FKIE_CVE-2022-49068
Vulnerability from fkie_nvd - Published: 2025-02-26 07:00 - Updated: 2026-06-17 05:16
Severity
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
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.18 | |
| linux | linux_kernel | 5.18 |
{
"affected": [
{
"affectedData": [
{
"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"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4960A935-FD5B-4178-93FD-54F8B8F87E05",
"versionEndExcluding": "5.15.35",
"versionStartIncluding": "5.15.27",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "38DDBA33-1800-441A-9B01-A0A816DFB0C4",
"versionEndExcluding": "5.17.4",
"versionStartIncluding": "5.16.13",
"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",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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"
}
],
"id": "CVE-2022-49068",
"lastModified": "2026-06-17T05:16:59.537",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-02-26T07:00:44.027",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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