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CVE-2022-48821 (GCVE-0-2022-48821)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:44 – Updated: 2026-08-05 08:52
VLAI
Title
misc: fastrpc: avoid double fput() on failed usercopy
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:57 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < 4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < a5ce7ee5fcc07583159f54ab4af5164de00148f5 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < e4382d0a39f9a1e260d62fdc079ddae5293c037d (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < 76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < 46963e2e0629cb31c96b1d47ddd89dc3d8990b34 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.4.180 , ≤ 5.4.* (semver)
Unaffected: 5.10.101 , ≤ 5.10.* (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T23:01:13+00:00",
      "cve": "CVE-2022-48821",
      "id": "CVE-2022-48821",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: fastrpc: avoid double fput() on failed usercopy",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48821.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:27:44Z",
      "cve": "CVE-2022-48821",
      "id": "CVE-2022-48821",
      "initial_release_date": "2024-07-17T04:18:53Z",
      "product_status:known_affected": "292",
      "product_status:known_not_affected": "184",
      "product_status:recommended": "558",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48821",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48821.json",
      "version": "55"
    },
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      "cveMetadata": "{\"cveId\": \"CVE-2022-48821\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:52:29.928Z\", \"dateReserved\": \"2024-07-16T11:38:08.901Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T11:44:07.965Z\", \"assignerShortName\": \"Linux\"}",
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  }
}



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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.


Detection rules are retrieved from Rulezet.


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.