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The mask is\nderived from O_ACCMODE alone, so an open(O_RDONLY | O_TRUNC) against a\nfile the caller cannot write requests only MAY_READ and passes the\nlocal check. The OPEN is then satisfied locally and the truncation is\nissued to the server as a SETATTR(size=0) over the delegation stateid,\nwhich the server accepts under standard write-delegation semantics.\nPOSIX requires that this open fail with EACCES.\n\nInclude MAY_WRITE in the mask whenever O_TRUNC is set so the local\ncheck matches the access the server would have enforced."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - An unprivileged local process triggers the flaw through open/openat with O_RDONLY|O_TRUNC on an accessible NFSv4-mounted file. The resulting NFS RPC is outbound and does not make the attack remotely reachable.\nAC:L - Once the client holds a standard cached write delegation, a single deterministic open triggers the unauthorized truncation without a race or timing requirement. Delegations persist and the attacker can repeatedly target files actively written through the same client.\nPR:L - The attacker needs only ordinary local access and read/search permission for the target path; no capability or administrative privilege is required. User namespaces are unnecessary.\nUI:N - The attacker invokes open directly and no contemporaneous action by another user is required.\nS:U - The faulty client-side permission check and modification of the delegated NFS file remain within the NFS filesystem access-control authority.\nC:N - The flaw discloses no kernel or file data beyond content the caller was already authorized to read, and it involves no memory corruption.\nI:H - The attacker can irreversibly truncate the complete contents of a file for which write access was denied, causing total integrity loss of that resource.\nA:H - Truncating critical NFS-hosted executables, configuration, databases, or operational data can completely disable dependent systems or services, and the attack can be repeated against additional delegated files."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": 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to\nnfs_may_open(), which is the local authorization gate for OPENs the\nclient serves itself from a cached write delegation via the\ncan_open_delegated() path in nfs4_try_open_cached(). The mask is\nderived from O_ACCMODE alone, so an open(O_RDONLY | O_TRUNC) against a\nfile the caller cannot write requests only MAY_READ and passes the\nlocal check. The OPEN is then satisfied locally and the truncation is\nissued to the server as a SETATTR(size=0) over the delegation stateid,\nwhich the server accepts under standard write-delegation semantics.\nPOSIX requires that this open fail with EACCES.\n\nInclude MAY_WRITE in the mask whenever O_TRUNC is set so the local\ncheck matches the access the server would have enforced."}], "id": "CVE-2026-64298", "lastModified": "2026-08-12T14:54:13.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:10.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22c1fd1355ad4ca27aa7f0fa02719122dd92d9de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/30fdf4df6c3c00efec947e4ddf97f0fdd4473628"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4817c8974315b666e895b7d1bb83cd3664c323b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5140f099ecd8a2f2808b7f7b720ee1bad8468974"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bd7d0a06b53c4e797e1a9cea0d2d41aa1b26230"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a937e92c1d00534b5c2e3e9f4381b7e988180797"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cb148a2762d644bff1894728e8835a9a4b84f9ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e36501b7d4abdcd6d69a7cb901b2f286b7a3d041"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC", "id": "2507208", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507208"}, "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-358", "details": ["A flaw was found in the Linux kernel's NFSv4 implementation. A local user could exploit a vulnerability where opening a file with O_TRUNC (truncate) and O_RDONLY (read-only) flags would bypass the necessary write permission checks. This oversight allows an attacker to truncate a file without having explicit write access, leading to unauthorized data modification."], "name": "CVE-2026-64298", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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-2026-64298\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64298\nhttps://lore.kernel.org/linux-cve-announce/2026072506-CVE-2026-64298-f748@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,4817c8974315b666e895b7d1bb83cd3664c323b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,cb148a2762d644bff1894728e8835a9a4b84f9ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,30fdf4df6c3c00efec947e4ddf97f0fdd4473628)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,22c1fd1355ad4ca27aa7f0fa02719122dd92d9de)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,6bd7d0a06b53c4e797e1a9cea0d2d41aa1b26230)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,a937e92c1d00534b5c2e3e9f4381b7e988180797)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,e36501b7d4abdcd6d69a7cb901b2f286b7a3d041)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[af22f94ae02ab9dd4fd7fe628c8434a59cc293be,5140f099ecd8a2f2808b7f7b720ee1bad8468974)"}}], "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": "2.6.24"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.24)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"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-rc3,*]"}}], "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": "2026-07-25T21:45:16.674771+00:00", "updated": "2026-08-13T12:15:17.525222+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}