CVE-2021-47538

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() Need to call rxrpc_put_local() for peer candidate before kfree() as it holds a ref to rxrpc_local. [DH: v2: Changed to abstract the peer freeing code out into a function]

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/3e70e3a72d80b16094faccbe438cd53761c3503a	Patch
https://git.kernel.org/stable/c/60f0b9c42cb80833a03ca57c1c8b078d716e71d1	Patch
https://git.kernel.org/stable/c/913c24af2d13a3fd304462916ee98e298d56bdce	Patch
https://git.kernel.org/stable/c/9469273e616ca8f1b6e3773c5019f21b4c8d828c	Patch
https://git.kernel.org/stable/c/beacff50edbd6c9659a6f15fc7f6126909fade29	Patch
https://git.kernel.org/stable/c/3e70e3a72d80b16094faccbe438cd53761c3503a	Patch
https://git.kernel.org/stable/c/60f0b9c42cb80833a03ca57c1c8b078d716e71d1	Patch
https://git.kernel.org/stable/c/913c24af2d13a3fd304462916ee98e298d56bdce	Patch
https://git.kernel.org/stable/c/9469273e616ca8f1b6e3773c5019f21b4c8d828c	Patch
https://git.kernel.org/stable/c/beacff50edbd6c9659a6f15fc7f6126909fade29	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:5.4:-::::::
	cpe:2.3:o:linux:linux_kernel:5.4:rc4::::::
	cpe:2.3:o:linux:linux_kernel:5.4:rc5::::::
	cpe:2.3:o:linux:linux_kernel:5.4:rc6::::::
	cpe:2.3:o:linux:linux_kernel:5.4:rc7::::::
	cpe:2.3:o:linux:linux_kernel:5.4:rc8::::::
	cpe:2.3:o:linux:linux_kernel:5.16:rc1::::::
	cpe:2.3:o:linux:linux_kernel:5.16:rc2::::::
	cpe:2.3:o:linux:linux_kernel:5.16:rc3::::::

History

No history.

Information

Published : 2024-05-24 15:15

Updated : 2025-09-18 15:55

NVD link : CVE-2021-47538

Mitre link : CVE-2021-47538

CVE.ORG link : CVE-2021-47538

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

{"id": "CVE-2021-47538", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "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": "2024-05-24T15:15:17.750", "references": [{"url": "https://git.kernel.org/stable/c/3e70e3a72d80b16094faccbe438cd53761c3503a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/60f0b9c42cb80833a03ca57c1c8b078d716e71d1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/913c24af2d13a3fd304462916ee98e298d56bdce", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9469273e616ca8f1b6e3773c5019f21b4c8d828c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/beacff50edbd6c9659a6f15fc7f6126909fade29", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3e70e3a72d80b16094faccbe438cd53761c3503a", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/60f0b9c42cb80833a03ca57c1c8b078d716e71d1", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/913c24af2d13a3fd304462916ee98e298d56bdce", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/9469273e616ca8f1b6e3773c5019f21b4c8d828c", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/beacff50edbd6c9659a6f15fc7f6126909fade29", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-401"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()\n\nNeed to call rxrpc_put_local() for peer candidate before kfree() as it\nholds a ref to rxrpc_local.\n\n[DH: v2: Changed to abstract the peer freeing code out into a function]"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: rxrpc: corrigi\u00f3 la fuga de rxrpc_local en rxrpc_lookup_peer() Es necesario llamar a rxrpc_put_local() para el candidato par antes de kfree(), ya que contiene una referencia a rxrpc_local. [DH: v2: modificado para abstraer el c\u00f3digo de liberaci\u00f3n del par en una funci\u00f3n]"}], "lastModified": "2025-09-18T15:55:34.137", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0B842566-205B-4AAE-9D95-67A8FD4CE9A2", "versionEndExcluding": "4.19.220", "versionStartIncluding": "4.19.82"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FB0DDBC6-6070-4A55-A6BA-776FA7AA9757", "versionEndExcluding": "5.4", "versionStartIncluding": "5.3.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "287BF9FA-2F41-4557-9449-EB290A0B40F8", "versionEndExcluding": "5.4.164", "versionStartIncluding": "5.4.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AE5B4333-2C46-40C3-8B42-0168AD91DDE1", "versionEndExcluding": "5.10.84", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A696A60B-2782-4119-83DD-1EFFBC903F02", "versionEndExcluding": "5.15.7", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4D70AB13-37BE-4BD3-A652-10191F1642E4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "81C1EF68-9FF9-416E-AFED-59088978150A"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F0E28D41-AC78-413B-AA08-FB73CAFFC58C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EEDE6F28-7530-476B-A838-83E5B2D2A2DD"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7BB18ED4-6619-467C-870F-7671261DBEF2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D980DAA0-07F8-4C47-B178-0BDDDA234A06"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A73429BA-C2D9-4D0C-A75F-06A1CA8B3983"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F621B5E3-E99D-49E7-90B9-EC3B77C95383"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}