{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-31402-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-25T12:54:00Z", "generator": { "date": "2026-08-25T12:54:00Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-31402-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-04-03T15:16:05Z", "revision_history": [ { "date": "2026-04-03T15:16:05Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:54:00Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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"category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-31402", "cwe": { "id": "CWE-787", "name": "Out-of-bounds Write" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix heap overflow in NFSv4.0 LOCK replay cache\n\nThe NFSv4.0 replay cache uses a fixed 112-byte inline buffer\n(rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses.\nThis size was calculated based on OPEN responses and does not account\nfor LOCK denied responses, which include the conflicting lock owner as\na variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT).\n\nWhen a LOCK operation is denied due to a conflict with an existing lock\nthat has a large owner, nfsd4_encode_operation() copies the full encoded\nresponse into the undersized replay buffer via read_bytes_from_xdr_buf()\nwith no bounds check. This results in a slab-out-of-bounds write of up\nto 944 bytes past the end of the buffer, corrupting adjacent heap memory.\n\nThis can be triggered remotely by an unauthenticated attacker with two\ncooperating NFSv4.0 clients: one sets a lock with a large owner string,\nthen the other requests a conflicting lock to provoke the denial.\n\nWe could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full\nopaque, but that would increase the size of every stateowner, when most\nlockowners are not that large.\n\nInstead, fix this by checking the encoded response length against\nNFSD4_REPLAY_ISIZE before copying into the replay buffer. If the\nresponse is too large, set rp_buflen to 0 to skip caching the replay\npayload. The status is still cached, and the client already received the\ncorrect response on the original request.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "under_investigation": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-31402" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0f0e2a54a31a7f9ad2915db99156114872317388", "url": "https://git.kernel.org/stable/c/0f0e2a54a31a7f9ad2915db99156114872317388" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/2665887a69437a8a4f552f69509eecfb73d4aa19", "url": "https://git.kernel.org/stable/c/2665887a69437a8a4f552f69509eecfb73d4aa19" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5133b61aaf437e5f25b1b396b14242a6bb0508e2", "url": "https://git.kernel.org/stable/c/5133b61aaf437e5f25b1b396b14242a6bb0508e2" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/8afb437ea1f70cacb4bbdf11771fb5c4d720b965", "url": "https://git.kernel.org/stable/c/8afb437ea1f70cacb4bbdf11771fb5c4d720b965" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/ae8498337dfdfda71bdd0b807c9a23a126011d76", "url": "https://git.kernel.org/stable/c/ae8498337dfdfda71bdd0b807c9a23a126011d76" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c9452c0797c95cf2378170df96cf4f4b3bca7eff", "url": "https://git.kernel.org/stable/c/c9452c0797c95cf2378170df96cf4f4b3bca7eff" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/dad0c3c0a8e5d1d6eb0fc455694ce3e25e6c57d0", "url": "https://git.kernel.org/stable/c/dad0c3c0a8e5d1d6eb0fc455694ce3e25e6c57d0" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f9fcb4441f6c02bb20c2eb340101e27dfe23607c", "url": "https://git.kernel.org/stable/c/f9fcb4441f6c02bb20c2eb340101e27dfe23607c" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:10108", "url": "https://access.redhat.com/errata/RHSA-2026:10108" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:11313", "url": "https://access.redhat.com/errata/RHSA-2026:11313" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13565", "url": "https://access.redhat.com/errata/RHSA-2026:13565" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13566", "url": "https://access.redhat.com/errata/RHSA-2026:13566" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13577", "url": "https://access.redhat.com/errata/RHSA-2026:13577" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13578", "url": "https://access.redhat.com/errata/RHSA-2026:13578" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13664", "url": "https://access.redhat.com/errata/RHSA-2026:13664" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13681", "url": "https://access.redhat.com/errata/RHSA-2026:13681" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13734", "url": "https://access.redhat.com/errata/RHSA-2026:13734" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:13936", "url": "https://access.redhat.com/errata/RHSA-2026:13936" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14137", "url": "https://access.redhat.com/errata/RHSA-2026:14137" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14165", "url": "https://access.redhat.com/errata/RHSA-2026:14165" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14301", "url": "https://access.redhat.com/errata/RHSA-2026:14301" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14823", "url": "https://access.redhat.com/errata/RHSA-2026:14823" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14869", "url": "https://access.redhat.com/errata/RHSA-2026:14869" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:14925", "url": "https://access.redhat.com/errata/RHSA-2026:14925" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:15883", "url": "https://access.redhat.com/errata/RHSA-2026:15883" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19568", "url": "https://access.redhat.com/errata/RHSA-2026:19568" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:19569", "url": "https://access.redhat.com/errata/RHSA-2026:19569" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:36530", "url": "https://access.redhat.com/errata/RHSA-2026:36530" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:36531", "url": "https://access.redhat.com/errata/RHSA-2026:36531" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:36532", "url": "https://access.redhat.com/errata/RHSA-2026:36532" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:36533", "url": "https://access.redhat.com/errata/RHSA-2026:36533" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:36534", "url": "https://access.redhat.com/errata/RHSA-2026:36534" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2026-31402", "url": "https://access.redhat.com/security/cve/CVE-2026-31402" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2454844", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454844" }, { "category": "external", "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html" }, { "category": "external", "summary": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "category": "external", "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31402.json", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31402.json" } ], "release_date": "2026-04-03T15:16:05Z", "remediations": [ { "category": "none_available", "date": "2026-08-06T12:21:41.587012Z", "details": "Affected", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }