FKIE_CVE-2026-97619

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: end write accounting from ->ki_complete Commit b000145e9907 moved both the fsnotify calls and the write accounting out of the kiocb completion handler and into the io_req_rw_complete() task_work. However, only the fsnotify part actually needed to move as it may sleep. Ending the write accounting is just a percpu_up_read() on the superblock writers sem. Deferring it is a problem, because it makes dropping SB_FREEZE_WRITE protection depend on the ring owner getting to running task_work. But the task may be blocked in freeze_super(), causing it to never get to that: task io-wq worker -------------------------------------------------------------- io_write() io_kiocb_start_write() (takes sb_writers, hidden from lockdep by __sb_writers_release) write_iter() -> -EIOCBQUEUED ioctl(FS_IOC_SHUTDOWN) bdev_freeze() freeze_super() percpu_down_write() <- waits for the reader above io_write() kiocb_start_write() percpu_down_read() <- queued behind the writer <bio completes> io_complete_rw() queues io_req_rw_complete() <- never runs, task is in D state End the write from io_complete_rw() instead, and leave only the fsnotify calls in task_work.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/055d43a1233edbd80e558889258105ce63051bcd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/796aa0547557e63338657ed1c487906f9fac4c73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc580cee4dfa2ec9099c30ecbd4d804cbb996432
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cc580cee4dfa2ec9099c30ecbd4d804cbb996432",
              "status": "affected",
              "version": "b000145e9907809406d8164c3b2b8861d95aecd1",
              "versionType": "git"
            },
            {
              "lessThan": "055d43a1233edbd80e558889258105ce63051bcd",
              "status": "affected",
              "version": "b000145e9907809406d8164c3b2b8861d95aecd1",
              "versionType": "git"
            },
            {
              "lessThan": "796aa0547557e63338657ed1c487906f9fac4c73",
              "status": "affected",
              "version": "b000145e9907809406d8164c3b2b8861d95aecd1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ea2e6286e3e89a115ae554e20ba9aec2b2e1ddff",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "89a410dbd0f159ddd308f19d6eb682fc753e4771",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2a853c206e553dd9c0a55c22858fd6a446d93e15",
              "versionType": "git"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.165",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.90",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1",
              "status": "affected",
              "version": "6.0.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "io_uring/rw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "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\nio_uring/rw: end write accounting from -\u003eki_complete\n\nCommit b000145e9907 moved both the fsnotify calls and the write\naccounting out of the kiocb completion handler and into the\nio_req_rw_complete() task_work. However, only the fsnotify part actually\nneeded to move as it may sleep. Ending the write accounting is just a\npercpu_up_read() on the superblock writers sem.\n\nDeferring it is a problem, because it makes dropping SB_FREEZE_WRITE\nprotection depend on the ring owner getting to running task_work. But\nthe task may be blocked in freeze_super(), causing it to never get to\nthat:\n\n  task                             io-wq worker\n  --------------------------------------------------------------\n  io_write()\n    io_kiocb_start_write()         (takes sb_writers, hidden from\n                                    lockdep by __sb_writers_release)\n    write_iter() -\u003e -EIOCBQUEUED\n  ioctl(FS_IOC_SHUTDOWN)\n    bdev_freeze()\n      freeze_super()\n        percpu_down_write()        \u003c- waits for the reader above\n                                   io_write()\n                                     kiocb_start_write()\n                                       percpu_down_read()  \u003c- queued\n                                                              behind the\n                                                              writer\n  \u003cbio completes\u003e\n    io_complete_rw()\n      queues io_req_rw_complete()  \u003c- never runs, task is in D state\n\nEnd the write from io_complete_rw() instead, and leave only the fsnotify\ncalls in task_work."
    }
  ],
  "id": "CVE-2026-97619",
  "lastModified": "2026-09-25T11:17:16.117",
  "metrics": {},
  "published": "2026-09-25T11:17:16.117",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/055d43a1233edbd80e558889258105ce63051bcd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/796aa0547557e63338657ed1c487906f9fac4c73"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cc580cee4dfa2ec9099c30ecbd4d804cbb996432"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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