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

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-23 15:21
VLAI
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted 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)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
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{
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          "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"
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        "dateUpdated": "2026-05-23T15:21:30.120Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6d82ad13c4110e73c7b0392f00534a1502a1b520"
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      "title": "btrfs: release correct delalloc amount in direct IO write path",
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    "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"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49068",
      "date": "2026-08-04",
      "epss": "0.00253",
      "percentile": "0.16817"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49068\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:00:44.027\",\"lastModified\":\"2026-06-17T05:16:59.537\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: libera la cantidad correcta de delalloc en la ruta de escritura de E/S directa. La ejecuci\u00f3n de generic/406 provoca la siguiente ADVERTENCIA en btrfs_destroy_inode() que indica que quedan extensiones pendientes. En btrfs_get_blocks_direct_write(), reservamos extensiones pendientes temporalmente con btrfs_delalloc_reserve_metadata() (o indirectamente desde btrfs_delalloc_reserve_space()). Luego, liberamos las extensiones pendientes con btrfs_delalloc_release_extents(). Sin embargo, la \\\"longitud\\\" se puede modificar en el caso de COW, que libera menos extensiones pendientes de lo esperado. Arr\u00e9glelo llamando a btrfs_delalloc_release_extents() para la longitud original. Para reproducir la advertencia, el sistema de archivos debe ser de 1 GiB. Est\u00e1 activando una escritura corta, debido a que no se puede asignar una extensi\u00f3n grande y, en su lugar, se asigna una m\u00e1s peque\u00f1a. ADVERTENCIA: CPU: 0 PID: 757 en fs/btrfs/inode.c:8848 btrfs_destroy_inode+0x1e6/0x210 [btrfs] M\u00f3dulos vinculados en: btrfs blake2b_generic xor lzo_compress lzo_decompress raid6_pq zstd zstd_decompress zstd_compress xxhash zram zsmalloc CPU: 0 PID: 757 Comm: umount No contaminado 5.17.0-rc8+ #101 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS d55cb5a 01/04/2014 RIP: 0010:btrfs_destroy_inode+0x1e6/0x210 [btrfs] RSP: 0018:ffffc9000327bda8 EFLAGS: 00010206 RAX: 000000000000000 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: 00000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:  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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/btrfs/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5afd80c393f4e87451f14eefb7f2f24daf434e06\",\"lessThan\":\"07cacfd9d9dc134557ac8866c73d570a59b3d1f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f\",\"lessThan\":\"a04d37ddfe4be431b9e52e8504490376ab0a39a4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f\",\"lessThan\":\"6d82ad13c4110e73c7b0392f00534a1502a1b520\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96f1be29492d9e2fb97bb27f824478ab8cd3ab86\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.27\",\"lessThan\":\"5.15.35\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.16.13\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/btrfs/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.35\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17.4\",\"lessThanOrEqual\":\"5.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.27\",\"versionEndExcluding\":\"5.15.35\",\"matchCriteriaId\":\"4960A935-FD5B-4178-93FD-54F8B8F87E05\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.13\",\"versionEndExcluding\":\"5.17.4\",\"matchCriteriaId\":\"38DDBA33-1800-441A-9B01-A0A816DFB0C4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6AD94161-84BB-42E6-9882-4FC0C42E9FC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"7AB06DDF-3C2B-416D-B448-E990D8FF67A9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07cacfd9d9dc134557ac8866c73d570a59b3d1f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6d82ad13c4110e73c7b0392f00534a1502a1b520\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a04d37ddfe4be431b9e52e8504490376ab0a39a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T20:55:23+00:00",
      "cve": "CVE-2022-49068",
      "id": "CVE-2022-49068",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "232",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: release correct delalloc amount in direct IO write path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49068.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-13T15:08:20Z",
      "cve": "CVE-2022-49068",
      "id": "CVE-2022-49068",
      "initial_release_date": "2025-02-27T03:12:46Z",
      "product_status:known_not_affected": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49068",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49068.json",
      "version": "11"
    }
  }
}



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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.