CVE-2026-53067

In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc pci_epf_alloc_doorbell() stores the allocated doorbell message array in epf->db_msg/epf->num_db before requesting MSI vectors. If MSI allocation fails, the array is freed but the EPF state may still point to freed memory. Clear epf->db_msg and epf->num_db on the MSI allocation failure path so that later cleanup cannot double-free the array and callers can retry allocation. Also return -EBUSY when doorbells have already been allocated to prevent leaking or overwriting an existing allocation.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/175717cfc06cab79f84cd037d66dda1b8564cd9e	Patch
https://git.kernel.org/stable/c/1cba96c0a795124c3229293ed7b5b5765e66f259	Patch
https://git.kernel.org/stable/c/3c25587fbf8797b92090b064a6d239a873e55fb1	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

21 Jul 2026, 17:37

Type	Values Removed	Values Added
First Time		Linux linux Kernel Linux
References	~~() https://git.kernel.org/stable/c/175717cfc06cab79f84cd037d66dda1b8564cd9e -~~	() https://git.kernel.org/stable/c/175717cfc06cab79f84cd037d66dda1b8564cd9e - Patch
References	~~() https://git.kernel.org/stable/c/1cba96c0a795124c3229293ed7b5b5765e66f259 -~~	() https://git.kernel.org/stable/c/1cba96c0a795124c3229293ed7b5b5765e66f259 - Patch
References	~~() https://git.kernel.org/stable/c/3c25587fbf8797b92090b064a6d239a873e55fb1 -~~	() https://git.kernel.org/stable/c/3c25587fbf8797b92090b064a6d239a873e55fb1 - Patch
CWE		CWE-415
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8
CPE		cpe:2.3:o:linux:linux_kernel::::::::

24 Jun 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-24 17:17

Updated : 2026-07-21 17:37

NVD link : CVE-2026-53067

Mitre link : CVE-2026-53067

CVE.ORG link : CVE-2026-53067

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-415

Double Free

{"id": "CVE-2026-53067", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1c3b002c6bf684b445a7107609979bca5f21bc03", "lessThan": "175717cfc06cab79f84cd037d66dda1b8564cd9e", "versionType": "git"}, {"status": "affected", "version": "1c3b002c6bf684b445a7107609979bca5f21bc03", "lessThan": "3c25587fbf8797b92090b064a6d239a873e55fb1", "versionType": "git"}, {"status": "affected", "version": "1c3b002c6bf684b445a7107609979bca5f21bc03", "lessThan": "1cba96c0a795124c3229293ed7b5b5765e66f259", "versionType": "git"}], "programFiles": ["drivers/pci/endpoint/pci-ep-msi.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"status": "unaffected", "version": "0", "lessThan": "6.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.33", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/pci/endpoint/pci-ep-msi.c"], "defaultStatus": "affected"}]}], "published": "2026-06-24T17:17:19.780", "references": [{"url": "https://git.kernel.org/stable/c/175717cfc06cab79f84cd037d66dda1b8564cd9e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1cba96c0a795124c3229293ed7b5b5765e66f259", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3c25587fbf8797b92090b064a6d239a873e55fb1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-415"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc\n\npci_epf_alloc_doorbell() stores the allocated doorbell message array in\nepf->db_msg/epf->num_db before requesting MSI vectors. If MSI allocation\nfails, the array is freed but the EPF state may still point to freed\nmemory.\n\nClear epf->db_msg and epf->num_db on the MSI allocation failure path so\nthat later cleanup cannot double-free the array and callers can retry\nallocation.\n\nAlso return -EBUSY when doorbells have already been allocated to prevent\nleaking or overwriting an existing allocation."}], "lastModified": "2026-07-21T17:37:33.227", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4F0E1027-1081-4E2B-9D56-AF79BAFF146B", "versionEndExcluding": "6.18.33", "versionStartIncluding": "6.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4", "versionEndExcluding": "7.0.10", "versionStartIncluding": "6.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}