{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53306", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.397Z", "datePublished": "2026-06-26T19:41:01.338Z", "dateUpdated": "2026-06-26T19:41:01.338Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-26T19:41:01.338Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: hvc_iucv: fix off-by-one in number of supported devices\n\nMAX_HVC_IUCV_LINES == HVC_ALLOC_TTY_ADAPTERS == 8.\nThis is the number of entries in:\n static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];\n\nSometimes hvc_iucv_table[] is limited by:\n(a)\tif (num > hvc_iucv_devices) // for error detection\nor\n(b)\tfor (i = 0; i < hvc_iucv_devices; i++) // in 2 places\n(so these 2 don't agree; second one appears to be correct to me.)\n\nhvc_iucv_devices can be 0..8. This is a counter.\n(c)\tif (hvc_iucv_devices > MAX_HVC_IUCV_LINES)\n\nIf hvc_iucv_devices == 8, (a) allows the code to access hvc_iucv_table[8].\nOops."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/hvc/hvc_iucv.c"], "versions": [{"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "484357dff256c816d9466bda35eb765685e4dc86", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "11207e42a332eb8bbcb9fe74df9edd2a807c5607", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "a76511bc654819425d3b15e77b523d7f9d81f064", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "3104a3f40feb107f77d7116ad9bf6c210ab7babf", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "f1dc8e72de9aabe5d96767a4e97219ac26b79fe5", "status": "affected", "versionType": "git"}, {"version": "44a01d5ba8a4d543694461cd3e178cfa6b3f221b", "lessThan": "f2a880e802ad12d1e38039d1334fb1475d0f5241", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/hvc/hvc_iucv.c"], "versions": [{"version": "2.6.29", "status": "affected"}, {"version": "0", "lessThan": "2.6.29", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "2.6.29", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.6.141"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.12.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff"}, {"url": "https://git.kernel.org/stable/c/484357dff256c816d9466bda35eb765685e4dc86"}, {"url": "https://git.kernel.org/stable/c/11207e42a332eb8bbcb9fe74df9edd2a807c5607"}, {"url": "https://git.kernel.org/stable/c/fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4"}, {"url": "https://git.kernel.org/stable/c/a76511bc654819425d3b15e77b523d7f9d81f064"}, {"url": "https://git.kernel.org/stable/c/3104a3f40feb107f77d7116ad9bf6c210ab7babf"}, {"url": "https://git.kernel.org/stable/c/f1dc8e72de9aabe5d96767a4e97219ac26b79fe5"}, {"url": "https://git.kernel.org/stable/c/f2a880e802ad12d1e38039d1334fb1475d0f5241"}], "title": "tty: hvc_iucv: fix off-by-one in number of supported devices", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: tty: hvc_iucv: fix off-by-one in number of supported devices", "id": "2493725", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493725"}, "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-193", "details": ["A flaw was found in the Linux kernel. An off-by-one error in the `hvc_iucv` module can allow a local attacker to cause an out-of-bounds write. This memory corruption could lead to a denial of service (DoS) or potentially other impacts."], "name": "CVE-2026-53306", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53306\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53306\nhttps://lore.kernel.org/linux-cve-announce/2026062619-CVE-2026-53306-02d7@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,484357dff256c816d9466bda35eb765685e4dc86)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,11207e42a332eb8bbcb9fe74df9edd2a807c5607)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,a76511bc654819425d3b15e77b523d7f9d81f064)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,3104a3f40feb107f77d7116ad9bf6c210ab7babf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,f1dc8e72de9aabe5d96767a4e97219ac26b79fe5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[44a01d5ba8a4d543694461cd3e178cfa6b3f221b,f2a880e802ad12d1e38039d1334fb1475d0f5241)"}}], "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": "semver", "value": "2.6.29"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,2.6.29)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-06-26T22:15:06.968172+00:00", "updated": "2026-06-29T16:30:17.109190+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}