CVE-2026-80543

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80543", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.765Z", "datePublished": "2026-08-26T14:37:15.765Z", "dateUpdated": "2026-10-21T12:46:26.051Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:46:26.051Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Pad trailing CCA or EP11 message with zeros\n\nThe both functions xcrb_msg_to_type6cprb_msgx() and\nxcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a\nkernel buffer based on the message length. But on further processing\nthe message is supposed to be 4 byte length adjusted. Thus up to 3\nbytes of uninitialized kernel memory are forwarded to further\nprocessing steps and may unwanted expose kernel memory to the crypto\ncard firmware.\n\nThis patch contains code to pad the gap between user space copied\nmessage and message buffer length sent down to further processing of\nthe CCA or EP11 message to zeros."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/s390/crypto/zcrypt_msgtype6.c"], "versions": [{"version": "20b0b0159390fa5c00a435195649680fefda81e0", "lessThan": "44e61f1834831f873af5a4fec5a5e432b929c6a2", "status": "affected", "versionType": "git"}, {"version": "e2c6d91eb8b1533753755f07803e47eceed263d0", "lessThan": "2db92a56b000173d332b6c30f38a5a4444e4355a", "status": "affected", "versionType": "git"}, {"version": "e2c6d91eb8b1533753755f07803e47eceed263d0", "lessThan": "eb363254472493e3458156fc11fd56dca92f4333", "status": "affected", "versionType": "git"}, {"version": "f9da85d4780515f65983e0af151458599adaef3d", "status": "affected", "versionType": "git"}, {"version": "6.12.114", "lessThan": "6.13", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/s390/crypto/zcrypt_msgtype6.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "7.1", "versionEndExcluding": "7.1.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.114"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/44e61f1834831f873af5a4fec5a5e432b929c6a2"}, {"url": "https://git.kernel.org/stable/c/2db92a56b000173d332b6c30f38a5a4444e4355a"}, {"url": "https://git.kernel.org/stable/c/eb363254472493e3458156fc11fd56dca92f4333"}], "title": "s390/zcrypt: Pad trailing CCA or EP11 message with zeros", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/s390/crypto/zcrypt_msgtype6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "44e61f1834831f873af5a4fec5a5e432b929c6a2", "status": "affected", "version": "20b0b0159390fa5c00a435195649680fefda81e0", "versionType": "git"}, {"lessThan": "2db92a56b000173d332b6c30f38a5a4444e4355a", "status": "affected", "version": "e2c6d91eb8b1533753755f07803e47eceed263d0", "versionType": "git"}, {"lessThan": "eb363254472493e3458156fc11fd56dca92f4333", "status": "affected", "version": "e2c6d91eb8b1533753755f07803e47eceed263d0", "versionType": "git"}, {"status": "affected", "version": "f9da85d4780515f65983e0af151458599adaef3d", "versionType": "git"}, {"lessThan": "6.13", "status": "affected", "version": "6.12.114", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/s390/crypto/zcrypt_msgtype6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Pad trailing CCA or EP11 message with zeros\n\nThe both functions xcrb_msg_to_type6cprb_msgx() and\nxcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a\nkernel buffer based on the message length. But on further processing\nthe message is supposed to be 4 byte length adjusted. Thus up to 3\nbytes of uninitialized kernel memory are forwarded to further\nprocessing steps and may unwanted expose kernel memory to the crypto\ncard firmware.\n\nThis patch contains code to pad the gap between user space copied\nmessage and message buffer length sent down to further processing of\nthe CCA or EP11 message to zeros."}], "id": "CVE-2026-80543", "lastModified": "2026-10-21T13:19:54.057", "metrics": {}, "published": "2026-08-26T15:17:08.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2db92a56b000173d332b6c30f38a5a4444e4355a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/44e61f1834831f873af5a4fec5a5e432b929c6a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb363254472493e3458156fc11fd56dca92f4333"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: s390/zcrypt: Pad trailing CCA or EP11 message with zeros", "id": "2524454", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524454"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ns390/zcrypt: Pad trailing CCA or EP11 message with zeros\nThe both functions xcrb_msg_to_type6cprb_msgx() and\nxcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a\nkernel buffer based on the message length. But on further processing\nthe message is supposed to be 4 byte length adjusted. Thus up to 3\nbytes of uninitialized kernel memory are forwarded to further\nprocessing steps and may unwanted expose kernel memory to the crypto\ncard firmware.\nThis patch contains code to pad the gap between user space copied\nmessage and message buffer length sent down to further processing of\nthe CCA or EP11 message to zeros.", "A flaw was found in the Linux kernel's s390/zcrypt component. When copying user-space messages into a kernel buffer, the system fails to properly pad the message to a 4-byte length. This oversight can lead to up to three bytes of uninitialized kernel memory being exposed to the crypto card firmware, potentially resulting in information disclosure."], "name": "CVE-2026-80543", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2026-08-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80543\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80543\nhttps://lore.kernel.org/linux-cve-announce/2026082606-CVE-2026-80543-592a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2c6d91eb8b1533753755f07803e47eceed263d0,2db92a56b000173d332b6c30f38a5a4444e4355a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e2c6d91eb8b1533753755f07803e47eceed263d0,eb363254472493e3458156fc11fd56dca92f4333)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.10,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-26T15:45:04.429858+00:00", "updated": "2026-08-28T18:00:15.560053+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}