CVE-2026-64558

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.

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/02028a24e26d85262ab9c8fc4344e1f3503007fc	Patch
https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4	Patch
https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da	Patch
https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989	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::::::::

History

13 Nov 2026, 18:20

Type	Values Removed	Values Added
CPE		cpe:2.3:o:linux:linux_kernel::::::::
References	~~() https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc -~~	() https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc - Patch
References	~~() https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4 -~~	() https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4 - Patch
References	~~() https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da -~~	() https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da - Patch
References	~~() https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989 -~~	() https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989 - Patch
First Time		Linux linux Kernel Linux

19 Oct 2026, 21:17

Type	Values Removed	Values Added
CWE		CWE-122

Information

Published : 2026-07-29 17:16

Updated : 2026-11-13 18:20

NVD link : CVE-2026-64558

Mitre link : CVE-2026-64558

CVE.ORG link : CVE-2026-64558

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-122

Heap-based Buffer Overflow

{"id": "CVE-2026-64558", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64558", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:42:40.566840Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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": "8fcc231ce3bea12b78bb94b280cdc03cff342435", "lessThan": "02028a24e26d85262ab9c8fc4344e1f3503007fc", "versionType": "git"}, {"status": "affected", "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435", "lessThan": "433e5e70cdc1edf382d28d08a885b22e2b98b7da", "versionType": "git"}, {"status": "affected", "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435", "lessThan": "614aa0491c7a190556c2345dddee0b6f5ed90989", "versionType": "git"}, {"status": "affected", "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435", "lessThan": "1ac287e2af9a9112fe271427ef45eceb26bce8b4", "versionType": "git"}], "programFiles": ["drivers/s390/crypto/pkey_pckmo.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"status": "unaffected", "version": "0", "lessThan": "6.12", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/s390/crypto/pkey_pckmo.c"], "defaultStatus": "affected"}]}], "published": "2026-07-29T17:16:53.410", "references": [{"url": "https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in pkey_pckmo handler implementation\n\nExplicitly check the length of the target buffer in the pkey_pckmo\nimplementation of the key_to_protkey() handler function. The handler\nfunction fails, if the generated output data exceeds the length of the\nprovided target buffer."}], "lastModified": "2026-11-13T18:20:53.067", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D2FA72D-20C9-432C-AC3C-498C90F2B579", "versionEndExcluding": "6.12.97", "versionStartIncluding": "6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "67D87928-1419-4529-9201-42C059678CB4", "versionEndExcluding": "6.18.40", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FE149C35-43CC-473B-86E3-978E6A9CBC55", "versionEndExcluding": "7.1.5", "versionStartIncluding": "6.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}