CVE-2026-64124 (GCVE-0-2026-64124)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
net: devmem: reject dma-buf bind with non-page-aligned size or SG length
Summary
In the Linux kernel, the following vulnerability has been resolved: net: devmem: reject dma-buf bind with non-page-aligned size or SG length net_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be PAGE_SIZE multiples without checking: - tx_vec is sized dmabuf->size / PAGE_SIZE, and net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size before indexing tx_vec[virt_addr / PAGE_SIZE]. With size = N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base = N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past. - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner() covers the full byte len, so a non-page-multiple non-final sg desyncs num_niovs from the gen_pool region for every later sg, on both RX and TX. dma-buf does not require page-aligned sizes, so the bind path has to enforce what its own indexing assumes. Reject both with -EINVAL. The size check is TX-only (only tx_vec is sized off dmabuf->size); the SG-length check covers both directions.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bd61848900bff597764238f3a8ec67c815cd316e , < 134c517dfa63203287b2aad6558017f42435a02e (git)
Affected: bd61848900bff597764238f3a8ec67c815cd316e , < d5008e4e4ee6b739256b796702a7d1aae1b5c3b4 (git)
Affected: bd61848900bff597764238f3a8ec67c815cd316e , < 4eb82ba543421e9e38cc14e4e82058b78850df50 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf-\u003esize and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n  - tx_vec is sized dmabuf-\u003esize / PAGE_SIZE, and\n    net_devmem_get_niov_at() only bounds-checks virt_addr \u003c dmabuf-\u003esize\n    before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n    N*PAGE_SIZE + r (1 \u003c= r \u003c PAGE_SIZE), sendmsg() at iov_base =\n    N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n  - owner-\u003earea.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n    covers the full byte len, so a non-page-multiple non-final sg\n    desyncs num_niovs from the gen_pool region for every later sg, on\n    both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf-\u003esize); the\nSG-length check covers both directions."
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    "datePublished": "2026-07-19T15:40:21.879Z",
    "dateReserved": "2026-07-19T07:54:57.036Z",
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    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:04:35+00:00",
      "cve": "CVE-2026-64124",
      "id": "CVE-2026-64124",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: devmem: reject dma-buf bind with non-page-aligned size or SG length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64124.json",
      "version": "3"
    }
  }
}



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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

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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.