{ "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/oraclelinux6els/vex/2021/cve-2021-47636-els_os-oraclelinux6els.json" } ], "title": "Security update on CVE-2021-47636", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2021-47636-ELS_OS-ORACLELINUX6ELS", "initial_release_date": "2021-01-01T00:00:00Z", "revision_history": [ { "date": "2021-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-05-27T17:10:12Z", "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": "Oracle Linux 6", "product": { "name": "Oracle Linux 6", "product_id": "Oracle-Linux-6", "product_identification_helper": { "cpe": "cpe:2.3:o:oracle:linux:6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle Corporation" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product": { "name": "python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_id": "python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/python-perf@2.6.32-754.35.8.el6.tuxcare.els22?arch=x86_64" } } }, { "category": "product_version", "name": 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"pkg:rpm/cloudlinux/kernel@2.6.32-754.35.8.el6.tuxcare.els22?arch=x86_64" } } }, { "category": "product_version", "name": "kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product": { "name": "kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_id": "kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-devel@2.6.32-754.35.8.el6.tuxcare.els22?arch=x86_64" } } }, { "category": "product_version", "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product": { "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_id": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-debug-devel@2.6.32-754.35.8.el6.tuxcare.els22?arch=x86_64" } } }, { "category": "product_version", "name": "kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product": { "name": "kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_id": "kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-headers@2.6.32-754.35.8.el6.tuxcare.els22?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product": { "name": "kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product_id": "kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-abi-whitelists@2.6.32-754.35.8.el6.tuxcare.els22?arch=noarch" } } }, { "category": "product_version", "name": "kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product": { "name": "kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product_id": "kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-doc@2.6.32-754.35.8.el6.tuxcare.els22?arch=noarch" } } } ], "category": "architecture", "name": "noarch" }, { "branches": [ { "category": "product_version", "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "product": { "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "product_id": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/kernel-debug-devel@2.6.32-754.35.8.el6.tuxcare.els22?arch=i686" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch" }, "product_reference": "kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-debug-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-debug-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "kernel-debug-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "kernel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686" }, "product_reference": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch" }, "product_reference": "kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" }, "product_reference": "kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "relates_to_product_reference": "Oracle-Linux-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2021-47636", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()\n\nFunction ubifs_wbuf_write_nolock() may access buf out of bounds in\nfollowing process:\n\nubifs_wbuf_write_nolock():\n aligned_len = ALIGN(len, 8); // Assume len = 4089, aligned_len = 4096\n if (aligned_len <= wbuf->avail) ... // Not satisfy\n if (wbuf->used) {\n ubifs_leb_write() // Fill some data in avail wbuf\n len -= wbuf->avail; // len is still not 8-bytes aligned\n aligned_len -= wbuf->avail;\n }\n n = aligned_len >> c->max_write_shift;\n if (n) {\n n <<= c->max_write_shift;\n err = ubifs_leb_write(c, wbuf->lnum, buf + written,\n wbuf->offs, n);\n // n > len, read out of bounds less than 8(n-len) bytes\n }\n\n, which can be catched by KASAN:\n =========================================================\n BUG: KASAN: slab-out-of-bounds in ecc_sw_hamming_calculate+0x1dc/0x7d0\n Read of size 4 at addr ffff888105594ff8 by task kworker/u8:4/128\n Workqueue: writeback wb_workfn (flush-ubifs_0_0)\n Call Trace:\n kasan_report.cold+0x81/0x165\n nand_write_page_swecc+0xa9/0x160\n ubifs_leb_write+0xf2/0x1b0 [ubifs]\n ubifs_wbuf_write_nolock+0x421/0x12c0 [ubifs]\n write_head+0xdc/0x1c0 [ubifs]\n ubifs_jnl_write_inode+0x627/0x960 [ubifs]\n wb_workfn+0x8af/0xb80\n\nFunction ubifs_wbuf_write_nolock() accepts that parameter 'len' is not 8\nbytes aligned, the 'len' represents the true length of buf (which is\nallocated in 'ubifs_jnl_xxx', eg. ubifs_jnl_write_inode), so\nubifs_wbuf_write_nolock() must handle the length read from 'buf' carefully\nto write leb safely.\n\nFetch a reproducer in [Link].", "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": [ "Oracle-Linux-6:python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "Oracle-Linux-6:kernel-debug-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "Oracle-Linux-6:kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47636" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/07a209fadee7b53b46858538e1177597273862e4", "url": "https://git.kernel.org/stable/c/07a209fadee7b53b46858538e1177597273862e4" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/3b7fb89135a20587d57f8877c02e25003e9edbdf", "url": "https://git.kernel.org/stable/c/3b7fb89135a20587d57f8877c02e25003e9edbdf" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4f2262a334641e05f645364d5ade1f565c85f20b", "url": "https://git.kernel.org/stable/c/4f2262a334641e05f645364d5ade1f565c85f20b" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5343575aa11c5d7044107d59d43f84aec01312b0", "url": "https://git.kernel.org/stable/c/5343575aa11c5d7044107d59d43f84aec01312b0" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a7054aaf1909cf40489c0ec1b728fdcf79c751a6", "url": "https://git.kernel.org/stable/c/a7054aaf1909cf40489c0ec1b728fdcf79c751a6" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b80ccbec0e4804436c382d7dd60e943c386ed83a", "url": "https://git.kernel.org/stable/c/b80ccbec0e4804436c382d7dd60e943c386ed83a" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e09fa5318d51f522e1af4fbaf8f74999355980c8", "url": "https://git.kernel.org/stable/c/e09fa5318d51f522e1af4fbaf8f74999355980c8" } ], "release_date": "2025-02-26T06:37:00", "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": [ "Oracle-Linux-6:python-perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:perf-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-abi-whitelists-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "Oracle-Linux-6:kernel-debug-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.i686", "Oracle-Linux-6:kernel-debug-devel-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64", "Oracle-Linux-6:kernel-doc-0:2.6.32-754.35.8.el6.tuxcare.els22.noarch", "Oracle-Linux-6:kernel-headers-0:2.6.32-754.35.8.el6.tuxcare.els22.x86_64" ] } ], "threats": [ { "category": "impact", "details": "High" } ] } ] }