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blk-mq: pop cached request if it is usable

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: blk-mq: pop cached request if it is usable When submitting a bio to blk-mq, if the task should sleep after peeking a cached request, but before it pops it, the plug flushes and calls blk_mq_free_plug_rqs, freeing the cached_rqs. This creates a use-after-free bug. Fix this by popping the cached request before any possible blocking calls if it is suitable for use. Popping this request first holds a queue reference, so avoid any serialization races with queue freezes and can safely proceed with dispatching that request to the driver. This potentially increases a timing window from when a driver wants to freeze its queue to when requests stop being dispatched. That scenario is off the fast path though, and drivers need to appropriately handle requests during a freeze request anyway. The downside is the popped element needs to be individually freed when we performed a bio plug merge. The cached request would have had to be freed later anyway, but this patch does it inline with building the plug list instead of after flushing it.

Announced Source revision 1
Original source ↗

CVE-2026-64017

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-2026-64017

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": "b0077e269f6c152e807fdac90b58caf012cdbaab",
        "lessThan": "23d8ea1e303b5f32d883757a4a707e791dbc9808",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b0077e269f6c152e807fdac90b58caf012cdbaab",
        "lessThan": "97e2d08de282ef76f84ab4ccd00f1acb3f5f999e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b0077e269f6c152e807fdac90b58caf012cdbaab",
        "lessThan": "388468f7e7d1eab092cf2a39fdfb502e52019ec6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b0077e269f6c152e807fdac90b58caf012cdbaab",
        "lessThan": "dc278e9bf2b9513a763353e6b9cc21e0f532954e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b5c8e0ff76d10f6bf70a7237678f27c20cf59bc9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e9c309ded295b7f8849097d71ae231456ca79f78",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b80056bd75a16e4550873ecefe12bc8fd190b1cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33cf52b6e53a6aa55883aa7fb9ceffceff8488a6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b6075046470c8756242dfe3fd058813636f69a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.1.72",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.5.13",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.3",
        "lessThan": "6.7",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.75",
        "lessThan": "6.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.14",
        "lessThan": "6.7",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "block/blk-mq.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "block/blk-mq.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64017

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40934 · Revision 1
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Publisher date
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