FKIE_CVE-2026-98832

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: save IRQ state in blkg_tryget_closest() bio_set_dev() associates the bio with a blkg through bio_associate_blkg(). If the blkg lookup misses, blkg_tryget_closest() takes q->queue_lock with spin_lock_irq() and releases it with spin_unlock_irq(), which unconditionally enables local interrupts. Callers may call bio_set_dev() with interrupts already disabled, e.g. dm-thin's pool_map() does so while holding pool->lock taken with spin_lock_irq(). The nested spin_unlock_irq() then enables interrupts while pool->lock is still held, so an I/O completion softirq can run on the same CPU, re-acquire pool->lock (thin_endio(), or overwrite_endio() -> complete_mapping_preparation()) and deadlock. lockdep reports this as inconsistent SOFTIRQ-ON-W to IN-SOFTIRQ-W usage. Commit 3a762de55b4e ("block: save irq state in blkg_lookup_create()") fixed the same problem while the lock lived in blkg_lookup_create(), but commit 9327a865e395 ("blk-cgroup: don't nest queue_lock under rcu in blkg_lookup_create()") moved the locking into blkg_tryget_closest() and reverted it to spin_lock_irq(). Save and restore the caller's IRQ state instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/327c428ba79b13e4cc5253333a9d5c0aa5579bdf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9fcf4317384ce6758c3127a6e8914c54cbb9c8cc
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9fcf4317384ce6758c3127a6e8914c54cbb9c8cc",
              "status": "affected",
              "version": "9327a865e395a53f67dffac4710beb1d4730495e",
              "versionType": "git"
            },
            {
              "lessThan": "327c428ba79b13e4cc5253333a9d5c0aa5579bdf",
              "status": "affected",
              "version": "9327a865e395a53f67dffac4710beb1d4730495e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "lessThan": "7.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: save IRQ state in blkg_tryget_closest()\n\nbio_set_dev() associates the bio with a blkg through bio_associate_blkg().\nIf the blkg lookup misses, blkg_tryget_closest() takes q-\u003equeue_lock with\nspin_lock_irq() and releases it with spin_unlock_irq(), which\nunconditionally enables local interrupts.\n\nCallers may call bio_set_dev() with interrupts already disabled, e.g.\ndm-thin\u0027s pool_map() does so while holding pool-\u003elock taken with\nspin_lock_irq().  The nested spin_unlock_irq() then enables interrupts\nwhile pool-\u003elock is still held, so an I/O completion softirq can run on\nthe same CPU, re-acquire pool-\u003elock (thin_endio(), or overwrite_endio()\n-\u003e complete_mapping_preparation()) and deadlock.  lockdep reports this\nas inconsistent SOFTIRQ-ON-W to IN-SOFTIRQ-W usage.\n\nCommit 3a762de55b4e (\"block: save irq state in blkg_lookup_create()\")\nfixed the same problem while the lock lived in blkg_lookup_create(), but\ncommit 9327a865e395 (\"blk-cgroup: don\u0027t nest queue_lock under rcu in\nblkg_lookup_create()\") moved the locking into blkg_tryget_closest() and\nreverted it to spin_lock_irq().\n\nSave and restore the caller\u0027s IRQ state instead."
    }
  ],
  "id": "CVE-2026-98832",
  "lastModified": "2026-10-19T10:19:47.233",
  "metrics": {},
  "published": "2026-10-18T16:17:37.443",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/327c428ba79b13e4cc5253333a9d5c0aa5579bdf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9fcf4317384ce6758c3127a6e8914c54cbb9c8cc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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