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CVE-2025-68168 (GCVE-0-2025-68168)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:42 – Updated: 2026-08-05 12:09
VLAI
Title
jfs: fix uninitialized waitqueue in transaction manager
Summary
In the Linux kernel, the following vulnerability has been resolved: jfs: fix uninitialized waitqueue in transaction manager The transaction manager initialization in txInit() was not properly initializing TxBlock[0].waitor waitqueue, causing a crash when txEnd(0) is called on read-only filesystems. When a filesystem is mounted read-only, txBegin() returns tid=0 to indicate no transaction. However, txEnd(0) still gets called and tries to access TxBlock[0].waitor via tid_to_tblock(0), but this waitqueue was never initialized because the initialization loop started at index 1 instead of 0. This causes a 'non-static key' lockdep warning and system crash: INFO: trying to register non-static key in txEnd Fix by ensuring all transaction blocks including TxBlock[0] have their waitqueues properly initialized during txInit().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2a8807f9f511c64de0c7cc9900a1683e3d72a3e5 , < d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64 (git)
Affected: 5c094ca994824e038b6a97835ded4e5d1d808504 , < 8cae9cf23e0bd424ac904e753639a587543ce03a (git)
Affected: 2febd5f81e4bfba61d9f374dcca628aff374cc56 , < a2aa97cde9857f881920635a2e3d3b11769619c5 (git)
Affected: aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c , < d2dd7ca05a11685c314e62802a55e8d67a90e974 (git)
Affected: 95e2b352c03b0a86c5717ba1d24ea20969abcacc , < 2a9575a372182ca075070b3cd77490dcf0c951e7 (git)
Affected: 95e2b352c03b0a86c5717ba1d24ea20969abcacc , < cbf2f527ae4ca7c7dabce42e85e8deb58588a37e (git)
Affected: 95e2b352c03b0a86c5717ba1d24ea20969abcacc , < 038861414ab383b41dd35abbf9ff0ef715592d53 (git)
Affected: 95e2b352c03b0a86c5717ba1d24ea20969abcacc , < 300b072df72694ea330c4c673c035253e07827b8 (git)
Affected: a88efca805bea93cea9187dfd00835aa7093bf1b (git)
Affected: 97c1f26e4d4af55e8584e4646dd5c5fa7baf62c7 (git)
Affected: b0ed8ed0428ee96092da6fefa5cfacbe4abed701 (git)
Affected: 5.4.255 , < 5.4.302 (semver)
Affected: 5.10.192 , < 5.10.247 (semver)
Affected: 5.15.123 , < 5.15.197 (semver)
Affected: 6.1.42 , < 6.1.159 (semver)
Affected: 4.14.324 , < 4.15 (semver)
Affected: 4.19.293 , < 4.20 (semver)
Affected: 6.4.7 , < 6.5 (semver)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: fix uninitialized waitqueue in transaction manager\n\nThe transaction manager initialization in txInit() was not properly\ninitializing TxBlock[0].waitor waitqueue, causing a crash when\ntxEnd(0) is called on read-only filesystems.\n\nWhen a filesystem is mounted read-only, txBegin() returns tid=0 to\nindicate no transaction. However, txEnd(0) still gets called and\ntries to access TxBlock[0].waitor via tid_to_tblock(0), but this\nwaitqueue was never initialized because the initialization loop\nstarted at index 1 instead of 0.\n\nThis causes a \u0027non-static key\u0027 lockdep warning and system crash:\n  INFO: trying to register non-static key in txEnd\n\nFix by ensuring all transaction blocks including TxBlock[0] have\ntheir waitqueues properly initialized during txInit()."
        }
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              "value": "AV:L - The vulnerable code is reached only through local filesystem operations on a mounted JFS volume (mount/remount plus ordinary syscalls such as creat/unlink/close); no remote peer data is parsed anywhere on the path.\nAC:L - Once a JFS volume has `sbi-\u003elog == NULL` (plain `mount -o ro`, remount-ro, or a failed `remount,rw` that still clears SB_RDONLY), `txBegin()` deterministically returns tid 0 and the very next `txEnd(0)` hits the uninitialized `TxBlock[0]`; there is no race to win and no memory layout the attacker must guess.\nPR:L - The trigger is an ordinary unprivileged file operation on an already-mounted volume, and the mount itself is routinely performed on the attacker\u0027s behalf by udisks/automount for removable media or by an admin handling an untrusted image \u2014 the standard crafted-filesystem-image model used for comparable fs CVEs.\nUI:N - After the volume is mounted as part of normal system operation, the attacker performs the triggering syscall entirely on their own; no victim action is needed at exploitation time.\nS:U - The corruption is confined to kernel memory within the same kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `txEnd(0)` dereferences the uninitialized `tblk-\u003esb` (`JFS_SBI(tblk-\u003esb)-\u003elog`) and `__wake_up_common()` walks an uninitialized list head, so the kernel reads through pointers taken from recycled vmalloc pages \u2014 an unbounded wild read of arbitrary kernel memory, not a bounded NULL dereference.\nI:H - The same path writes through those uninitialized pointers (`--log-\u003eactive`, `tblk-\u003eflag |= tblkGC_UNLOCKED`, `spin_lock_irq(\u0026log-\u003egclock)`) and performs an indirect call `curr-\u003efunc(...)` through an uninitialized function pointer, giving both a write and a control-flow-hijack primitive; it additionally corrupts global JFS state by setting `TxAnchor.freetid = 0`.\nA:H - Real-world outcome is a hard kernel failure \u2014 lockdep \"non-static key\" BUG, wild-pointer oops, or an endless spin on a garbage spinlock with the global `jfsTxnLock` held and IRQs disabled (hard lockup) \u2014 and even in the benign case the zeroed `TxAnchor.freetid` permanently wedges every JFS transaction on the machine."
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        "dateUpdated": "2026-08-05T12:09:57.842Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/300b072df72694ea330c4c673c035253e07827b8"
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      ],
      "title": "jfs: fix uninitialized waitqueue in transaction manager",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68168",
    "datePublished": "2025-12-16T13:42:48.350Z",
    "dateReserved": "2025-12-16T13:41:40.250Z",
    "dateUpdated": "2026-08-05T12:09:57.842Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-68168",
      "date": "2026-09-15",
      "epss": "0.00153",
      "percentile": "0.04815"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68168\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:48.647\",\"lastModified\":\"2026-07-30T06:24:31.683\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\njfs: fix uninitialized waitqueue in transaction manager\\n\\nThe transaction manager initialization in txInit() was not properly\\ninitializing TxBlock[0].waitor waitqueue, causing a crash when\\ntxEnd(0) is called on read-only filesystems.\\n\\nWhen a filesystem is mounted read-only, txBegin() returns tid=0 to\\nindicate no transaction. However, txEnd(0) still gets called and\\ntries to access TxBlock[0].waitor via tid_to_tblock(0), but this\\nwaitqueue was never initialized because the initialization loop\\nstarted at index 1 instead of 0.\\n\\nThis causes a \u0027non-static key\u0027 lockdep warning and system crash:\\n  INFO: trying to register non-static key in txEnd\\n\\nFix by ensuring all transaction blocks including TxBlock[0] have\\ntheir waitqueues properly initialized during txInit().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/jfs/jfs_txnmgr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2a8807f9f511c64de0c7cc9900a1683e3d72a3e5\",\"lessThan\":\"d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c094ca994824e038b6a97835ded4e5d1d808504\",\"lessThan\":\"8cae9cf23e0bd424ac904e753639a587543ce03a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2febd5f81e4bfba61d9f374dcca628aff374cc56\",\"lessThan\":\"a2aa97cde9857f881920635a2e3d3b11769619c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c\",\"lessThan\":\"d2dd7ca05a11685c314e62802a55e8d67a90e974\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"95e2b352c03b0a86c5717ba1d24ea20969abcacc\",\"lessThan\":\"2a9575a372182ca075070b3cd77490dcf0c951e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"95e2b352c03b0a86c5717ba1d24ea20969abcacc\",\"lessThan\":\"cbf2f527ae4ca7c7dabce42e85e8deb58588a37e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"95e2b352c03b0a86c5717ba1d24ea20969abcacc\",\"lessThan\":\"038861414ab383b41dd35abbf9ff0ef715592d53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"95e2b352c03b0a86c5717ba1d24ea20969abcacc\",\"lessThan\":\"300b072df72694ea330c4c673c035253e07827b8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a88efca805bea93cea9187dfd00835aa7093bf1b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"97c1f26e4d4af55e8584e4646dd5c5fa7baf62c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b0ed8ed0428ee96092da6fefa5cfacbe4abed701\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.255\",\"lessThan\":\"5.4.302\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.10.192\",\"lessThan\":\"5.10.247\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.123\",\"lessThan\":\"5.15.197\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.42\",\"lessThan\":\"6.1.159\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.14.324\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.293\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.4.7\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/jfs/jfs_txnmgr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.302\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.247\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.197\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.159\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.117\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.58\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17.8\",\"lessThanOrEqual\":\"6.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/038861414ab383b41dd35abbf9ff0ef715592d53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a9575a372182ca075070b3cd77490dcf0c951e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/300b072df72694ea330c4c673c035253e07827b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cae9cf23e0bd424ac904e753639a587543ce03a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2aa97cde9857f881920635a2e3d3b11769619c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbf2f527ae4ca7c7dabce42e85e8deb58588a37e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2dd7ca05a11685c314e62802a55e8d67a90e974\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:37:40+00:00",
      "cve": "CVE-2025-68168",
      "id": "CVE-2025-68168",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: jfs: fix uninitialized waitqueue in transaction manager",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68168.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:11:42Z",
      "cve": "CVE-2025-68168",
      "id": "CVE-2025-68168",
      "initial_release_date": "2025-12-17T00:26:26Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "457",
      "product_status:recommended": "212",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68168",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68168.json",
      "version": "29"
    }
  }
}



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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.