CVE-2026-80734 (GCVE-0-2026-80734)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-21 13:14
VLAI
Title
btrfs: initialize inode mapping flags for cached inodes
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: initialize inode mapping flags for cached inodes [BUG] When running generic/795 with 8K block size, 4K page size, the test always fails, triggering some ASSERT()s related to folio size: 795 (241074): drop_caches: 3 assertion failed: IS_ALIGNED(start, blocksize) && IS_ALIGNED(end + 1, blocksize), in extent_io.c:1404 (blocksize=8192 root=262 ino=258 start=16826368 end=16830463 mapping min order=0) ------------[ cut here ]------------ kernel BUG at extent_io.c:1404! Oops: invalid opcode: 0000 [#1] SMP CPU: 8 UID: 0 PID: 241105 Comm: fsstress Tainted: G OE 7.2.0-rc5-custom+ #442 PREEMPT(full) f4bfb352566f3949f29c233ce6f735050a03b245 Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:assert_folio_range.cold+0x3d/0x3f [btrfs] Call Trace: <TASK> btrfs_read_folio+0x9e/0x170 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3] prepare_one_folio.constprop.0+0x104/0x2a0 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3] btrfs_buffered_write+0x285/0xa50 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3] btrfs_do_write_iter+0x1aa/0x210 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3] iter_file_splice_write+0x31a/0x540 direct_splice_actor+0x53/0x170 splice_direct_to_actor+0xe9/0x240 do_splice_direct+0x76/0xb0 vfs_copy_file_range+0x1fd/0x630 __x64_sys_copy_file_range+0xf9/0x220 do_syscall_64+0xe1/0x790 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK> ---[ end trace 0000000000000000 ]--- The ASSERT() itself is added by a later patch. The crash is triggered with that new debug patch, and without this fix. [CAUSE] In the above case, the start 16826368 is properly 8K aligned, but the end (16830463 + 1) is not 8K aligned. Furthermore the mapping's minimal folio order is 0, not the expected 1 for 8K block size with 4K page size. So this means some inodes do not have btrfs_set_inode_mapping_order() called on it. The missing btrfs_set_inode_mapping_order() call happens for cached inodes, through the following events: - btrfs_create_new_inode() called for inode X Which properly sets minimal folio order for the VFS inode. - btrfs_update_inode() called for inode X Which calls btrfs_delayed_update_inode() to create a delayed_node into root->delayed_nodes xarray. - Drop cache/memory pressure, evicting in-memory inode X Which evicted the inode X, but delayed_node is still in root->delayed_nodes for future reuse. - btrfs_iget() for inode X called again btrfs_iget() |- btrfs_iget_locked() | |- iget5_locked_rcu() | Which creates a new vfs_inode for btrfs, whose mapping still | has the minimal order as 0. | |- btrfs_read_locked_inode() |- btrfs_fill_inode() | |- btrfs_get_delayed_node() | Which found out the previous node, and use that delayed | node to initialize the new inode. | |- filled = true; |- if (filled) goto cache_index; Which skips the btrfs_update_inode_mapping_flags() and btrfs_set_inode_mapping_order() calls. So the inode still has minimal folio order set as 0, not the required 1. Thus later page cache read will get a folio whose size is smaller than block size, as the mapping has its minimal folio order set as 0 not 1, then trigger the ASSERT(). [FIX] Move the btrfs_update_inode_mapping_flags() and btrfs_set_inode_mapping_order() calls under cache_index label, so that the mapping flags and minimal folio order is always set no matter if we have a cached inode.
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 CPE status
Linux Linux Affected: ecde48a1a6b3256bd49db8780bf37556b157783c , < 0d26249671171ab759cb4fdce673554a690fa655 (git)
Affected: ecde48a1a6b3256bd49db8780bf37556b157783c , < 0ef349734a93227b45f65fc50a3311d1cc5f03e9 (git)
Affected: 01b002151539a4c2b27bfff9af033329a9b659e7 (git)
Affected: ae584726e6eddf6cfbe49b3f4a78b3197716b6f8 (git)
Affected: 6.12.111 , < 6.13 (semver)
Affected: 6.14.6 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/inode.c"
          ],
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          "vendor": "Linux",
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              "version": "01b002151539a4c2b27bfff9af033329a9b659e7",
              "versionType": "git"
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            "fs/btrfs/inode.c"
          ],
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          "vendor": "Linux",
          "versions": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: initialize inode mapping flags for cached inodes\n\n[BUG]\nWhen running generic/795 with 8K block size, 4K page size, the test\nalways fails, triggering some ASSERT()s related to folio size:\n\n  795 (241074): drop_caches: 3\n  assertion failed: IS_ALIGNED(start, blocksize) \u0026\u0026 IS_ALIGNED(end + 1, blocksize), in extent_io.c:1404 (blocksize=8192 root=262 ino=258 start=16826368 end=16830463 mapping min order=0)\n  ------------[ cut here ]------------\n  kernel BUG at extent_io.c:1404!\n  Oops: invalid opcode: 0000 [#1] SMP\n  CPU: 8 UID: 0 PID: 241105 Comm: fsstress Tainted: G           OE       7.2.0-rc5-custom+ #442 PREEMPT(full)  f4bfb352566f3949f29c233ce6f735050a03b245\n  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n  RIP: 0010:assert_folio_range.cold+0x3d/0x3f [btrfs]\n  Call Trace:\n   \u003cTASK\u003e\n   btrfs_read_folio+0x9e/0x170 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   prepare_one_folio.constprop.0+0x104/0x2a0 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   btrfs_buffered_write+0x285/0xa50 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   btrfs_do_write_iter+0x1aa/0x210 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   iter_file_splice_write+0x31a/0x540\n   direct_splice_actor+0x53/0x170\n   splice_direct_to_actor+0xe9/0x240\n   do_splice_direct+0x76/0xb0\n   vfs_copy_file_range+0x1fd/0x630\n   __x64_sys_copy_file_range+0xf9/0x220\n   do_syscall_64+0xe1/0x790\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n   \u003c/TASK\u003e\n  ---[ end trace 0000000000000000 ]---\n\nThe ASSERT() itself is added by a later patch.\nThe crash is triggered with that new debug patch, and without this fix.\n\n[CAUSE]\nIn the above case, the start 16826368 is properly 8K aligned, but the\nend (16830463 + 1) is not 8K aligned.\nFurthermore the mapping\u0027s minimal folio order is 0, not the expected 1\nfor 8K block size with 4K page size.\n\nSo this means some inodes do not have btrfs_set_inode_mapping_order()\ncalled on it.\n\nThe missing btrfs_set_inode_mapping_order() call happens for cached\ninodes, through the following events:\n\n- btrfs_create_new_inode() called for inode X\n  Which properly sets minimal folio order for the VFS inode.\n\n- btrfs_update_inode() called for inode X\n  Which calls btrfs_delayed_update_inode() to create a delayed_node\n  into root-\u003edelayed_nodes xarray.\n\n- Drop cache/memory pressure, evicting in-memory inode X\n  Which evicted the inode X, but delayed_node is still in\n  root-\u003edelayed_nodes for future reuse.\n\n- btrfs_iget() for inode X called again\n\n  btrfs_iget()\n  |- btrfs_iget_locked()\n  |  |- iget5_locked_rcu()\n  |     Which creates a new vfs_inode for btrfs, whose mapping still\n  |     has the minimal order as 0.\n  |\n  |- btrfs_read_locked_inode()\n     |- btrfs_fill_inode()\n     |  |- btrfs_get_delayed_node()\n     |     Which found out the previous node, and use that delayed\n     |     node to initialize the new inode.\n     |\n     |- filled = true;\n     |- if (filled) goto cache_index;\n        Which skips the btrfs_update_inode_mapping_flags() and\n\tbtrfs_set_inode_mapping_order() calls.\n\tSo the inode still has minimal folio order set as 0, not\n\tthe required 1.\n\nThus later page cache read will get a folio whose size is smaller than\nblock size, as the mapping has its minimal folio order set as 0 not 1,\nthen trigger the ASSERT().\n\n[FIX]\nMove the btrfs_update_inode_mapping_flags() and\nbtrfs_set_inode_mapping_order() calls under cache_index label,\nso that the mapping flags and minimal folio order is always set\nno matter if we have a cached inode."
        }
      ],
      "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 - The fault is reached from vfs_copy_file_range/splice buffered-write paths on btrfs inodes (as in the xfstest repro); on NFS-exported btrfs volumes remote clients can drive the same VFS copy_file_range path via nfsd NFSv4 COPY, making this network-reachable on NAS deployments.\nAC:L - Once a btrfs volume uses CONFIG_BTRFS_EXPERIMENTAL blocksize\u003epagesize, an attacker can deterministically create the delayed-node/evict/re-iget sequence with ordinary writes plus memory pressure (xfstest generic/795 reproduces reliably) without uncontrollable races or layout luck.\nPR:L - Triggering requires only write access to files on a mounted btrfs filesystem (or an authenticated NFS/SMB client with export write permission); no init-namespace root or non-namespace capabilities are needed beyond normal filesystem access.\nUI:N - No victim interaction is required; the attacker issues their own copy_file_range/write/splice syscalls (or remote COPY) after creating the inode state, without needing another user to mount, open, or click anything.\nS:U - Impact is confined to incorrect btrfs page-cache I/O and filesystem data/kernel stability on the host; it does not cross VM, container, IOMMU, or other security-authority boundaries.\nC:H - Skipping btrfs_set_inode_mapping_order leaves 4K folios on 8K-sector volumes, so read paths operate on block-misaligned ranges and can return stale adjacent on-disk sectors into attacker buffers, disclosing other users\u0027 btrfs file content on shared volumes.\nI:H - Wrong mapping min folio order and stable-writes flags break btrfs block-aligned buffered I/O invariants, allowing misaligned writes/checksum-unsafe writeback that can persist corrupted data and violate CoW/checksum integrity on the affected volume.\nA:H - The bug provokes kernel BUG/oops via assert_folio_range on misaligned folio ranges (documented in the fix commit), and blocks_per_folio becomes zero when folio_size\u003csectorsize, breaking subpage bitmap assumptions and risking further kernel faults or wedged I/O."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-21T13:14:11.093Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0d26249671171ab759cb4fdce673554a690fa655"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ef349734a93227b45f65fc50a3311d1cc5f03e9"
        }
      ],
      "title": "btrfs: initialize inode mapping flags for cached inodes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80734",
    "datePublished": "2026-09-03T08:21:50.734Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-21T13:14:11.093Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-21",
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      "percentile": "0.28379"
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    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/btrfs/inode.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                  {
                    "status": "affected",
                    "version": "ae584726e6eddf6cfbe49b3f4a78b3197716b6f8",
                    "versionType": "git"
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                ],
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                "vendor": "Linux",
                "versions": [
                  {
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                    "version": "6.15"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: initialize inode mapping flags for cached inodes\n\n[BUG]\nWhen running generic/795 with 8K block size, 4K page size, the test\nalways fails, triggering some ASSERT()s related to folio size:\n\n  795 (241074): drop_caches: 3\n  assertion failed: IS_ALIGNED(start, blocksize) \u0026\u0026 IS_ALIGNED(end + 1, blocksize), in extent_io.c:1404 (blocksize=8192 root=262 ino=258 start=16826368 end=16830463 mapping min order=0)\n  ------------[ cut here ]------------\n  kernel BUG at extent_io.c:1404!\n  Oops: invalid opcode: 0000 [#1] SMP\n  CPU: 8 UID: 0 PID: 241105 Comm: fsstress Tainted: G           OE       7.2.0-rc5-custom+ #442 PREEMPT(full)  f4bfb352566f3949f29c233ce6f735050a03b245\n  Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n  RIP: 0010:assert_folio_range.cold+0x3d/0x3f [btrfs]\n  Call Trace:\n   \u003cTASK\u003e\n   btrfs_read_folio+0x9e/0x170 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   prepare_one_folio.constprop.0+0x104/0x2a0 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   btrfs_buffered_write+0x285/0xa50 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   btrfs_do_write_iter+0x1aa/0x210 [btrfs 4cd1dd93b341b8ef766643f9512f4a86259567a3]\n   iter_file_splice_write+0x31a/0x540\n   direct_splice_actor+0x53/0x170\n   splice_direct_to_actor+0xe9/0x240\n   do_splice_direct+0x76/0xb0\n   vfs_copy_file_range+0x1fd/0x630\n   __x64_sys_copy_file_range+0xf9/0x220\n   do_syscall_64+0xe1/0x790\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n   \u003c/TASK\u003e\n  ---[ end trace 0000000000000000 ]---\n\nThe ASSERT() itself is added by a later patch.\nThe crash is triggered with that new debug patch, and without this fix.\n\n[CAUSE]\nIn the above case, the start 16826368 is properly 8K aligned, but the\nend (16830463 + 1) is not 8K aligned.\nFurthermore the mapping\u0027s minimal folio order is 0, not the expected 1\nfor 8K block size with 4K page size.\n\nSo this means some inodes do not have btrfs_set_inode_mapping_order()\ncalled on it.\n\nThe missing btrfs_set_inode_mapping_order() call happens for cached\ninodes, through the following events:\n\n- btrfs_create_new_inode() called for inode X\n  Which properly sets minimal folio order for the VFS inode.\n\n- btrfs_update_inode() called for inode X\n  Which calls btrfs_delayed_update_inode() to create a delayed_node\n  into root-\u003edelayed_nodes xarray.\n\n- Drop cache/memory pressure, evicting in-memory inode X\n  Which evicted the inode X, but delayed_node is still in\n  root-\u003edelayed_nodes for future reuse.\n\n- btrfs_iget() for inode X called again\n\n  btrfs_iget()\n  |- btrfs_iget_locked()\n  |  |- iget5_locked_rcu()\n  |     Which creates a new vfs_inode for btrfs, whose mapping still\n  |     has the minimal order as 0.\n  |\n  |- btrfs_read_locked_inode()\n     |- btrfs_fill_inode()\n     |  |- btrfs_get_delayed_node()\n     |     Which found out the previous node, and use that delayed\n     |     node to initialize the new inode.\n     |\n     |- filled = true;\n     |- if (filled) goto cache_index;\n        Which skips the btrfs_update_inode_mapping_flags() and\n\tbtrfs_set_inode_mapping_order() calls.\n\tSo the inode still has minimal folio order set as 0, not\n\tthe required 1.\n\nThus later page cache read will get a folio whose size is smaller than\nblock size, as the mapping has its minimal folio order set as 0 not 1,\nthen trigger the ASSERT().\n\n[FIX]\nMove the btrfs_update_inode_mapping_flags() and\nbtrfs_set_inode_mapping_order() calls under cache_index label,\nso that the mapping flags and minimal folio order is always set\nno matter if we have a cached inode."
          }
        ],
        "id": "CVE-2026-80734",
        "lastModified": "2026-09-21T14:17:20.520",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-03T13:06:12.200",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0d26249671171ab759cb4fdce673554a690fa655"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0ef349734a93227b45f65fc50a3311d1cc5f03e9"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.