The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - ocfs2: reject oversized group bitmap descriptors ocfs2_validate_gd_parent() only bounds bg_bits against     the parent allocator's chain geometry. A malicious descriptor can still claim a bg_size/bg_bits pair that     exceeds the bitmap bytes that physically fit in the group descriptor block, so later bitmap scans and bit     updates can run past bg_bitmap. Add a physical-cap check based on ocfs2_group_bitmap_size() for the parent     allocator type and reject descriptors whose bg_size or bg_bits exceed that capacity. Keep the existing     chain geometry check so both the on-disk bitmap layout and the allocator metadata must agree before the     descriptor is used. Validation reproduced this kernel report: KASAN use-after-free in
    _find_next_bit+0x7f/0xc0 Read of size 8 Call trace: dump_stack_lvl+0x66/0xa0 (?:?) print_report+0xd0/0x630     (?:?) _find_next_bit+0x7f/0xc0 (?:?) srso_alias_return_thunk+0x5/0xfbef5 (?:?)
    __virt_addr_valid+0x188/0x2f0 (?:?) kasan_report+0xe4/0x120 (?:?)     ocfs2_find_max_contig_free_bits+0x35/0x70 (fs/ocfs2/suballoc.c:1375)     ocfs2_block_group_set_bits+0x472/0x4b0 (fs/ocfs2/suballoc.c:1457) ocfs2_cluster_group_search+0x16b/0x440     (fs/ocfs2/suballoc.c:86) ocfs2_bg_discontig_fix_result+0x1ef/0x230 (fs/ocfs2/suballoc.c:1786)     ocfs2_search_chain+0x8f8/0x10a0 (fs/ocfs2/suballoc.c:1886) get_page_from_freelist+0x70e/0x2370 (?:?)     lock_release+0xc6/0x290 (?:?) do_raw_spin_unlock+0x9a/0x100 (?:?) kasan_unpoison+0x27/0x60 (?:?)
    __bfs+0x147/0x240 (?:?) get_page_from_freelist+0x83d/0x2370 (?:?) ocfs2_claim_suballoc_bits+0x38c/0xe70     (fs/ocfs2/suballoc.c:96) sched_domains_numa_masks_clear+0x70/0xd0 (?:?) check_irq_usage+0xe8/0xb70 (?:?)
    __ocfs2_claim_clusters+0x18d/0x4c0 (fs/ocfs2/suballoc.c:2497) check_path+0x24/0x50 (?:?)     rcu_is_watching+0x20/0x50 (?:?) check_prev_add+0xfd/0xd00 (?:?) ocfs2_add_clusters_in_btree+0x17d/0x810     (fs/ocfs2/suballoc.c:?) __folio_batch_add_and_move+0x1f5/0x3d0 (?:?) ocfs2_add_inode_data+0xd9/0x120     (fs/ocfs2/suballoc.c:?) filemap_add_folio+0x105/0x1f0 (?:?) ocfs2_write_begin_nolock+0x29f7/0x2f80     (fs/ocfs2/suballoc.c:3043) ocfs2_read_inode_block+0xb5/0x110 (fs/ocfs2/suballoc.c:?) down_write+0xf5/0x180     (?:?) ocfs2_write_begin+0x180/0x240 (fs/ocfs2/suballoc.c:?) __mark_inode_dirty+0x758/0x9a0 (?:?)     inode_to_bdi+0x41/0x90 (?:?) balance_dirty_pages_ratelimited_flags+0xf8/0x1d0 (?:?)     generic_perform_write+0x252/0x440 (?:?) mnt_put_write_access_file+0x16/0x70 (?:?)     file_update_time_flags+0xe4/0x200 (?:?) ocfs2_file_write_iter+0x80a/0x1320 (fs/ocfs2/suballoc.c:?)     lock_acquire+0x184/0x2f0 (?:?) ksys_write+0xd2/0x170 (?:?) apparmor_file_permission+0xf5/0x310 (?:?)     read_zero+0x8d/0x140 (?:?) lock_is_held_type+0x8f/0x100 (?:?) (CVE-2026-63796)

Note that Nessus relies on the presence of the package as reported by the vendor.

Detections

Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-63796

high Nessus Plugin ID 327855

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.4 Aug 6, 2026, 3:43 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202608061543
Version 1.3 Jul 25, 2026, 1:06 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202607251306
Version 1.2 Jul 21, 2026, 12:41 AM CVSS metrics ("CVSSv2 score" set to 5.6) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:C") CVSS metrics ("CVSSv3 score" set to 8.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H") CVSSv2 severity (based on CVE-2026-63796, severity decreased from "High" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202607210041
Version 1.1 Jul 20, 2026, 12:56 AM New Plugin Feed: 202607200056