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CVE-2024-46741 (GCVE-0-2024-46741)

Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-08-27 12:39
VLAI
Title
misc: fastrpc: Fix double free of 'buf' in error path
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix double free of 'buf' in error path smatch warning: drivers/misc/fastrpc.c:1926 fastrpc_req_mmap() error: double free of 'buf' In fastrpc_req_mmap() error path, the fastrpc buffer is freed in fastrpc_req_munmap_impl() if unmap is successful. But in the end, there is an unconditional call to fastrpc_buf_free(). So the above case triggers the double free of fastrpc buf.
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 2024-09-29 14:50 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 13327ed95222e70fa98805382b65636b872d87cb , < 4753cc37b6606ef9a7ec22861d380d45e2707f9a (git)
Affected: 72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2 , < f77dc8a75859e559f3238a6d906206259227985e (git)
Affected: 72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2 , < bfc1704d909dc9911a558b1a5833d3d61a43a1f2 (git)
Affected: 72fa6f7820c4cf96c5f7aabc4e54bdf52d1e2ac2 , < e8c276d4dc0e19ee48385f74426aebc855b49aaf (git)
Affected: 911737ad0c860251f640a05feb75f9dc7e41f0d7 (git)
Affected: b10e064ca0f708c4b4401ac5eab0f76cf7cec93d (git)
Affected: 5.10.267 , < 5.11 (semver)
Affected: 5.15.218 , < 5.16 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.51 , ≤ 6.6.* (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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Por lo tanto, el caso anterior activa la doble liberaci\u00f3n del b\u00fafer 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T09:02:00+00:00",
      "cve": "CVE-2024-46741",
      "id": "CVE-2024-46741",
      "initial_release_date": "2024-09-18T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: fastrpc: Fix double free of \u0026#39;buf\u0026#39; in error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-46741.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T13:59:53Z",
      "cve": "CVE-2024-46741",
      "id": "CVE-2024-46741",
      "initial_release_date": "2024-09-19T03:10:46Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "350",
      "product_status:recommended": "352",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-46741",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-46741.json",
      "version": "53"
    },
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No network or remote peer input reaches this path.\\nAC:L - The attacker deterministically forces the error path by passing a read-only user mapping as `argp`, so `copy_from_user()` succeeds but the final `copy_to_user()` returns `-EFAULT`, and the subsequent DSP munmap of the just-mapped buffer always succeeds \\u2014 no race or uncontrolled condition is involved.\\nPR:L - The fastrpc driver contains no `capable()` or `CAP_*` checks on any path to `fastrpc_req_mmap()`; any local user able to open the fastrpc device node (routinely granted to unprivileged applications on Qualcomm Android/embedded/laptop systems) can trigger it.\\nUI:N - The attacking process performs the entire sequence itself with two ioctls and its own memory mapping; no action by another user or victim is required.\\nS:U - The corruption is confined to the kernel\u0027s own slab and DMA/CMA allocators within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\\nC:H - The second `fastrpc_buf_free()` reads `buf-\u003edev/size/virt/phys` from freed slab memory, and the duplicated `dma_free_coherent()` releases pages that remain mappable to userspace via this driver\u0027s dma-buf `.mmap`, allowing an attacker-mapped page to be re-issued to another kernel consumer and read \\u2014 an arbitrary kernel-memory disclosure primitive.\\nI:H - 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      "cveMetadata": "{\"cveId\": \"CVE-2024-46741\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-27T12:39:34.666Z\", \"dateReserved\": \"2024-09-11T15:12:18.263Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-18T07:12:02.496Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.