CVE-2026-64359 (GCVE-0-2026-64359)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50
VLAI
Title
nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers Syzbot reported a hung task in nilfs_transaction_begin() where multiple tasks performing chmod() on a nilfs2 mount blocked for over 143 seconds waiting to acquire ns_segctor_sem for read: INFO: task syz.0.17:5918 blocked for more than 143 seconds. Call Trace: schedule+0x164/0x360 rwsem_down_read_slowpath+0x6d9/0x940 down_read+0x99/0x2e0 nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221 nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921 notify_change+0xc1a/0xf40 chmod_common+0x273/0x4a0 do_fchmodat+0x12d/0x230 The writer holding ns_segctor_sem was a concurrent NILFS_IOCTL_CLEAN_SEGMENTS caller, stuck inside printk while emitting per-element warnings from nilfs_sufile_updatev(): __nilfs_msg+0x373/0x450 fs/nilfs2/super.c:78 nilfs_sufile_updatev+0x21c/0x6d0 fs/nilfs2/sufile.c:186 nilfs_sufile_freev fs/nilfs2/sufile.h:93 [inline] nilfs_free_segments fs/nilfs2/segment.c:1140 [inline] nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1261 [inline] nilfs_segctor_do_construct+0x1f55/0x76c0 nilfs_clean_segments+0x3bd/0xa50 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline] nilfs_ioctl+0x261f/0x2780 The root cause is that user-supplied segment numbers are not validated before nilfs_clean_segments() begins doing work; the range check on each segnum is performed deep inside the call chain by nilfs_sufile_updatev(), which emits a nilfs_warn() per invalid entry while still holding the segctor lock and the sufile mi_sem. Under load (repeated invocations across multiple mounts saturating the global printk path), the cumulative printk latency keeps ns_segctor_sem held long enough to trip the hung_task watchdog, blocking concurrent operations such as chmod() that need ns_segctor_sem for read. Fix by validating the contents of kbufs[4] in nilfs_clean_segments() immediately after acquiring ns_segctor_sem via nilfs_transaction_lock(). Holding ns_segctor_sem serializes the check against nilfs_ioctl_resize(), which can modify ns_nsegments, so the validation uses a consistent value. Out-of-range segment numbers are rejected with -EINVAL before any segment-cleaning work begins, so the bad entries never reach the per-element diagnostic path inside nilfs_sufile_updatev().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 876c98e0fc65f071680c03c2e2ee3ef7ff9ca078 (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 39607452b1400c7bf748f15122df4d058b768c5b (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 286f77d002a337735c0846d7480a82d9cda2aa31 (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 223463c488b0554212a94de971ea538eb2805fc7 (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < d26aef771b4f6923da9f89d6d5b70d8def5853de (git)
Affected: 071cb4b81987a28c7ac2702003cff3e61684a630 , < 0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9 (git)
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Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
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          "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()."
        }
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      "title": "nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64359",
    "datePublished": "2026-07-25T08:50:15.947Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
    "dateUpdated": "2026-07-25T08:50:15.947Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-64359",
      "date": "2026-07-26",
      "epss": "0.00177",
      "percentile": "0.07456"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-26T01:09:58.000Z",
      "cve": "CVE-2026-64359",
      "id": "msrc_CVE-2026-64359",
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      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64359.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64359\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:18.377\",\"lastModified\":\"2026-07-25T10:17:18.377\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nilfs2/segment.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"876c98e0fc65f071680c03c2e2ee3ef7ff9ca078\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"39607452b1400c7bf748f15122df4d058b768c5b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"286f77d002a337735c0846d7480a82d9cda2aa31\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"223463c488b0554212a94de971ea538eb2805fc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"d26aef771b4f6923da9f89d6d5b70d8def5853de\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"071cb4b81987a28c7ac2702003cff3e61684a630\",\"lessThan\":\"0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nilfs2/segment.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.31\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.31\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/223463c488b0554212a94de971ea538eb2805fc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/286f77d002a337735c0846d7480a82d9cda2aa31\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/39607452b1400c7bf748f15122df4d058b768c5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/876c98e0fc65f071680c03c2e2ee3ef7ff9ca078\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d26aef771b4f6923da9f89d6d5b70d8def5853de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:02Z",
      "cve": "CVE-2026-64359",
      "id": "CVE-2026-64359",
      "initial_release_date": "2026-07-25T16:01:02Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64359",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64359.json",
      "version": "2"
    }
  }
}



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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.