CVE-2026-63796 (GCVE-0-2026-63796)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-05 12:35
VLAI
Title
ocfs2: reject oversized group bitmap descriptors
Summary
In the Linux kernel, the following vulnerability has been resolved: 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 (?:?)
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 336340a0f8a141df8a4eb21a5a86f8ffb87769f6 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 296c6a42b1174395935ca4cfe8f393e37b698d54 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < d2cd59fa848f9f13796ef214d3b1b5ca9a3fe21e (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < c5a125eadba05ba421c4b55e68da22b4a40d32b4 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 8f9903b0cdbb3155a8899410330b4b4d583a7a5c (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 4cd57ebee395041099fcdfcabb00749ce38d8b27 (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 99c21e7263248c3f084756bfae08163cc5d6c62f (git)
Affected: ccd979bdbce9fba8412beb3f1de68a9d0171b12c , < 9bd541e09dffff27e5bec0f9f45b0228173a5375 (git)
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Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
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              "lessThanOrEqual": "6.18.*",
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "2.6.16",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.211",
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                  "vulnerable": true
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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 (?:?)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - OCFS2 registers `ocfs2_export_ops` and is commonly deployed on shared cluster storage exported via NFS; a remote NFS client write reaches `ocfs2_file_write_iter` \u2192 cluster allocation \u2192 the vulnerable bitmap scan without local shell access on the server.\nAC:L - Once a crafted group descriptor with oversized `bg_size`/`bg_bits` is on disk, a single file write reliably drives `ocfs2_find_max_contig_free_bits()` past `bg_bitmap`; the fix commit reproduced this deterministically under KASAN with no race or layout-dependent conditions.\nPR:L - Exploitation requires only write access to a file on the mounted OCFS2 volume (local unprivileged user) or equivalent NFS write credentials; mounting requires `CAP_SYS_ADMIN` but metadata planting on shared SAN/iSCSI LUNs is separate from the trigger privilege.\nUI:N - In the highest-impact scenario\u2014malicious group-descriptor metadata pre-placed on shared cluster storage already mounted in production\u2014the attacker triggers the bug with their own write and no additional victim action (mount, open, or click) is required at exploit time.\nS:U - The bug corrupts kernel heap memory during in-kernel filesystem allocation on the same host/NFS server; impact stays within the kernel\u2019s security authority and does not inherently cross VM, container, or IOMMU boundaries.\nC:H - Oversized `bg_bits` causes `_find_next_bit()` to read past the physical `bg_bitmap` region; the fix commit documents a KASAN use-after-free/out-of-bounds read, which is an arbitrary kernel memory read primitive under attacker-influenced scan bounds.\nI:H - The same inflated `bg_bits` drives `ocfs2_set_bit()` during `ocfs2_block_group_set_bits()`, enabling out-of-bounds writes in the group-descriptor buffer page that can be leveraged for heap corruption and control-flow hijacking.\nA:H - The reproduced KASAN fault in `_find_next_bit()` during cluster allocation on write demonstrates kernel memory corruption that causes oops/panic-level availability loss on affected nodes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:35:45.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/336340a0f8a141df8a4eb21a5a86f8ffb87769f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/296c6a42b1174395935ca4cfe8f393e37b698d54"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2cd59fa848f9f13796ef214d3b1b5ca9a3fe21e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5a125eadba05ba421c4b55e68da22b4a40d32b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f9903b0cdbb3155a8899410330b4b4d583a7a5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cd57ebee395041099fcdfcabb00749ce38d8b27"
        },
        {
          "url": "https://git.kernel.org/stable/c/99c21e7263248c3f084756bfae08163cc5d6c62f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bd541e09dffff27e5bec0f9f45b0228173a5375"
        }
      ],
      "title": "ocfs2: reject oversized group bitmap descriptors",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63796",
    "datePublished": "2026-07-19T12:02:04.634Z",
    "dateReserved": "2026-07-19T07:54:57.012Z",
    "dateUpdated": "2026-08-05T12:35:45.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63796",
      "date": "2026-08-11",
      "epss": "0.00455",
      "percentile": "0.37438"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-21T01:44:23.000Z",
      "cve": "CVE-2026-63796",
      "id": "msrc_CVE-2026-63796",
      "initial_release_date": "2026-07-20T01:06:42.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ocfs2: reject oversized group bitmap descriptors",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63796.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63796\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:52.033\",\"lastModified\":\"2026-07-30T17:38:47.220\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s 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 (?:?)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/suballoc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"336340a0f8a141df8a4eb21a5a86f8ffb87769f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"296c6a42b1174395935ca4cfe8f393e37b698d54\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"d2cd59fa848f9f13796ef214d3b1b5ca9a3fe21e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"c5a125eadba05ba421c4b55e68da22b4a40d32b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"8f9903b0cdbb3155a8899410330b4b4d583a7a5c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"4cd57ebee395041099fcdfcabb00749ce38d8b27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"99c21e7263248c3f084756bfae08163cc5d6c62f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccd979bdbce9fba8412beb3f1de68a9d0171b12c\",\"lessThan\":\"9bd541e09dffff27e5bec0f9f45b0228173a5375\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/suballoc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.16\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"524F7CF4-3630-49FE-B714-8F1D8D7A6185\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.211\",\"matchCriteriaId\":\"D71C101E-388C-4A46-BD99-49049F7C5CFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.177\",\"matchCriteriaId\":\"333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.144\",\"matchCriteriaId\":\"C8AD3BC8-C843-423C-B9DB-CB52F67F578E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.95\",\"matchCriteriaId\":\"4E206B86-E0E3-4394-A93F-39F2D50A8AA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.38\",\"matchCriteriaId\":\"FA591B28-5D62-449E-BDBE-3C9391BF070A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.1.3\",\"matchCriteriaId\":\"9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/296c6a42b1174395935ca4cfe8f393e37b698d54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/336340a0f8a141df8a4eb21a5a86f8ffb87769f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4cd57ebee395041099fcdfcabb00749ce38d8b27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8f9903b0cdbb3155a8899410330b4b4d583a7a5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/99c21e7263248c3f084756bfae08163cc5d6c62f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9bd541e09dffff27e5bec0f9f45b0228173a5375\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c5a125eadba05ba421c4b55e68da22b4a40d32b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d2cd59fa848f9f13796ef214d3b1b5ca9a3fe21e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:04:52+00:00",
      "cve": "CVE-2026-63796",
      "id": "CVE-2026-63796",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: reject oversized group bitmap descriptors",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63796.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-02T16:37:15Z",
      "cve": "CVE-2026-63796",
      "id": "CVE-2026-63796",
      "initial_release_date": "2026-07-19T17:35:10Z",
      "product_status:known_affected": "298",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63796",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63796.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.