Vulnerability-Lookup

GHSA-VM76-7CFX-C7V2

Vulnerability from github – Published: 2025-10-14 21:30 – Updated: 2025-10-14 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

btrfs: release correct delalloc amount in direct IO write path

Running generic/406 causes the following WARNING in btrfs_destroy_inode() which tells there are outstanding extents left.

In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding extents with btrfs_delalloc_reserve_metadata() (or indirectly from btrfs_delalloc_reserve_space(()). We then release the outstanding extents with btrfs_delalloc_release_extents(). However, the "len" can be modified in the COW case, which releases fewer outstanding extents than expected.

Fix it by calling btrfs_delalloc_release_extents() for the original length.

To reproduce the warning, the filesystem should be 1 GiB. It's triggering a short-write, due to not being able to allocate a large extent and instead allocating a smaller one.

WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs] Modules linked in: btrfs blake2b_generic xor lzo_compress lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram zsmalloc CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014 RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs] RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000 RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78 RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8 R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800 R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68 FS: 00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: destroy_inode+0x33/0x70 dispose_list+0x43/0x60 evict_inodes+0x161/0x1b0 generic_shutdown_super+0x2d/0x110 kill_anon_super+0xf/0x20 btrfs_kill_super+0xd/0x20 [btrfs] deactivate_locked_super+0x27/0x90 cleanup_mnt+0x12c/0x180 task_work_run+0x54/0x80 exit_to_user_mode_prepare+0x152/0x160 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x42/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f854a000fb7

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49068"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:00:44Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: release correct delalloc amount in direct IO write path\n\nRunning generic/406 causes the following WARNING in btrfs_destroy_inode()\nwhich tells there are outstanding extents left.\n\nIn btrfs_get_blocks_direct_write(), we reserve a temporary outstanding\nextents with btrfs_delalloc_reserve_metadata() (or indirectly from\nbtrfs_delalloc_reserve_space(()). We then release the outstanding extents\nwith btrfs_delalloc_release_extents(). However, the \"len\" can be modified\nin the COW case, which releases fewer outstanding extents than expected.\n\nFix it by calling btrfs_delalloc_release_extents() for the original length.\n\nTo reproduce the warning, the filesystem should be 1 GiB.  It\u0027s\ntriggering a short-write, due to not being able to allocate a large\nextent and instead allocating a smaller one.\n\n  WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs]\n  Modules linked in: btrfs blake2b_generic xor lzo_compress\n  lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram\n  zsmalloc\n  CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014\n  RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs]\n  RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206\n  RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000\n  RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78\n  RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8\n  R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800\n  R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68\n  FS:  00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n   \u003cTASK\u003e\n   destroy_inode+0x33/0x70\n   dispose_list+0x43/0x60\n   evict_inodes+0x161/0x1b0\n   generic_shutdown_super+0x2d/0x110\n   kill_anon_super+0xf/0x20\n   btrfs_kill_super+0xd/0x20 [btrfs]\n   deactivate_locked_super+0x27/0x90\n   cleanup_mnt+0x12c/0x180\n   task_work_run+0x54/0x80\n   exit_to_user_mode_prepare+0x152/0x160\n   syscall_exit_to_user_mode+0x12/0x30\n   do_syscall_64+0x42/0x80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n   RIP: 0033:0x7f854a000fb7",
  "id": "GHSA-vm76-7cfx-c7v2",
  "modified": "2025-10-14T21:30:25Z",
  "published": "2025-10-14T21:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49068"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07cacfd9d9dc134557ac8866c73d570a59b3d1f3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d82ad13c4110e73c7b0392f00534a1502a1b520"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a04d37ddfe4be431b9e52e8504490376ab0a39a4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49068 (GCVE-0-2022-49068)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-23 15:21

Title

btrfs: release correct delalloc amount in direct IO write path

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: release correct delalloc amount in direct IO write path Running generic/406 causes the following WARNING in btrfs_destroy_inode() which tells there are outstanding extents left. In btrfs_get_blocks_direct_write(), we reserve a temporary outstanding extents with btrfs_delalloc_reserve_metadata() (or indirectly from btrfs_delalloc_reserve_space(()). We then release the outstanding extents with btrfs_delalloc_release_extents(). However, the "len" can be modified in the COW case, which releases fewer outstanding extents than expected. Fix it by calling btrfs_delalloc_release_extents() for the original length. To reproduce the warning, the filesystem should be 1 GiB. It's triggering a short-write, due to not being able to allocate a large extent and instead allocating a smaller one. WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs] Modules linked in: btrfs blake2b_generic xor lzo_compress lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram zsmalloc CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014 RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs] RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000 RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78 RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8 R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800 R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68 FS: 00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> destroy_inode+0x33/0x70 dispose_list+0x43/0x60 evict_inodes+0x161/0x1b0 generic_shutdown_super+0x2d/0x110 kill_anon_super+0xf/0x20 btrfs_kill_super+0xd/0x20 [btrfs] deactivate_locked_super+0x27/0x90 cleanup_mnt+0x12c/0x180 task_work_run+0x54/0x80 exit_to_user_mode_prepare+0x152/0x160 syscall_exit_to_user_mode+0x12/0x30 do_syscall_64+0x42/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f854a000fb7

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/07cacfd9d9dc13455…
https://git.kernel.org/stable/c/a04d37ddfe4be431b…
https://git.kernel.org/stable/c/6d82ad13c4110e73c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5afd80c393f4e87451f14eefb7f2f24daf434e06 , < 07cacfd9d9dc134557ac8866c73d570a59b3d1f3 (git) Affected: f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f , < a04d37ddfe4be431b9e52e8504490376ab0a39a4 (git) Affected: f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f , < 6d82ad13c4110e73c7b0392f00534a1502a1b520 (git) Affected: 96f1be29492d9e2fb97bb27f824478ab8cd3ab86 (git) Affected: 5.15.27 , < 5.15.35 (semver) Affected: 5.16.13 , < 5.17 (semver)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 5.15.35 , ≤ 5.15.* (semver) Unaffected: 5.17.4 , ≤ 5.17.* (semver) Unaffected: 5.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "07cacfd9d9dc134557ac8866c73d570a59b3d1f3",
              "status": "affected",
              "version": "5afd80c393f4e87451f14eefb7f2f24daf434e06",
              "versionType": "git"
            },
            {
              "lessThan": "a04d37ddfe4be431b9e52e8504490376ab0a39a4",
              "status": "affected",
              "version": "f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f",
              "versionType": "git"
            },
            {
              "lessThan": "6d82ad13c4110e73c7b0392f00534a1502a1b520",
              "status": "affected",
              "version": "f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "96f1be29492d9e2fb97bb27f824478ab8cd3ab86",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.35",
              "status": "affected",
              "version": "5.15.27",
              "versionType": "semver"
            },
            {
              "lessThan": "5.17",
              "status": "affected",
              "version": "5.16.13",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.35",
                  "versionStartIncluding": "5.15.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.4",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.16.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: release correct delalloc amount in direct IO write path\n\nRunning generic/406 causes the following WARNING in btrfs_destroy_inode()\nwhich tells there are outstanding extents left.\n\nIn btrfs_get_blocks_direct_write(), we reserve a temporary outstanding\nextents with btrfs_delalloc_reserve_metadata() (or indirectly from\nbtrfs_delalloc_reserve_space(()). We then release the outstanding extents\nwith btrfs_delalloc_release_extents(). However, the \"len\" can be modified\nin the COW case, which releases fewer outstanding extents than expected.\n\nFix it by calling btrfs_delalloc_release_extents() for the original length.\n\nTo reproduce the warning, the filesystem should be 1 GiB.  It\u0027s\ntriggering a short-write, due to not being able to allocate a large\nextent and instead allocating a smaller one.\n\n  WARNING: CPU: 0 PID: 757 at fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs]\n  Modules linked in: btrfs blake2b_generic xor lzo_compress\n  lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram\n  zsmalloc\n  CPU: 0 PID: 757 Comm: umount Not tainted 5.17.0-rc8+ #101\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014\n  RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs]\n  RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206\n  RAX: 0000000000000000 RBX: ffff888100548b78 RCX: 0000000000000000\n  RDX: 0000000000026900 RSI: 0000000000000000 RDI: ffff888100548b78\n  RBP: ffff888100548940 R08: 0000000000000000 R09: ffff88810b48aba8\n  R10: 0000000000000001 R11: ffff8881004eb240 R12: ffff88810b48a800\n  R13: ffff88810b48ec08 R14: ffff88810b48ed00 R15: ffff888100490c68\n  FS:  00007f8549ea0b80(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f854a09e733 CR3: 000000010a2e9003 CR4: 0000000000370eb0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  Call Trace:\n   \u003cTASK\u003e\n   destroy_inode+0x33/0x70\n   dispose_list+0x43/0x60\n   evict_inodes+0x161/0x1b0\n   generic_shutdown_super+0x2d/0x110\n   kill_anon_super+0xf/0x20\n   btrfs_kill_super+0xd/0x20 [btrfs]\n   deactivate_locked_super+0x27/0x90\n   cleanup_mnt+0x12c/0x180\n   task_work_run+0x54/0x80\n   exit_to_user_mode_prepare+0x152/0x160\n   syscall_exit_to_user_mode+0x12/0x30\n   do_syscall_64+0x42/0x80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n   RIP: 0033:0x7f854a000fb7"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:21:30.120Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/07cacfd9d9dc134557ac8866c73d570a59b3d1f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a04d37ddfe4be431b9e52e8504490376ab0a39a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d82ad13c4110e73c7b0392f00534a1502a1b520"
        }
      ],
      "title": "btrfs: release correct delalloc amount in direct IO write path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49068",
    "datePublished": "2025-02-26T01:54:35.340Z",
    "dateReserved": "2025-02-26T01:49:39.244Z",
    "dateUpdated": "2026-05-23T15:21:30.120Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-VM76-7CFX-C7V2

CVE-2022-49068 (GCVE-0-2022-49068)

Tags

Sightings

Nomenclature