CVE-2022-49995 (GCVE-0-2022-49995)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2025-06-18 11:00
VLAI?
Title
writeback: avoid use-after-free after removing device
Summary
In the Linux kernel, the following vulnerability has been resolved: writeback: avoid use-after-free after removing device When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback. Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work. Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 45a2966fd64147518dc5bca25f447bd0fb5359ac , < f96b9f7c1676923bce871e728bb49c0dfa5013cc (git)
Affected: 45a2966fd64147518dc5bca25f447bd0fb5359ac , < 9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7 (git)
Affected: 45a2966fd64147518dc5bca25f447bd0fb5359ac , < f87904c075515f3e1d8f4a7115869d3b914674fd (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.64 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fs-writeback.c",
            "mm/backing-dev.c",
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          "versions": [
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwriteback: avoid use-after-free after removing device\n\nWhen a disk is removed, bdi_unregister gets called to stop further\nwriteback and wait for associated delayed work to complete.  However,\nwb_inode_writeback_end() may schedule bandwidth estimation dwork after\nthis has completed, which can result in the timer attempting to access the\njust freed bdi_writeback.\n\nFix this by checking if the bdi_writeback is alive, similar to when\nscheduling writeback work.\n\nSince this requires wb-\u003ework_lock, and wb_inode_writeback_end() may get\ncalled from interrupt, switch wb-\u003ework_lock to an irqsafe lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:00:55.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/f87904c075515f3e1d8f4a7115869d3b914674fd"
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      ],
      "title": "writeback: avoid use-after-free after removing device",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49995",
    "datePublished": "2025-06-18T11:00:55.352Z",
    "dateReserved": "2025-06-18T10:57:27.387Z",
    "dateUpdated": "2025-06-18T11:00:55.352Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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