CVE-2026-90284 (GCVE-0-2026-90284)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
firmware_loader: do not queue completed sysfs fallback requests
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware_loader: do not queue completed sysfs fallback requests fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to pending_fw_head. device_add() publishes the fallback loading interface, so a userspace helper which discovers the device by scanning sysfs can write 0 to the loading attribute and complete the request before it is queued as pending. In that interleaving firmware_loading_store() calls fw_state_done() while pending_list still points to itself, so it cannot remove an entry from pending_fw_head. The subsequent unconditional list_add() then queues an already-completed fw_priv. Once the request is released, pending_fw_head can retain a pointer to freed memory and the next fallback request can fault while validating the list. Only in-flight fallback requests need suspend or reboot abort handling. If the request is already DONE after device_add(), return success from the fallback path without sending another uevent, waiting again, or queueing it as pending. This preserves the invariant that pending_fw_head contains only active fallback requests.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ecb739cf15a9bae040ce6b60209b78b92512d120 , < c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7 (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < 93a2385730540105df8524447dcc11309ad280f9 (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < ea33fac0df7fe7b49a4b27acb83e227b82317d1d (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < 5a250bff75a446374c05622973b18b4ab662b504 (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < 85aeb8fc61839098ae0942ccba86e669c08e75d4 (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < 6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7b (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < fb4824880b0dba0e7b3a497c46c642f979630392 (git)
Affected: 75d95e2e39b27f733f21e6668af1c9893a97de5e , < b48373c901951fad1a26bd7c33ad91172b3945b5 (git)
Affected: 67cf0fbcac0d42d4d4686cddc1e39f465bbfec37 (git)
Affected: d09639528b66b5c7c20dc8f7fb8928aacabd40bb (git)
Affected: c14a54675db7131791402fa22fb0fa6da1f5fb66 (git)
Affected: 5.10.58 , < 5.10.270 (semver)
Affected: 4.19.203 , < 4.20 (semver)
Affected: 5.4.140 , < 5.5 (semver)
Affected: 5.13.10 , < 5.14 (semver)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: do not queue completed sysfs fallback requests\n\nfw_load_sysfs_fallback() calls device_add() before adding the fw_priv to\npending_fw_head. device_add() publishes the fallback loading interface, so\na userspace helper which discovers the device by scanning sysfs can write 0\nto the loading attribute and complete the request before it is queued as\npending.\n\nIn that interleaving firmware_loading_store() calls fw_state_done() while\npending_list still points to itself, so it cannot remove an entry from\npending_fw_head. The subsequent unconditional list_add() then queues an\nalready-completed fw_priv. Once the request is released, pending_fw_head\ncan retain a pointer to freed memory and the next fallback request can\nfault while validating the list.\n\nOnly in-flight fallback requests need suspend or reboot abort handling. If\nthe request is already DONE after device_add(), return success from the\nfallback path without sending another uevent, waiting again, or queueing it\nas pending. This preserves the invariant that pending_fw_head contains only\nactive fallback requests."
          }
        ],
        "id": "CVE-2026-90284",
        "lastModified": "2026-09-17T17:17:25.203",
        "metrics": {},
        "published": "2026-09-17T17:17:25.203",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5a250bff75a446374c05622973b18b4ab662b504"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/93a2385730540105df8524447dcc11309ad280f9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b48373c901951fad1a26bd7c33ad91172b3945b5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ea33fac0df7fe7b49a4b27acb83e227b82317d1d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fb4824880b0dba0e7b3a497c46c642f979630392"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-22T16:29:38Z",
      "cve": "CVE-2026-90284",
      "id": "CVE-2026-90284",
      "initial_release_date": "2026-09-18T00:18:51Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "171",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90284",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90284.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.