{ "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\nocfs2: reject oversized group bitmap descriptors\n\nocfs2_validate_gd_parent() only bounds bg_bits against the parent\nallocator's chain geometry. A malicious descriptor can still claim a\nbg_size/bg_bits pair that exceeds the bitmap bytes that physically fit in\nthe group descriptor block, so later bitmap scans and bit updates can run\npast bg_bitmap.\n\nAdd a physical-cap check based on ocfs2_group_bitmap_size() for the parent\nallocator type and reject descriptors whose bg_size or bg_bits exceed that\ncapacity. Keep the existing chain geometry check so both the on-disk\nbitmap layout and the allocator metadata must agree before the descriptor\nis used.\n\nValidation reproduced this kernel report:\nKASAN use-after-free in _find_next_bit+0x7f/0xc0\nRead of size 8\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xd0/0x630 (?:?)\n _find_next_bit+0x7f/0xc0 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x188/0x2f0 (?:?)\n kasan_report+0xe4/0x120 (?:?)\n ocfs2_find_max_contig_free_bits+0x35/0x70 (fs/ocfs2/suballoc.c:1375)\n ocfs2_block_group_set_bits+0x472/0x4b0 (fs/ocfs2/suballoc.c:1457)\n ocfs2_cluster_group_search+0x16b/0x440 (fs/ocfs2/suballoc.c:86)\n ocfs2_bg_discontig_fix_result+0x1ef/0x230 (fs/ocfs2/suballoc.c:1786)\n ocfs2_search_chain+0x8f8/0x10a0 (fs/ocfs2/suballoc.c:1886)\n get_page_from_freelist+0x70e/0x2370 (?:?)\n lock_release+0xc6/0x290 (?:?)\n do_raw_spin_unlock+0x9a/0x100 (?:?)\n kasan_unpoison+0x27/0x60 (?:?)\n __bfs+0x147/0x240 (?:?)\n get_page_from_freelist+0x83d/0x2370 (?:?)\n ocfs2_claim_suballoc_bits+0x38c/0xe70 (fs/ocfs2/suballoc.c:96)\n sched_domains_numa_masks_clear+0x70/0xd0 (?:?)\n check_irq_usage+0xe8/0xb70 (?:?)\n __ocfs2_claim_clusters+0x18d/0x4c0 (fs/ocfs2/suballoc.c:2497)\n check_path+0x24/0x50 (?:?)\n rcu_is_watching+0x20/0x50 (?:?)\n check_prev_add+0xfd/0xd00 (?:?)\n ocfs2_add_clusters_in_btree+0x17d/0x810 (fs/ocfs2/suballoc.c:?)\n __folio_batch_add_and_move+0x1f5/0x3d0 (?:?)\n ocfs2_add_inode_data+0xd9/0x120 (fs/ocfs2/suballoc.c:?)\n filemap_add_folio+0x105/0x1f0 (?:?)\n ocfs2_write_begin_nolock+0x29f7/0x2f80 (fs/ocfs2/suballoc.c:3043)\n ocfs2_read_inode_block+0xb5/0x110 (fs/ocfs2/suballoc.c:?)\n down_write+0xf5/0x180 (?:?)\n ocfs2_write_begin+0x180/0x240 (fs/ocfs2/suballoc.c:?)\n __mark_inode_dirty+0x758/0x9a0 (?:?)\n inode_to_bdi+0x41/0x90 (?:?)\n balance_dirty_pages_ratelimited_flags+0xf8/0x1d0 (?:?)\n generic_perform_write+0x252/0x440 (?:?)\n mnt_put_write_access_file+0x16/0x70 (?:?)\n file_update_time_flags+0xe4/0x200 (?:?)\n ocfs2_file_write_iter+0x80a/0x1320 (fs/ocfs2/suballoc.c:?)\n lock_acquire+0x184/0x2f0 (?:?)\n ksys_write+0xd2/0x170 (?:?)\n apparmor_file_permission+0xf5/0x310 (?:?)\n read_zero+0x8d/0x140 (?:?)\n lock_is_held_type+0x8f/0x100 (?:?)", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63796" }, { "summary":"CVE-2026-63796 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-63796.json" }, { "summary":"openEuler-SA-2026-3317", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3317" }, { "summary":"CVE-2026-63796", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-63796&packageName=kernel" } ], "title":"openEuler cve CVE-2026-63796", "tracking":{ "initial_release_date":"2026-08-19T11:07:48+08:00", "revision_history":[ { "date":"2026-08-19T11:07:48+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-08-19T11:07:48+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-08-19T11:07:48+08:00", "id":"CVE-2026-63796", "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:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"x86_64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"bpftool-5.10.0-328.0.0.229.oe2203sp4.x86_64.rpm", 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openEuler-22.03-LTS-SP4" }, "category":"default_component_of" } ] }, "vulnerabilities":[ { "cve":"CVE-2026-63796", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject oversized group bitmap descriptors\n\nocfs2_validate_gd_parent() only bounds bg_bits against the parent\nallocator's chain geometry. A malicious descriptor can still claim a\nbg_size/bg_bits pair that exceeds the bitmap bytes that physically fit in\nthe group descriptor block, so later bitmap scans and bit updates can run\npast bg_bitmap.\n\nAdd a physical-cap check based on ocfs2_group_bitmap_size() for the parent\nallocator type and reject descriptors whose bg_size or bg_bits exceed that\ncapacity. Keep the existing chain geometry check so both the on-disk\nbitmap layout and the allocator metadata must agree before the descriptor\nis used.\n\nValidation reproduced this kernel report:\nKASAN use-after-free in _find_next_bit+0x7f/0xc0\nRead of size 8\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xd0/0x630 (?:?)\n _find_next_bit+0x7f/0xc0 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x188/0x2f0 (?:?)\n kasan_report+0xe4/0x120 (?:?)\n ocfs2_find_max_contig_free_bits+0x35/0x70 (fs/ocfs2/suballoc.c:1375)\n ocfs2_block_group_set_bits+0x472/0x4b0 (fs/ocfs2/suballoc.c:1457)\n ocfs2_cluster_group_search+0x16b/0x440 (fs/ocfs2/suballoc.c:86)\n ocfs2_bg_discontig_fix_result+0x1ef/0x230 (fs/ocfs2/suballoc.c:1786)\n ocfs2_search_chain+0x8f8/0x10a0 (fs/ocfs2/suballoc.c:1886)\n get_page_from_freelist+0x70e/0x2370 (?:?)\n lock_release+0xc6/0x290 (?:?)\n do_raw_spin_unlock+0x9a/0x100 (?:?)\n kasan_unpoison+0x27/0x60 (?:?)\n __bfs+0x147/0x240 (?:?)\n get_page_from_freelist+0x83d/0x2370 (?:?)\n ocfs2_claim_suballoc_bits+0x38c/0xe70 (fs/ocfs2/suballoc.c:96)\n sched_domains_numa_masks_clear+0x70/0xd0 (?:?)\n check_irq_usage+0xe8/0xb70 (?:?)\n __ocfs2_claim_clusters+0x18d/0x4c0 (fs/ocfs2/suballoc.c:2497)\n check_path+0x24/0x50 (?:?)\n rcu_is_watching+0x20/0x50 (?:?)\n check_prev_add+0xfd/0xd00 (?:?)\n ocfs2_add_clusters_in_btree+0x17d/0x810 (fs/ocfs2/suballoc.c:?)\n __folio_batch_add_and_move+0x1f5/0x3d0 (?:?)\n ocfs2_add_inode_data+0xd9/0x120 (fs/ocfs2/suballoc.c:?)\n filemap_add_folio+0x105/0x1f0 (?:?)\n ocfs2_write_begin_nolock+0x29f7/0x2f80 (fs/ocfs2/suballoc.c:3043)\n ocfs2_read_inode_block+0xb5/0x110 (fs/ocfs2/suballoc.c:?)\n down_write+0xf5/0x180 (?:?)\n ocfs2_write_begin+0x180/0x240 (fs/ocfs2/suballoc.c:?)\n __mark_inode_dirty+0x758/0x9a0 (?:?)\n inode_to_bdi+0x41/0x90 (?:?)\n balance_dirty_pages_ratelimited_flags+0xf8/0x1d0 (?:?)\n generic_perform_write+0x252/0x440 (?:?)\n mnt_put_write_access_file+0x16/0x70 (?:?)\n file_update_time_flags+0xe4/0x200 (?:?)\n ocfs2_file_write_iter+0x80a/0x1320 (fs/ocfs2/suballoc.c:?)\n lock_acquire+0x184/0x2f0 (?:?)\n ksys_write+0xd2/0x170 (?:?)\n apparmor_file_permission+0xf5/0x310 (?:?)\n read_zero+0x8d/0x140 (?:?)\n lock_is_held_type+0x8f/0x100 (?:?)", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-328.0.0.229.oe2203sp4.x86_64", 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