{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-21983", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.799Z", "datePublished": "2025-04-01T15:47:10.949Z", "dateUpdated": "2026-05-11T21:10:22.288Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:10:22.288Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq\n\nCurrently kvfree_rcu() APIs use a system workqueue which is\n\"system_unbound_wq\" to driver RCU machinery to reclaim a memory.\n\nRecently, it has been noted that the following kernel warning can\nbe observed:\n\n\nworkqueue: WQ_MEM_RECLAIM nvme-wq:nvme_scan_work is flushing !WQ_MEM_RECLAIM events_unbound:kfree_rcu_work\n WARNING: CPU: 21 PID: 330 at kernel/workqueue.c:3719 check_flush_dependency+0x112/0x120\n Modules linked in: intel_uncore_frequency(E) intel_uncore_frequency_common(E) skx_edac(E) ...\n CPU: 21 UID: 0 PID: 330 Comm: kworker/u144:6 Tainted: G E 6.13.2-0_g925d379822da #1\n Hardware name: Wiwynn Twin Lakes MP/Twin Lakes Passive MP, BIOS YMM20 02/01/2023\n Workqueue: nvme-wq nvme_scan_work\n RIP: 0010:check_flush_dependency+0x112/0x120\n Code: 05 9a 40 14 02 01 48 81 c6 c0 00 00 00 48 8b 50 18 48 81 c7 c0 00 00 00 48 89 f9 48 ...\n RSP: 0018:ffffc90000df7bd8 EFLAGS: 00010082\n RAX: 000000000000006a RBX: ffffffff81622390 RCX: 0000000000000027\n RDX: 00000000fffeffff RSI: 000000000057ffa8 RDI: ffff88907f960c88\n RBP: 0000000000000000 R08: ffffffff83068e50 R09: 000000000002fffd\n R10: 0000000000000004 R11: 0000000000000000 R12: ffff8881001a4400\n R13: 0000000000000000 R14: ffff88907f420fb8 R15: 0000000000000000\n FS: 0000000000000000(0000) GS:ffff88907f940000(0000) knlGS:0000000000000000\n CR2: 00007f60c3001000 CR3: 000000107d010005 CR4: 00000000007726f0\n PKRU: 55555554\n Call Trace:\n \n ? __warn+0xa4/0x140\n ? check_flush_dependency+0x112/0x120\n ? report_bug+0xe1/0x140\n ? check_flush_dependency+0x112/0x120\n ? handle_bug+0x5e/0x90\n ? exc_invalid_op+0x16/0x40\n ? asm_exc_invalid_op+0x16/0x20\n ? timer_recalc_next_expiry+0x190/0x190\n ? check_flush_dependency+0x112/0x120\n ? check_flush_dependency+0x112/0x120\n __flush_work.llvm.1643880146586177030+0x174/0x2c0\n flush_rcu_work+0x28/0x30\n kvfree_rcu_barrier+0x12f/0x160\n kmem_cache_destroy+0x18/0x120\n bioset_exit+0x10c/0x150\n disk_release.llvm.6740012984264378178+0x61/0xd0\n device_release+0x4f/0x90\n kobject_put+0x95/0x180\n nvme_put_ns+0x23/0xc0\n nvme_remove_invalid_namespaces+0xb3/0xd0\n nvme_scan_work+0x342/0x490\n process_scheduled_works+0x1a2/0x370\n worker_thread+0x2ff/0x390\n ? pwq_release_workfn+0x1e0/0x1e0\n kthread+0xb1/0xe0\n ? __kthread_parkme+0x70/0x70\n ret_from_fork+0x30/0x40\n ? __kthread_parkme+0x70/0x70\n ret_from_fork_asm+0x11/0x20\n \n ---[ end trace 0000000000000000 ]---\n\n\nTo address this switch to use of independent WQ_MEM_RECLAIM\nworkqueue, so the rules are not violated from workqueue framework\npoint of view.\n\nApart of that, since kvfree_rcu() does reclaim memory it is worth\nto go with WQ_MEM_RECLAIM type of wq because it is designed for\nthis purpose." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slab_common.c" ], "versions": [ { "version": "6c6c47b063b593785202be158e61fe5c827d6677", "lessThan": "a74979dce9e9c61f6d797c3761020252c4d8dc63", "status": "affected", "versionType": "git" }, { "version": "6c6c47b063b593785202be158e61fe5c827d6677", "lessThan": "656e35bf66a11e1adde44c4c12050086dc39f241", "status": "affected", "versionType": "git" }, { "version": "6c6c47b063b593785202be158e61fe5c827d6677", "lessThan": "dfd3df31c9db752234d7d2e09bef2aeabb643ce4", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slab_common.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.20", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.8", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14", "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": "6.12", "versionEndExcluding": "6.12.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.13.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.14" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a74979dce9e9c61f6d797c3761020252c4d8dc63" }, { "url": "https://git.kernel.org/stable/c/656e35bf66a11e1adde44c4c12050086dc39f241" }, { "url": "https://git.kernel.org/stable/c/dfd3df31c9db752234d7d2e09bef2aeabb643ce4" } ], "title": "mm/slab/kvfree_rcu: Switch to WQ_MEM_RECLAIM wq", "x_generator": { "engine": "bippy-1.2.0" } } } }