{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "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\njffs2: fix use-after-free in jffs2_clear_xattr_subsystem\n\nWhen we mount a jffs2 image, assume that the first few blocks of\nthe image are normal and contain at least one xattr-related inode,\nbut the next block is abnormal. As a result, an error is returned\nin jffs2_scan_eraseblock(). jffs2_clear_xattr_subsystem() is then\ncalled in jffs2_build_filesystem() and then again in\njffs2_do_fill_super().\n\nFinally we can observe the following report:\n ==================================================================\n BUG: KASAN: use-after-free in jffs2_clear_xattr_subsystem+0x95/0x6ac\n Read of size 8 at addr ffff8881243384e0 by task mount/719\n\n Call Trace:\n dump_stack+0x115/0x16b\n jffs2_clear_xattr_subsystem+0x95/0x6ac\n jffs2_do_fill_super+0x84f/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n mtd_get_sb+0x254/0x400\n mtd_get_sb_by_nr+0x4f/0xd0\n get_tree_mtd+0x498/0x840\n jffs2_get_tree+0x25/0x30\n vfs_get_tree+0x8d/0x2e0\n path_mount+0x50f/0x1e50\n do_mount+0x107/0x130\n __se_sys_mount+0x1c5/0x2f0\n __x64_sys_mount+0xc7/0x160\n do_syscall_64+0x45/0x70\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\n Allocated by task 719:\n kasan_save_stack+0x23/0x60\n __kasan_kmalloc.constprop.0+0x10b/0x120\n kasan_slab_alloc+0x12/0x20\n kmem_cache_alloc+0x1c0/0x870\n jffs2_alloc_xattr_ref+0x2f/0xa0\n jffs2_scan_medium.cold+0x3713/0x4794\n jffs2_do_mount_fs.cold+0xa7/0x2253\n jffs2_do_fill_super+0x383/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n [...]\n\n Freed by task 719:\n kmem_cache_free+0xcc/0x7b0\n jffs2_free_xattr_ref+0x78/0x98\n jffs2_clear_xattr_subsystem+0xa1/0x6ac\n jffs2_do_mount_fs.cold+0x5e6/0x2253\n jffs2_do_fill_super+0x383/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n [...]\n\n The buggy address belongs to the object at ffff8881243384b8\n which belongs to the cache jffs2_xattr_ref of size 48\n The buggy address is located 40 bytes inside of\n 48-byte region [ffff8881243384b8, ffff8881243384e8)\n [...]\n ==================================================================\n\nThe triggering of the BUG is shown in the following stack:\n-----------------------------------------------------------\njffs2_fill_super\n jffs2_do_fill_super\n jffs2_do_mount_fs\n jffs2_build_filesystem\n jffs2_scan_medium\n jffs2_scan_eraseblock <--- ERROR\n jffs2_clear_xattr_subsystem <--- free\n jffs2_clear_xattr_subsystem <--- free again\n-----------------------------------------------------------\n\nAn error is returned in jffs2_do_mount_fs(). If the error is returned\nby jffs2_sum_init(), the jffs2_clear_xattr_subsystem() does not need to\nbe executed. If the error is returned by jffs2_build_filesystem(), the\njffs2_clear_xattr_subsystem() also does not need to be executed again.\nSo move jffs2_clear_xattr_subsystem() from 'out_inohash' to 'out_root'\nto fix this UAF problem.", "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-2021-47656" }, { "summary":"CVE-2021-47656 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2021/csaf-openeuler-cve-2021-47656.json" }, { "summary":"openEuler-SA-2025-1317", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1317" }, { "summary":"CVE-2021-47656", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-47656&packageName=kernel" } ], "title":"openEuler cve CVE-2021-47656", "tracking":{ "initial_release_date":"2025-03-21T21:19:32+08:00", "revision_history":[ { "date":"2025-03-21T21:19:32+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2025-03-21T21:19:32+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-03-21T21:19:32+08:00", "id":"CVE-2021-47656", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP4" }, "product_id":"openEuler-20.03-LTS-SP4", "name":"openEuler-20.03-LTS-SP4" }, "name":"openEuler-20.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ 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As a result, an error is returned\nin jffs2_scan_eraseblock(). jffs2_clear_xattr_subsystem() is then\ncalled in jffs2_build_filesystem() and then again in\njffs2_do_fill_super().\n\nFinally we can observe the following report:\n ==================================================================\n BUG: KASAN: use-after-free in jffs2_clear_xattr_subsystem+0x95/0x6ac\n Read of size 8 at addr ffff8881243384e0 by task mount/719\n\n Call Trace:\n dump_stack+0x115/0x16b\n jffs2_clear_xattr_subsystem+0x95/0x6ac\n jffs2_do_fill_super+0x84f/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n mtd_get_sb+0x254/0x400\n mtd_get_sb_by_nr+0x4f/0xd0\n get_tree_mtd+0x498/0x840\n jffs2_get_tree+0x25/0x30\n vfs_get_tree+0x8d/0x2e0\n path_mount+0x50f/0x1e50\n do_mount+0x107/0x130\n __se_sys_mount+0x1c5/0x2f0\n __x64_sys_mount+0xc7/0x160\n do_syscall_64+0x45/0x70\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\n Allocated by task 719:\n kasan_save_stack+0x23/0x60\n __kasan_kmalloc.constprop.0+0x10b/0x120\n kasan_slab_alloc+0x12/0x20\n kmem_cache_alloc+0x1c0/0x870\n jffs2_alloc_xattr_ref+0x2f/0xa0\n jffs2_scan_medium.cold+0x3713/0x4794\n jffs2_do_mount_fs.cold+0xa7/0x2253\n jffs2_do_fill_super+0x383/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n [...]\n\n Freed by task 719:\n kmem_cache_free+0xcc/0x7b0\n jffs2_free_xattr_ref+0x78/0x98\n jffs2_clear_xattr_subsystem+0xa1/0x6ac\n jffs2_do_mount_fs.cold+0x5e6/0x2253\n jffs2_do_fill_super+0x383/0xc30\n jffs2_fill_super+0x2ea/0x4c0\n [...]\n\n The buggy address belongs to the object at ffff8881243384b8\n which belongs to the cache jffs2_xattr_ref of size 48\n The buggy address is located 40 bytes inside of\n 48-byte region [ffff8881243384b8, ffff8881243384e8)\n [...]\n ==================================================================\n\nThe triggering of the BUG is shown in the following stack:\n-----------------------------------------------------------\njffs2_fill_super\n jffs2_do_fill_super\n jffs2_do_mount_fs\n jffs2_build_filesystem\n jffs2_scan_medium\n jffs2_scan_eraseblock <--- ERROR\n jffs2_clear_xattr_subsystem <--- free\n jffs2_clear_xattr_subsystem <--- free again\n-----------------------------------------------------------\n\nAn error is returned in jffs2_do_mount_fs(). If the error is returned\nby jffs2_sum_init(), the jffs2_clear_xattr_subsystem() does not need to\nbe executed. If the error is returned by jffs2_build_filesystem(), the\njffs2_clear_xattr_subsystem() also does not need to be executed again.\nSo move jffs2_clear_xattr_subsystem() from 'out_inohash' to 'out_root'\nto fix this UAF problem.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", 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"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1317" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":5.5, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-debuginfo-4.19.90-2503.4.0.0320.oe2003sp4.aarch64", 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"details":"Medium", "category":"impact" } ], "title":"CVE-2021-47656" } ] }