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workqueue: Fix NULL current_pwq deref in flush dependency check

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix NULL current_pwq deref in flush dependency check check_flush_dependency() uses current_wq_worker() to determine whether the caller is a workqueue worker and then dereferences worker->current_pwq to test whether the current workqueue is WQ_MEM_RECLAIM. current_wq_worker() only means that %current has PF_WQ_WORKER set. A kworker can reach check_flush_dependency() while it is not executing a work item. One such path is worker_thread() acting as the pool manager, where create_worker() does GFP_KERNEL allocation and the allocation path invokes the OOM notifier. In that state worker->current_pwq is NULL because current_pwq is set only by process_one_work() and cleared again after the work function returns. [ 416.760634][ T375] Call trace: [ 416.760638][ T375] check_flush_dependency+0x80/0x120 (P) [ 416.760648][ T375] __flush_work+0x98/0x224 [ 416.760657][ T375] flush_work+0x30/0x44 [ 416.760665][ T375] ... [ 416.760710][ T375] blocking_notifier_call_chain+0x58/0xa0 [ 416.760719][ T375] out_of_memory+0xb4/0x458 [ 416.760730][ T375] __alloc_pages_may_oom+0x11c/0x1a8 [ 416.760739][ T375] __alloc_pages_slowpath+0x314/0x46c [ 416.760746][ T375] __alloc_frozen_pages_noprof+0x110/0x1a4 [ 416.760753][ T375] new_slab+0x12c/0x484 [ 416.760759][ T375] ___slab_alloc+0x7a8/0xc7c [ 416.760765][ T375] __slab_alloc+0x74/0xd8 [ 416.760772][ T375] __kmalloc_cache_node_noprof+0x2ac/0x304 [ 416.760779][ T375] alloc_work

Announced Source revision 1
Original source ↗

CVE-2026-98537

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98537

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "8ffececcb88262389b4f91fed0fe4884b68204bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "9bb739a5c5a570c28a62afb98e9326e2a49743c1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "cc190a6a1d20b87e6a9435202fc2a3bd84c79fb3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "513121e69388604619ea8c0ee07e86a3d1b5b5dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "0c6b9b1e295aeff1132ac7aa738148cc65f06485",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "1dccf5dc2f8fe688270b261ca4216e03c6a1e674",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "f97e6d0572d1b39998e053732332bc3cfdd0b9aa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fca839c00a12d682cb59b3b620d109a1d850b262",
        "lessThan": "db6365ced4d5855e321f772b240c0e473bcfcdd5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/workqueue.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/workqueue.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98537

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38562 · Revision 1
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Publisher date
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