{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45962", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.089Z", "datePublished": "2026-05-27T12:18:19.070Z", "dateUpdated": "2026-05-27T12:18:19.070Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-27T12:18:19.070Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: Validate SQE128 flag before accessing the cmd\n\nublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before\nIO_URING_F_SQE128 flag check. This could cause out of boundary memory\naccess.\n\nMove the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return\n-EINVAL immediately if the flag is not set."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/ublk_drv.c"], "versions": [{"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "4b4dff498f46e9802f71bc84258bf73065f51c6a", "status": "affected", "versionType": "git"}, {"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "31cac6acf77ece488f29fb8f79589d9298e969c8", "status": "affected", "versionType": "git"}, {"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "dbe8e81a2ec608f87f79a34f6444cd62f6a243bb", "status": "affected", "versionType": "git"}, {"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "f75a5555e0049e7857eae25b60aee98b80e287ec", "status": "affected", "versionType": "git"}, {"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "17d33ba7291100008360b5a354962db37ad80684", "status": "affected", "versionType": "git"}, {"version": "71f28f3136aff5890cd56de78abc673f8393cad9", "lessThan": "da7e4b75e50c087d2031a92f6646eb90f7045a67", "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/block/ublk_drv.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.0", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4b4dff498f46e9802f71bc84258bf73065f51c6a"}, {"url": "https://git.kernel.org/stable/c/31cac6acf77ece488f29fb8f79589d9298e969c8"}, {"url": "https://git.kernel.org/stable/c/dbe8e81a2ec608f87f79a34f6444cd62f6a243bb"}, {"url": "https://git.kernel.org/stable/c/f75a5555e0049e7857eae25b60aee98b80e287ec"}, {"url": "https://git.kernel.org/stable/c/17d33ba7291100008360b5a354962db37ad80684"}, {"url": "https://git.kernel.org/stable/c/da7e4b75e50c087d2031a92f6646eb90f7045a67"}], "title": "ublk: Validate SQE128 flag before accessing the cmd", "x_generator": {"engine": "bippy-1.2.0"}}}}

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This could cause out of boundary memory\naccess.\n\nMove the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return\n-EINVAL immediately if the flag is not set."}], "id": "CVE-2026-45962", "lastModified": "2026-06-17T10:52:48.343", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:17:12.917", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17d33ba7291100008360b5a354962db37ad80684"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31cac6acf77ece488f29fb8f79589d9298e969c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4b4dff498f46e9802f71bc84258bf73065f51c6a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da7e4b75e50c087d2031a92f6646eb90f7045a67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dbe8e81a2ec608f87f79a34f6444cd62f6a243bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f75a5555e0049e7857eae25b60aee98b80e287ec"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ublk: Validate SQE128 flag before accessing the cmd", "id": "2481958", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481958"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's userspace block (ublk) driver. This vulnerability allows a local attacker to cause an out-of-boundary memory access by providing a specially crafted command that bypasses the IO_URING_F_SQE128 flag check. This could lead to a system crash, resulting in a denial of service (DoS), or potentially enable information disclosure."], "name": "CVE-2026-45962", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45962\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45962\nhttps://lore.kernel.org/linux-cve-announce/2026052734-CVE-2026-45962-cd10@gregkh/T"], "threat_severity": "Moderate"}

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