CVE-2026-46124

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That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation. For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata. The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable code is reached when nfsd decodes an attacker-supplied NFS file handle (exportfs_decode_fh \u2192 isofs_fh_to_dentry), so a remote NFS client triggers it over the network (TCP/UDP 2049).\nAC:L - The attacker fully controls the block field in the file handle and the read is deterministic; no race or uncontrollable memory layout is involved.\nPR:N - The decode runs before per-user permission checks, and the realistic deployment (a read-only ISO exported to a subnet via default AUTH_SYS) lets any permitted network peer craft handles without credentials.\nUI:N - The NFS server processes the crafted request automatically; no victim action is required at attack time beyond the pre-existing export.\nS:U - The impact stays within the kernel filesystem/NFS security authority; no cross-authority boundary (VM, IOMMU, sandbox) is crossed.\nC:H - An out-of-bounds (cross-partition) read of arbitrary in-range blocks on the backing device is disclosed to the NFS client as inode metadata, and is not bounded to a few bytes since the attacker can probe blocks across the device.\nI:N - isofs is mounted strictly read-only and the commit confirms no memory-safety violation, so the attacker cannot modify any data or kernel memory.\nA:N - Out-of-range reads return NULL cleanly via the EIO path and in-range parsing is bounded; the commit and maintainer explicitly confirm no crash, 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processes the crafted request automatically; no victim action is required at attack time beyond the pre-existing export.\nS:U - The impact stays within the kernel filesystem/NFS security authority; no cross-authority boundary (VM, IOMMU, sandbox) is crossed.\nC:H - An out-of-bounds (cross-partition) read of arbitrary in-range blocks on the backing device is disclosed to the NFS client as inode metadata, and is not bounded to a few bytes since the attacker can probe blocks across the device.\nI:N - isofs is mounted strictly read-only and the commit confirms no memory-safety violation, so the attacker cannot modify any data or kernel memory.\nA:N - Out-of-range reads return NULL cleanly via the EIO path and in-range parsing is bounded; the commit and maintainer explicitly confirm no crash, hang, or memory-safety fault."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", 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That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation. For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata. The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "5.10.237"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "5.15.181"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "6.1.135"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.140", "versionStartIncluding": "6.6.88"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.88", "versionStartIncluding": "6.12.25"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.30", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.293"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "6.14.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:53.831Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46124", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:36:51.382Z", "dateReserved": "2026-05-13T15:03:33.098Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-28T09:35:38.887Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation. For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata. The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line."}], "id": "CVE-2026-46124", "lastModified": "2026-10-19T20:18:33.240", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46124", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:20:06.239084Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:27.920", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: isofs: validate block number from NFS file handle in isofs_export_iget", "id": "2482646", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482646"}, "csaw": false, "cwe": "CWE-1285", "details": ["A flaw was found in the Linux kernel's `isofs` filesystem. An authenticated NFS (Network File System) peer can exploit this vulnerability by providing a specially crafted file handle. This allows the server to read arbitrary in-range blocks on the backing device, leading to information disclosure where unrelated data from adjacent partitions may be sent to the NFS client as directory entry metadata."], "name": "CVE-2026-46124", "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": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46124\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46124\nhttps://lore.kernel.org/linux-cve-announce/2026052816-CVE-2026-46124-759e@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[952e7a7e317f126d0a2b879fc531b716932d5ffa,bb0988ed4f2e26d59bbb58f644cb3a55b7521e21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[56dfffea9fd3be0b3795a9ca6401e133a8427e0b,0a1af74ae2177bda3aee0837a0546309aa539d0d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0405d4b63d082861f4eaff9d39c78ee9dc34f845,afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0405d4b63d082861f4eaff9d39c78ee9dc34f845,4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0405d4b63d082861f4eaff9d39c78ee9dc34f845,24376458138387fb251e782e624c7776e9826796)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ee01a309ebf598be1ff8174901ed6e91619f1749"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "5e7de55602c61c8ff28db075cc49c8dd6989d7e0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "63d5a3e207bf315a32c7d16de6c89753a759f95a"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "0fdafdaef796816a9ed0fd7ac812932d569d9beb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "007124c896e7d4614ac1f6bd4dedb975c35a2a8e"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.88,6.6.140)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.25,6.12.88)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.293,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.237,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.181,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.135,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.14.4,6.15)"}}], "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": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc2,*]"}}], "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": "2026-05-28T11:30:15.485456+00:00", "updated": "2026-10-19T22:45:04.820278+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125", "CWE-1285"]}