{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-68168", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T13:41:40.250Z", "datePublished": "2025-12-16T13:42:48.350Z", "dateUpdated": "2026-08-05T12:09:57.842Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:57.842Z" }, "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 'non-static key' 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()." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "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->log == 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's behalf by udisks/automount for removable media or by an admin handling an untrusted image — 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->sb` (`JFS_SBI(tblk->sb)->log`) and `__wake_up_common()` walks an uninitialized list head, so the kernel reads through pointers taken from recycled vmalloc pages — an unbounded wild read of arbitrary kernel memory, not a bounded NULL dereference.\nI:H - The same path writes through those uninitialized pointers (`--log->active`, `tblk->flag |= tblkGC_UNLOCKED`, `spin_lock_irq(&log->gclock)`) and performs an indirect call `curr->func(...)` 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 — 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) — and even in the benign case the zeroed `TxAnchor.freetid` permanently wedges every JFS transaction on the machine." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/jfs/jfs_txnmgr.c" ], "versions": [ { "version": "2a8807f9f511c64de0c7cc9900a1683e3d72a3e5", "lessThan": "d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64", "status": "affected", "versionType": "git" }, { "version": "5c094ca994824e038b6a97835ded4e5d1d808504", "lessThan": "8cae9cf23e0bd424ac904e753639a587543ce03a", "status": "affected", "versionType": "git" }, { "version": "2febd5f81e4bfba61d9f374dcca628aff374cc56", "lessThan": "a2aa97cde9857f881920635a2e3d3b11769619c5", "status": "affected", "versionType": "git" }, { "version": "aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c", "lessThan": "d2dd7ca05a11685c314e62802a55e8d67a90e974", "status": "affected", "versionType": "git" }, { "version": "95e2b352c03b0a86c5717ba1d24ea20969abcacc", "lessThan": "2a9575a372182ca075070b3cd77490dcf0c951e7", "status": "affected", "versionType": "git" }, { "version": "95e2b352c03b0a86c5717ba1d24ea20969abcacc", "lessThan": "cbf2f527ae4ca7c7dabce42e85e8deb58588a37e", "status": "affected", "versionType": "git" }, { "version": "95e2b352c03b0a86c5717ba1d24ea20969abcacc", "lessThan": "038861414ab383b41dd35abbf9ff0ef715592d53", "status": "affected", "versionType": "git" }, { "version": "95e2b352c03b0a86c5717ba1d24ea20969abcacc", "lessThan": "300b072df72694ea330c4c673c035253e07827b8", "status": "affected", "versionType": "git" }, { "version": "a88efca805bea93cea9187dfd00835aa7093bf1b", "status": "affected", "versionType": "git" }, { "version": "97c1f26e4d4af55e8584e4646dd5c5fa7baf62c7", "status": "affected", "versionType": "git" }, { "version": "b0ed8ed0428ee96092da6fefa5cfacbe4abed701", "status": "affected", "versionType": "git" }, { "version": "5.4.255", "lessThan": "5.4.302", "status": "affected", "versionType": "semver" }, { "version": "5.10.192", "lessThan": "5.10.247", "status": "affected", "versionType": "semver" }, { "version": "5.15.123", "lessThan": "5.15.197", "status": "affected", "versionType": "semver" }, { "version": "6.1.42", "lessThan": "6.1.159", "status": "affected", "versionType": "semver" }, { "version": "4.14.324", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.293", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "6.4.7", "lessThan": "6.5", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/jfs/jfs_txnmgr.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.302", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.197", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "5.4.255", "versionEndExcluding": "5.4.302" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.192", "versionEndExcluding": "5.10.247" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.123", "versionEndExcluding": "5.15.197" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.42", "versionEndExcluding": "6.1.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.58" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.324" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.293" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d6af7fce2e162ac68e85d3a11eb6ac8c35b24b64" }, { "url": "https://git.kernel.org/stable/c/8cae9cf23e0bd424ac904e753639a587543ce03a" }, { "url": "https://git.kernel.org/stable/c/a2aa97cde9857f881920635a2e3d3b11769619c5" }, { "url": "https://git.kernel.org/stable/c/d2dd7ca05a11685c314e62802a55e8d67a90e974" }, { "url": "https://git.kernel.org/stable/c/2a9575a372182ca075070b3cd77490dcf0c951e7" }, { "url": "https://git.kernel.org/stable/c/cbf2f527ae4ca7c7dabce42e85e8deb58588a37e" }, { "url": "https://git.kernel.org/stable/c/038861414ab383b41dd35abbf9ff0ef715592d53" }, { "url": "https://git.kernel.org/stable/c/300b072df72694ea330c4c673c035253e07827b8" } ], "title": "jfs: fix uninitialized waitqueue in transaction manager", "x_generator": { "engine": "bippy-1.2.0" } } } }