{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98537", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.355Z", "datePublished": "2026-10-18T15:18:05.028Z", "dateUpdated": "2026-10-19T09:21:20.715Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:21:20.715Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix NULL current_pwq deref in flush dependency check\n\ncheck_flush_dependency() uses current_wq_worker() to determine whether\nthe caller is a workqueue worker and then dereferences worker->current_pwq\nto test whether the current workqueue is WQ_MEM_RECLAIM.\n\ncurrent_wq_worker() only means that %current has PF_WQ_WORKER set. A\nkworker can reach check_flush_dependency() while it is not executing a\nwork item. One such path is worker_thread() acting as the pool manager,\nwhere create_worker() does GFP_KERNEL allocation and the allocation path\ninvokes the OOM notifier. In that state worker->current_pwq is NULL\nbecause current_pwq is set only by process_one_work() and cleared again\nafter the work function returns.\n\n[ 416.760634][ T375] Call trace:\n[ 416.760638][ T375] check_flush_dependency+0x80/0x120 (P)\n[ 416.760648][ T375] __flush_work+0x98/0x224\n[ 416.760657][ T375] flush_work+0x30/0x44\n[ 416.760665][ T375] ...\n[ 416.760710][ T375] blocking_notifier_call_chain+0x58/0xa0\n[ 416.760719][ T375] out_of_memory+0xb4/0x458\n[ 416.760730][ T375] __alloc_pages_may_oom+0x11c/0x1a8\n[ 416.760739][ T375] __alloc_pages_slowpath+0x314/0x46c\n[ 416.760746][ T375] __alloc_frozen_pages_noprof+0x110/0x1a4\n[ 416.760753][ T375] new_slab+0x12c/0x484\n[ 416.760759][ T375] ___slab_alloc+0x7a8/0xc7c\n[ 416.760765][ T375] __slab_alloc+0x74/0xd8\n[ 416.760772][ T375] __kmalloc_cache_node_noprof+0x2ac/0x304\n[ 416.760779][ T375] alloc_worker+0x28/0x60\n[ 416.760785][ T375] create_worker+0x4c/0x20c\n[ 416.760790][ T375] worker_thread+0xe8/0x2b8\n[ 416.760796][ T375] kthread+0x1a8/0x200\n[ 416.760805][ T375] ret_from_fork+0x10/0x20\n\nGuard the WQ_MEM_RECLAIM-worker warning with worker->current_pwq. If the\nkworker is not currently executing a work item, there is no current\nworkqueue to diagnose with that warning. The PF_MEMALLOC warning is left\nunchanged so explicit reclaim context flushing a !WQ_MEM_RECLAIM target\nis still reported." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/workqueue.c" ], "versions": [ { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "8ffececcb88262389b4f91fed0fe4884b68204bc", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "9bb739a5c5a570c28a62afb98e9326e2a49743c1", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "cc190a6a1d20b87e6a9435202fc2a3bd84c79fb3", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "513121e69388604619ea8c0ee07e86a3d1b5b5dc", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "0c6b9b1e295aeff1132ac7aa738148cc65f06485", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "1dccf5dc2f8fe688270b261ca4216e03c6a1e674", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "f97e6d0572d1b39998e053732332bc3cfdd0b9aa", "status": "affected", "versionType": "git" }, { "version": "fca839c00a12d682cb59b3b620d109a1d850b262", "lessThan": "db6365ced4d5855e321f772b240c0e473bcfcdd5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/workqueue.c" ], "versions": [ { "version": "4.5", "status": "affected" }, { "version": "0", "lessThan": "4.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "4.5", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8ffececcb88262389b4f91fed0fe4884b68204bc" }, { "url": "https://git.kernel.org/stable/c/9bb739a5c5a570c28a62afb98e9326e2a49743c1" }, { "url": "https://git.kernel.org/stable/c/cc190a6a1d20b87e6a9435202fc2a3bd84c79fb3" }, { "url": "https://git.kernel.org/stable/c/513121e69388604619ea8c0ee07e86a3d1b5b5dc" }, { "url": "https://git.kernel.org/stable/c/0c6b9b1e295aeff1132ac7aa738148cc65f06485" }, { "url": "https://git.kernel.org/stable/c/1dccf5dc2f8fe688270b261ca4216e03c6a1e674" }, { "url": "https://git.kernel.org/stable/c/f97e6d0572d1b39998e053732332bc3cfdd0b9aa" }, { "url": "https://git.kernel.org/stable/c/db6365ced4d5855e321f772b240c0e473bcfcdd5" } ], "title": "workqueue: Fix NULL current_pwq deref in flush dependency check", "x_generator": { "engine": "bippy-1.2.0" } } } }