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vuln-cve/data/2026/64xxx/CVE-2026-64359.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-64359",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-07-19T15:36:31.782Z",
"datePublished": "2026-07-25T08:50:15.947Z",
"dateUpdated": "2026-08-17T04:54:05.599Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-17T04:54:05.599Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers\n\nSyzbot reported a hung task in nilfs_transaction_begin() where multiple\ntasks performing chmod() on a nilfs2 mount blocked for over 143 seconds\nwaiting to acquire ns_segctor_sem for read:\n\n INFO: task syz.0.17:5918 blocked for more than 143 seconds.\n Call Trace:\n schedule+0x164/0x360\n rwsem_down_read_slowpath+0x6d9/0x940\n down_read+0x99/0x2e0\n nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221\n nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921\n notify_change+0xc1a/0xf40\n chmod_common+0x273/0x4a0\n do_fchmodat+0x12d/0x230\n\nThe writer holding ns_segctor_sem was a concurrent\nNILFS_IOCTL_CLEAN_SEGMENTS caller, stuck inside printk while emitting\nper-element warnings from nilfs_sufile_updatev():\n\n __nilfs_msg+0x373/0x450 fs/nilfs2/super.c:78\n nilfs_sufile_updatev+0x21c/0x6d0 fs/nilfs2/sufile.c:186\n nilfs_sufile_freev fs/nilfs2/sufile.h:93 [inline]\n nilfs_free_segments fs/nilfs2/segment.c:1140 [inline]\n nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1261 [inline]\n nilfs_segctor_do_construct+0x1f55/0x76c0\n nilfs_clean_segments+0x3bd/0xa50\n nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline]\n nilfs_ioctl+0x261f/0x2780\n\nThe root cause is that user-supplied segment numbers are not validated\nbefore nilfs_clean_segments() begins doing work; the range check on\neach segnum is performed deep inside the call chain by\nnilfs_sufile_updatev(), which emits a nilfs_warn() per invalid entry\nwhile still holding the segctor lock and the sufile mi_sem. Under load\n(repeated invocations across multiple mounts saturating the global\nprintk path), the cumulative printk latency keeps ns_segctor_sem held\nlong enough to trip the hung_task watchdog, blocking concurrent\noperations such as chmod() that need ns_segctor_sem for read.\n\nFix by validating the contents of kbufs[4] in nilfs_clean_segments()\nimmediately after acquiring ns_segctor_sem via nilfs_transaction_lock().\nHolding ns_segctor_sem serializes the check against\nnilfs_ioctl_resize(), which can modify ns_nsegments, so the validation\nuses a consistent value. Out-of-range segment numbers are rejected\nwith -EINVAL before any segment-cleaning work begins, so the bad\nentries never reach the per-element diagnostic path inside\nnilfs_sufile_updatev()."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/nilfs2/segment.c"
],
"versions": [
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "876c98e0fc65f071680c03c2e2ee3ef7ff9ca078",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "39607452b1400c7bf748f15122df4d058b768c5b",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "286f77d002a337735c0846d7480a82d9cda2aa31",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "223463c488b0554212a94de971ea538eb2805fc7",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "d26aef771b4f6923da9f89d6d5b70d8def5853de",
"status": "affected",
"versionType": "git"
},
{
"version": "071cb4b81987a28c7ac2702003cff3e61684a630",
"lessThan": "0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/nilfs2/segment.c"
],
"versions": [
{
"version": "2.6.31",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.31",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.261",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.212",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.178",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.145",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.96",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.39",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.4",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "5.10.261"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "5.15.212"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "6.1.178"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "6.6.145"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "6.12.96"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "6.18.39"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "7.1.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.31",
"versionEndExcluding": "7.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e"
},
{
"url": "https://git.kernel.org/stable/c/876c98e0fc65f071680c03c2e2ee3ef7ff9ca078"
},
{
"url": "https://git.kernel.org/stable/c/39607452b1400c7bf748f15122df4d058b768c5b"
},
{
"url": "https://git.kernel.org/stable/c/286f77d002a337735c0846d7480a82d9cda2aa31"
},
{
"url": "https://git.kernel.org/stable/c/0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa"
},
{
"url": "https://git.kernel.org/stable/c/223463c488b0554212a94de971ea538eb2805fc7"
},
{
"url": "https://git.kernel.org/stable/c/d26aef771b4f6923da9f89d6d5b70d8def5853de"
},
{
"url": "https://git.kernel.org/stable/c/0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9"
}
],
"title": "nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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