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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": "2026-09-16",
      "epss": "0.00153",
      "percentile": "0.04845"
    },
    "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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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.


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.