backref_in_log(log_root, &search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 if (ret < 0) { 1184 return ret; // #4: missing kfree (victim_name-2) 1185 } else if (!ret) { 1241 return 0; 1242 }
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-24 18:08 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d3316c8233bb05e0dd855d30aac347bb8ad76ee4 , < 005d9292b5b2e71a009f911bd85d755009b37242 (git)
Affected: d3316c8233bb05e0dd855d30aac347bb8ad76ee4 , < 493ff661d434d6bdf02e3a21adae04d7a0b4265d (git)
Affected: d3316c8233bb05e0dd855d30aac347bb8ad76ee4 , < f35838a6930296fc1988764cfa54cb3f705c0665 (git)
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Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.88 , ≤ 5.10.* (semver)
Unaffected: 5.15.11 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47585\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-19T15:15:53.057\",\"lastModified\":\"2026-06-17T04:17:49.000\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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, \u0026search_key,\\n1113\\t\\t\\tparent_objectid, victim_name,\\n1114\\t\\t\\tvictim_name_len);\\n1115\\tif (ret \u003c 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, \u0026search_key,\\n1181 \\t\\t\\tparent_objectid, victim_name,\\n1182 \\t\\t\\tvictim_name_len);\\n1183 \\tif (ret \u003c 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, \u0026amp;search_key, 1113 parent_objectid, victim_name, 1114 victim_name_len); 1115 if (ret \u0026lt; 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, \u0026amp;search_key, 1181 parent_objectid, victim_name, 1182 victim_name_len); 1183 si (ret \u0026lt; 0) { 1184 retorno ret; // #4: falta kfree (nombre_v\u00edctima-2) 1185 } else if (!ret) { 1241 return 0; 1242 }\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/btrfs/tree-log.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\",\"lessThan\":\"005d9292b5b2e71a009f911bd85d755009b37242\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\",\"lessThan\":\"493ff661d434d6bdf02e3a21adae04d7a0b4265d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\",\"lessThan\":\"f35838a6930296fc1988764cfa54cb3f705c0665\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/btrfs/tree-log.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.88\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.11\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-24T18:08:01.516987Z\",\"id\":\"CVE-2021-47585\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.88\",\"matchCriteriaId\":\"A657B2D0-5B9D-42BE-A3BF-228DBC1B057C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.11\",\"matchCriteriaId\":\"11274E95-438A-449A-B100-01B2B0046669\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:39:58+00:00",
      "cve": "CVE-2021-47585",
      "id": "CVE-2021-47585",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: fix memory leak in __add_inode_ref()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47585.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:36:50Z",
      "cve": "CVE-2021-47585",
      "id": "CVE-2021-47585",
      "initial_release_date": "2024-06-21T03:52:30Z",
      "product_status:known_affected": "330",
      "product_status:known_not_affected": "254",
      "product_status:recommended": "391",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47585",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47585.json",
      "version": "52"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"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\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.778Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47585\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-24T18:08:01.516987Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-24T18:08:06.072Z\"}}], \"cna\": {\"title\": \"btrfs: fix memory leak in __add_inode_ref()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\", \"lessThan\": \"005d9292b5b2e71a009f911bd85d755009b37242\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\", \"lessThan\": \"493ff661d434d6bdf02e3a21adae04d7a0b4265d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d3316c8233bb05e0dd855d30aac347bb8ad76ee4\", \"lessThan\": \"f35838a6930296fc1988764cfa54cb3f705c0665\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/tree-log.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/tree-log.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"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, \u0026search_key,\\n1113\\t\\t\\tparent_objectid, victim_name,\\n1114\\t\\t\\tvictim_name_len);\\n1115\\tif (ret \u003c 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, \u0026search_key,\\n1181 \\t\\t\\tparent_objectid, victim_name,\\n1182 \\t\\t\\tvictim_name_len);\\n1183 \\tif (ret \u003c 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\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.