CVE-2026-74722 (GCVE-0-2026-74722)
Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33
VLAI
EPSS
VEX
Title
btrfs: fix memory leak in btrfs_do_encoded_write()
Summary
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix memory leak in btrfs_do_encoded_write()
Local fuzzing of 6.12.94 has found the following memory leak:
Unreferenced object 0xffff888018050a80 (size 64):
comm "syz.0.17", pid 10297, jiffies 4294953601
hex dump (first 32 bytes):
00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................
10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................
backtrace (crc a8a6fc29):
kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
slab_post_alloc_hook mm/slub.c:4152 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
__kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:878 [inline]
extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]
qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305
btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355
btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746
btrfs_encoded_write fs/btrfs/file.c:1482 [inline]
btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507
btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738
btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Unreferenced object 0xffff888018050a00 (size 64):
comm "syz.0.17", pid 10297, jiffies 4294953601
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................
90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................
backtrace (crc cb5c9580):
kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
slab_post_alloc_hook mm/slub.c:4152 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
__kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:878 [inline]
kzalloc_noprof include/linux/slab.h:1014 [inline]
ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114
extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]
__set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086
set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821
qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312
btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355
btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746
btrfs_encoded_write fs/btrfs/file.c:1482 [inline]
btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507
btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738
btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Fix this by freeing an extent changeset before returning from
btrfs_do_encoded_write().
Severity
No CVSS data available.
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0
(git)
Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47 (git) Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 20c0eeb4313f9f89d47b80b672b5846f9827cb31 (git) Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 24a8f2c29aebb753ccb962fbb25bae18d7978f6e (git) Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < 60b50ceba6243802f8d2c0a9a7c2d549a93b1d64 (git) Affected: 7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22 , < d2a4e4e626b2f4670b69b430c357f03f53eb6632 (git) |
guessed | |
| Linux | Linux |
Affected:
5.18
Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"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": [
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
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"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "60b50ceba6243802f8d2c0a9a7c2d549a93b1d64",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "d2a4e4e626b2f4670b69b430c357f03f53eb6632",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
}
]
},
{
"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": "5.18"
},
{
"lessThan": "5.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.152",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.104",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.45",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.9",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in btrfs_do_encoded_write()\n\nLocal fuzzing of 6.12.94 has found the following memory leak:\n\nUnreferenced object 0xffff888018050a80 (size 64):\n comm \"syz.0.17\", pid 10297, jiffies 4294953601\n hex dump (first 32 bytes):\n 00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................\n 10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................\n backtrace (crc a8a6fc29):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUnreferenced object 0xffff888018050a00 (size 64):\n comm \"syz.0.17\", pid 10297, jiffies 4294953601\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................\n 90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................\n backtrace (crc cb5c9580):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n kzalloc_noprof include/linux/slab.h:1014 [inline]\n ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by freeing an extent changeset before returning from\nbtrfs_do_encoded_write()."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-22T15:33:14.582Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0"
},
{
"url": "https://git.kernel.org/stable/c/e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47"
},
{
"url": "https://git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31"
},
{
"url": "https://git.kernel.org/stable/c/24a8f2c29aebb753ccb962fbb25bae18d7978f6e"
},
{
"url": "https://git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64"
},
{
"url": "https://git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632"
}
],
"title": "btrfs: fix memory leak in btrfs_do_encoded_write()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74722",
"datePublished": "2026-08-22T15:33:14.582Z",
"dateReserved": "2026-08-15T05:44:03.929Z",
"dateUpdated": "2026-08-22T15:33:14.582Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74722",
"date": "2026-10-16",
"epss": "0.00173",
"percentile": "0.06232"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T02:17:52.000Z",
"cve": "CVE-2026-74722",
"id": "msrc_CVE-2026-74722",
"initial_release_date": "2026-08-24T01:10:28.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "btrfs: fix memory leak in btrfs_do_encoded_write()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74722.json",
"version": "4"
},
"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",
"vendor": "Linux",
"versions": [
{
"lessThan": "0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
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"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "24a8f2c29aebb753ccb962fbb25bae18d7978f6e",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "60b50ceba6243802f8d2c0a9a7c2d549a93b1d64",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
},
{
"lessThan": "d2a4e4e626b2f4670b69b430c357f03f53eb6632",
"status": "affected",
"version": "7c0c7269f7b508ba6e4b063a9314d6bd1fb6db22",
"versionType": "git"
}
]
},
{
"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": "5.18"
},
{
"lessThan": "5.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory leak in btrfs_do_encoded_write()\n\nLocal fuzzing of 6.12.94 has found the following memory leak:\n\nUnreferenced object 0xffff888018050a80 (size 64):\n comm \"syz.0.17\", pid 10297, jiffies 4294953601\n hex dump (first 32 bytes):\n 00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................\n 10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................\n backtrace (crc a8a6fc29):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUnreferenced object 0xffff888018050a00 (size 64):\n comm \"syz.0.17\", pid 10297, jiffies 4294953601\n hex dump (first 32 bytes):\n 00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................\n 90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................\n backtrace (crc cb5c9580):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n kzalloc_noprof include/linux/slab.h:1014 [inline]\n ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by freeing an extent changeset before returning from\nbtrfs_do_encoded_write()."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: corregir fuga de memoria en btrfs_do_encoded_write()\n\nEl fuzzing local de 6.12.94 ha encontrado la siguiente fuga de memoria:\n\nObjeto sin referencia 0xffff888018050a80 (tama\u00f1o 64):\n comm \u0027syz.0.17\u0027, pid 10297, jiffies 4294953601\n volcado hexadecimal (primeros 32 bytes):\n 00 10 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................\n 10 0a 05 18 80 88 ff ff 10 0a 05 18 80 88 ff ff ................\n rastreo (crc a8a6fc29):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n extent_changeset_alloc fs/btrfs/extent_io.h:207 [inline]\n qgroup_reserve_data+0x1c5/0x7d0 fs/btrfs/qgroup.c:4305\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nObjeto sin referencia 0xffff888018050a00 (tama\u00f1o 64):\n comm \u0027syz.0.17\u0027, pid 10297, jiffies 4294953601\n volcado hexadecimal (primeros 32 bytes):\n 00 00 00 00 00 00 00 00 ff 0f 00 00 00 00 00 00 ................\n 90 0a 05 18 80 88 ff ff 90 0a 05 18 80 88 ff ff ................\n rastreo (crc cb5c9580):\n kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]\n slab_post_alloc_hook mm/slub.c:4152 [inline]\n slab_alloc_node mm/slub.c:4197 [inline]\n __kmalloc_cache_noprof+0x168/0x2c0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:878 [inline]\n kzalloc_noprof include/linux/slab.h:1014 [inline]\n ulist_prealloc+0x9c/0x110 fs/btrfs/ulist.c:114\n extent_changeset_prealloc fs/btrfs/extent_io.h:217 [inline]\n __set_extent_bit+0x16b/0x1a70 fs/btrfs/extent-io-tree.c:1086\n set_record_extent_bits+0x50/0x90 fs/btrfs/extent-io-tree.c:1821\n qgroup_reserve_data+0x274/0x7d0 fs/btrfs/qgroup.c:4312\n btrfs_qgroup_reserve_data+0x2e/0xb0 fs/btrfs/qgroup.c:4355\n btrfs_do_encoded_write+0x92e/0x1040 fs/btrfs/inode.c:9746\n btrfs_encoded_write fs/btrfs/file.c:1482 [inline]\n btrfs_do_write_iter+0x280/0x610 fs/btrfs/file.c:1507\n btrfs_ioctl_encoded_write+0x3d6/0x490 fs/btrfs/ioctl.c:4738\n btrfs_ioctl+0x6f9/0xc90 fs/btrfs/ioctl.c:-1\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/common.c:47 [inline]\n do_syscall_64+0xbe/0x1a0 arch/x86/entry/common.c:78\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nCorregir esto liberando un extent changeset antes de regresar de btrfs_do_encoded_write()."
}
],
"id": "CVE-2026-74722",
"lastModified": "2026-10-14T13:10:00.187",
"metrics": {},
"published": "2026-08-22T16:16:47.183",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0f0da96ccb1b9f35f4d3d4540dcaab0969d9d6b0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/20c0eeb4313f9f89d47b80b672b5846f9827cb31"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/24a8f2c29aebb753ccb962fbb25bae18d7978f6e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/60b50ceba6243802f8d2c0a9a7c2d549a93b1d64"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d2a4e4e626b2f4670b69b430c357f03f53eb6632"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e2c7e88815edd5ecfb88e7660ab9fd42bda6bc47"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-25T10:02:45+00:00",
"cve": "CVE-2026-74722",
"id": "CVE-2026-74722",
"initial_release_date": "2026-08-22T00:00:00+00:00",
"product_status:known_affected": "90",
"product_status:known_not_affected": "184",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: btrfs: fix memory leak in btrfs_do_encoded_write()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74722.json",
"version": "3"
}
}
}
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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.
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- 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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Sightings and recorded dates, grouped by day · UTC
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.