{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Prevent file descriptor table allocations exceeding INT_MAX\n\nWhen sysctl_nr_open is set to a very high value (for example, 1073741816\nas set by systemd), processes attempting to use file descriptors near\nthe limit can trigger massive memory allocation attempts that exceed\nINT_MAX, resulting in a WARNING in mm/slub.c:\n\n WARNING: CPU: 0 PID: 44 at mm/slub.c:5027 __kvmalloc_node_noprof+0x21a/0x288\n\nThis happens because kvmalloc_array() and kvmalloc() check if the\nrequested size exceeds INT_MAX and emit a warning when the allocation is\nnot flagged with __GFP_NOWARN.\n\nSpecifically, when nr_open is set to 1073741816 (0x3ffffff8) and a\nprocess calls dup2(oldfd, 1073741880), the kernel attempts to allocate:\n- File descriptor array: 1073741880 * 8 bytes = 8,589,935,040 bytes\n- Multiple bitmaps: ~400MB\n- Total allocation size: > 8GB (exceeding INT_MAX = 2,147,483,647)\n\nReproducer:\n1. Set /proc/sys/fs/nr_open to 1073741816:\n # echo 1073741816 > /proc/sys/fs/nr_open\n\n2. Run a program that uses a high file descriptor:\n #include \n #include \n\n int main() {\n struct rlimit rlim = {1073741824, 1073741824};\n setrlimit(RLIMIT_NOFILE, &rlim);\n dup2(2, 1073741880); // Triggers the warning\n return 0;\n }\n\n3. Observe WARNING in dmesg at mm/slub.c:5027\n\nsystemd commit a8b627a introduced automatic bumping of fs.nr_open to the\nmaximum possible value. The rationale was that systems with memory\ncontrol groups (memcg) no longer need separate file descriptor limits\nsince memory is properly accounted. However, this change overlooked\nthat:\n\n1. The kernel's allocation functions still enforce INT_MAX as a maximum\n size regardless of memcg accounting\n2. Programs and tests that legitimately test file descriptor limits can\n inadvertently trigger massive allocations\n3. The resulting allocations (>8GB) are impractical and will always fail\n\nsystemd's algorithm starts with INT_MAX and keeps halving the value\nuntil the kernel accepts it. On most systems, this results in nr_open\nbeing set to 1073741816 (0x3ffffff8), which is just under 1GB of file\ndescriptors.\n\nWhile processes rarely use file descriptors near this limit in normal\noperation, certain selftests (like\ntools/testing/selftests/core/unshare_test.c) and programs that test file\ndescriptor limits can trigger this issue.\n\nFix this by adding a check in alloc_fdtable() to ensure the requested\nallocation size does not exceed INT_MAX. This causes the operation to\nfail with -EMFILE instead of triggering a kernel warning and avoids the\nimpractical >8GB memory allocation request.", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39756" }, { "summary":"CVE-2025-39756 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2025/csaf-openeuler-cve-2025-39756.json" }, { "summary":"openEuler-SA-2025-2886", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2886" }, { "summary":"CVE-2025-39756", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-39756&packageName=kernel" }, { "summary":"openEuler-SA-2025-2887", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2887" } ], "title":"openEuler cve CVE-2025-39756", "tracking":{ "initial_release_date":"2025-12-31T10:23:30+08:00", "revision_history":[ { "date":"2025-12-31T10:23:30+08:00", "summary":"Initial", "number":"1.0.0" }, { "date":"2025-12-31T10:23:32+08:00", "summary":"Current version", "number":"2.0.0" } ], "generator":{ "date":"2025-12-31T10:23:32+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-12-31T10:23:32+08:00", "id":"CVE-2025-39756", "version":"2.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP3" }, "product_id":"openEuler-22.03-LTS-SP3", "name":"openEuler-22.03-LTS-SP3" }, 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allocation attempts that exceed\nINT_MAX, resulting in a WARNING in mm/slub.c:\n\n WARNING: CPU: 0 PID: 44 at mm/slub.c:5027 __kvmalloc_node_noprof+0x21a/0x288\n\nThis happens because kvmalloc_array() and kvmalloc() check if the\nrequested size exceeds INT_MAX and emit a warning when the allocation is\nnot flagged with __GFP_NOWARN.\n\nSpecifically, when nr_open is set to 1073741816 (0x3ffffff8) and a\nprocess calls dup2(oldfd, 1073741880), the kernel attempts to allocate:\n- File descriptor array: 1073741880 * 8 bytes = 8,589,935,040 bytes\n- Multiple bitmaps: ~400MB\n- Total allocation size: > 8GB (exceeding INT_MAX = 2,147,483,647)\n\nReproducer:\n1. Set /proc/sys/fs/nr_open to 1073741816:\n # echo 1073741816 > /proc/sys/fs/nr_open\n\n2. Run a program that uses a high file descriptor:\n #include \n #include \n\n int main() {\n struct rlimit rlim = {1073741824, 1073741824};\n setrlimit(RLIMIT_NOFILE, &rlim);\n dup2(2, 1073741880); // Triggers the warning\n return 0;\n }\n\n3. Observe WARNING in dmesg at mm/slub.c:5027\n\nsystemd commit a8b627a introduced automatic bumping of fs.nr_open to the\nmaximum possible value. The rationale was that systems with memory\ncontrol groups (memcg) no longer need separate file descriptor limits\nsince memory is properly accounted. However, this change overlooked\nthat:\n\n1. The kernel's allocation functions still enforce INT_MAX as a maximum\n size regardless of memcg accounting\n2. Programs and tests that legitimately test file descriptor limits can\n inadvertently trigger massive allocations\n3. The resulting allocations (>8GB) are impractical and will always fail\n\nsystemd's algorithm starts with INT_MAX and keeps halving the value\nuntil the kernel accepts it. On most systems, this results in nr_open\nbeing set to 1073741816 (0x3ffffff8), which is just under 1GB of file\ndescriptors.\n\nWhile processes rarely use file descriptors near this limit in normal\noperation, certain selftests (like\ntools/testing/selftests/core/unshare_test.c) and programs that test file\ndescriptor limits can trigger this issue.\n\nFix this by adding a check in alloc_fdtable() to ensure the requested\nallocation size does not exceed INT_MAX. This causes the operation to\nfail with -EMFILE instead of triggering a kernel warning and avoids the\nimpractical >8GB memory allocation request.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP3:kernel-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-debuginfo-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-debugsource-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-devel-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-headers-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-source-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-tools-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-tools-debuginfo-5.10.0-296.0.0.198.oe2203sp3.aarch64", "openEuler-22.03-LTS-SP3:kernel-tools-devel-5.10.0-296.0.0.198.oe2203sp3.aarch64", 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"openEuler-22.03-LTS-SP4:python3-perf-5.10.0-296.0.0.199.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-debuginfo-5.10.0-296.0.0.199.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-296.0.0.199.oe2203sp4.src" ] } ], "threats":[ { "details":"Low", "category":"impact" } ], "title":"CVE-2025-39756" } ] }