CVE-2026-64267

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{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/fuse/dev.c", "fs/fuse/notify.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6e2d84fdeac05bfd858e84a76353fdb84f23a43e", "status": "affected", "version": "3f29d59e92a96d843c2ff10ebfed92ac26878658", "versionType": "git"}, {"lessThan": "c78c4b242299bc581e4987e5c2786c6f4760c516", "status": "affected", "version": "3f29d59e92a96d843c2ff10ebfed92ac26878658", "versionType": "git"}, {"lessThan": "54243797cedf55447b4c5d560e8cd709900061ae", "status": "affected", "version": "3f29d59e92a96d843c2ff10ebfed92ac26878658", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/fuse/dev.c", "fs/fuse/notify.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.39", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CA2CE3BD-0548-4984-8C39-F3D3DF4D64E1", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: avoid 32-bit prune notification count wrap\n\nFUSE_NOTIFY_PRUNE validates the nodeid payload length with:\n\n size - sizeof(outarg) != outarg.count * sizeof(u64)\n\nOn 32-bit kernels, size_t is also 32 bits, so the daemon-controlled\ncount multiplication can wrap. A prune notification with count\n0x20000000 and no nodeid payload passes the check, enters the copy\nloop, and asks the device copy path to read nodeids that are not\npresent in the userspace write buffer. In QEMU this reaches the\nfuse_copy_fill() BUG_ON(!err) path.\n\nValidate the payload length with array_size() instead. That accepts\nexactly the same valid messages, but avoids wrapping arithmetic before\nthe copy loop consumes the count."}], "id": "CVE-2026-64267", "lastModified": "2026-08-17T05:17:25.547", "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": "2026-07-25T10:17:06.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/54243797cedf55447b4c5d560e8cd709900061ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e2d84fdeac05bfd858e84a76353fdb84f23a43e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c78c4b242299bc581e4987e5c2786c6f4760c516"}], "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: fuse: avoid 32-bit prune notification count wrap", "id": "2507079", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507079"}, "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-190", "details": ["A flaw was found in the Linux kernel's Filesystem in Userspace (FUSE) component. On 32-bit systems, an integer overflow vulnerability exists in the handling of `FUSE_NOTIFY_PRUNE` messages. A malicious FUSE daemon or a local user could craft a prune notification with a specific count, causing an integer overflow during payload length validation. This can lead to the kernel attempting to read non-existent data, resulting in a system crash and a Denial of Service (DoS)."], "name": "CVE-2026-64267", "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": "Out of support scope", "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64267\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64267\nhttps://lore.kernel.org/linux-cve-announce/2026072559-CVE-2026-64267-a265@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f29d59e92a96d843c2ff10ebfed92ac26878658,6e2d84fdeac05bfd858e84a76353fdb84f23a43e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f29d59e92a96d843c2ff10ebfed92ac26878658,c78c4b242299bc581e4987e5c2786c6f4760c516)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f29d59e92a96d843c2ff10ebfed92ac26878658,54243797cedf55447b4c5d560e8cd709900061ae)"}}], "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": "[6.18,6.18]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "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": "2026-07-25T11:45:17.633767+00:00", "updated": "2026-08-13T10:30:04.818444+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}