{ "document": { "aggregate_severity": { "text": "Important" }, "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/ubuntu18.04els/vex/2025/cve-2025-39735-els_os-ubuntu18_04els.json" } ], "title": "Security update on CVE-2025-39735", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2025-39735-ELS_OS-UBUNTU18.04ELS", "initial_release_date": "2025-04-18T07:15:00Z", "revision_history": [ { "date": "2025-04-18T07:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-07-21T07:41:56Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 18.04", "product": { "name": "Ubuntu 18.04", "product_id": "Ubuntu-18", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product": { "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_id": "linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-image-unsigned-4.15.0-249-tuxcare.els37-generic@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product": { "name": "linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_id": "linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-modules-extra-4.15.0-249-tuxcare.els37-generic@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product": { "name": "linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_id": "linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-modules-4.15.0-249-tuxcare.els37-lowlatency@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product": { "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_id": "linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product": { "name": "linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_id": "linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-headers-4.15.0-249-tuxcare.els37-generic@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product": { "name": "linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_id": "linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-tools-4.15.0-249-tuxcare.els37-lowlatency@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product": { "name": "linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_id": "linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-buildinfo-4.15.0-249-tuxcare.els37-generic@4.15.0-249.260?arch=amd64" } } }, { "category": "product_version", "name": "linux-libc-dev-0:4.15.0-249.260.amd64", "product": { "name": "linux-libc-dev-0:4.15.0-249.260.amd64", "product_id": "linux-libc-dev-0:4.15.0-249.260.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-libc-dev@4.15.0-249.260?arch=amd64" } } } ], "category": "architecture", "name": "amd64" }, { "branches": [ { "category": "product_version", "name": "linux-tools-host-0:4.15.0-249.260.all", "product": { "name": "linux-tools-host-0:4.15.0-249.260.all", "product_id": "linux-tools-host-0:4.15.0-249.260.all", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-tools-host@4.15.0-249.260?arch=all" } } }, { "category": "product_version", "name": "linux-doc-0:4.15.0-249.260.all", "product": { "name": "linux-doc-0:4.15.0-249.260.all", "product_id": "linux-doc-0:4.15.0-249.260.all", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/linux-doc@4.15.0-249.260?arch=all" } } } ], "category": "architecture", "name": "all" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64" }, "product_reference": "linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64" }, "product_reference": "linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64" }, "product_reference": "linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64" }, "product_reference": "linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64" }, "product_reference": "linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-tools-host-0:4.15.0-249.260.all as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-tools-host-0:4.15.0-249.260.all" }, "product_reference": "linux-tools-host-0:4.15.0-249.260.all", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-doc-0:4.15.0-249.260.all as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-doc-0:4.15.0-249.260.all" }, "product_reference": "linux-doc-0:4.15.0-249.260.all", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64" }, "product_reference": "linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64" }, "product_reference": "linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" }, { "category": "default_component_of", "full_product_name": { "name": "linux-libc-dev-0:4.15.0-249.260.amd64 as a component of Ubuntu 18.04", "product_id": "Ubuntu-18:linux-libc-dev-0:4.15.0-249.260.amd64" }, "product_reference": "linux-libc-dev-0:4.15.0-249.260.amd64", "relates_to_product_reference": "Ubuntu-18" } ] }, "vulnerabilities": [ { "cve": "CVE-2025-39735", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix slab-out-of-bounds read in ea_get()\n\nDuring the \"size_check\" label in ea_get(), the code checks if the extended\nattribute list (xattr) size matches ea_size. If not, it logs\n\"ea_get: invalid extended attribute\" and calls print_hex_dump().\n\nHere, EALIST_SIZE(ea_buf->xattr) returns 4110417968, which exceeds\nINT_MAX (2,147,483,647). Then ea_size is clamped:\n\n\tint size = clamp_t(int, ea_size, 0, EALIST_SIZE(ea_buf->xattr));\n\nAlthough clamp_t aims to bound ea_size between 0 and 4110417968, the upper\nlimit is treated as an int, causing an overflow above 2^31 - 1. This leads\n\"size\" to wrap around and become negative (-184549328).\n\nThe \"size\" is then passed to print_hex_dump() (called \"len\" in\nprint_hex_dump()), it is passed as type size_t (an unsigned\ntype), this is then stored inside a variable called\n\"int remaining\", which is then assigned to \"int linelen\" which\nis then passed to hex_dump_to_buffer(). In print_hex_dump()\nthe for loop, iterates through 0 to len-1, where len is\n18446744073525002176, calling hex_dump_to_buffer()\non each iteration:\n\n\tfor (i = 0; i < len; i += rowsize) {\n\t\tlinelen = min(remaining, rowsize);\n\t\tremaining -= rowsize;\n\n\t\thex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,\n\t\t\t\t linebuf, sizeof(linebuf), ascii);\n\n\t\t...\n\t}\n\nThe expected stopping condition (i < len) is effectively broken\nsince len is corrupted and very large. This eventually leads to\nthe \"ptr+i\" being passed to hex_dump_to_buffer() to get closer\nto the end of the actual bounds of \"ptr\", eventually an out of\nbounds access is done in hex_dump_to_buffer() in the following\nfor loop:\n\n\tfor (j = 0; j < len; j++) {\n\t\t\tif (linebuflen < lx + 2)\n\t\t\t\tgoto overflow2;\n\t\t\tch = ptr[j];\n\t\t...\n\t}\n\nTo fix this we should validate \"EALIST_SIZE(ea_buf->xattr)\"\nbefore it is utilised.", "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": { "fixed": [ "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-tools-host-0:4.15.0-249.260.all", "Ubuntu-18:linux-doc-0:4.15.0-249.260.all", "Ubuntu-18:linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-libc-dev-0:4.15.0-249.260.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2025-39735" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652", "url": "https://git.kernel.org/stable/c/0beddc2a3f9b9cf7d8887973041e36c2d0fa3652" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d", "url": "https://git.kernel.org/stable/c/16d3d36436492aa248b2d8045e75585ebcc2f34d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3d6fd5b9c6acbc005e53d0211c7381f566babec1", "url": "https://git.kernel.org/stable/c/3d6fd5b9c6acbc005e53d0211c7381f566babec1" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/46e2c031aa59ea65128991cbca474bd5c0c2ecdb", "url": "https://git.kernel.org/stable/c/46e2c031aa59ea65128991cbca474bd5c0c2ecdb" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/50afcee7011155933d8d5e8832f52eeee018cfd3", "url": "https://git.kernel.org/stable/c/50afcee7011155933d8d5e8832f52eeee018cfd3" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5263822558a8a7c0d0248d5679c2dcf4d5cda61f", "url": "https://git.kernel.org/stable/c/5263822558a8a7c0d0248d5679c2dcf4d5cda61f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/78c9cbde8880ec02d864c166bcb4fe989ce1d95f", "url": "https://git.kernel.org/stable/c/78c9cbde8880ec02d864c166bcb4fe989ce1d95f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab", "url": "https://git.kernel.org/stable/c/a8c31808925b11393a6601f534bb63bac5366bab" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37", "url": "https://git.kernel.org/stable/c/fdf480da5837c23b146c4743c18de97202fcab37" } ], "release_date": "2025-04-18T07:15:00", "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1" }, "products": [ "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-modules-extra-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-modules-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-image-unsigned-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-headers-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-tools-host-0:4.15.0-249.260.all", "Ubuntu-18:linux-doc-0:4.15.0-249.260.all", "Ubuntu-18:linux-tools-4.15.0-249-tuxcare.els37-lowlatency-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-buildinfo-4.15.0-249-tuxcare.els37-generic-0:4.15.0-249.260.amd64", "Ubuntu-18:linux-libc-dev-0:4.15.0-249.260.amd64" ] } ], "threats": [ { "category": "impact", "details": "High" } ] } ] }