CVE-2026-23424 (GCVE-0-2026-23424)

Vulnerability from cvelistv5 – Published: 2026-04-03 13:24 – Updated: 2026-08-05 12:21
VLAI
Title
accel/amdxdna: Validate command buffer payload count
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Validate command buffer payload count The count field in the command header is used to determine the valid payload size. Verify that the valid payload does not exceed the remaining buffer space.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < 3464e751755172ddbb849c1bd92f5f59e95c59a1 (git)
Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < 3ed2ae6b3fe869f99b75afd02045ba5c0c0773e2 (git)
Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < 901ec3470994006bc8dd02399e16b675566c3416 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_ctx.c"
          ],
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            },
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              "version": "6.19.7",
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            },
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              "value": "AV:L - The vulnerable command payload parsing is reached through local DRM accel device ioctls on /dev/accel/accelN, after creating and submitting an AMDXDNA command BO. It is not reachable from network or adjacent protocols.\nAC:L - The attacker controls the command BO header count and size and can trigger the over-read through normal create-hwctx/create-bo/exec-cmd ioctl flow. No race or condition outside attacker control is required.\nPR:L - The relevant amdxdna ioctls are not marked DRM_ROOT_ONLY and do not require CAP_SYS_ADMIN; a local unprivileged user with access to the accel device can reach them. This is basic local user access, not real root.\nUI:N - Exploitation is performed entirely by the attacking process issuing ioctls and submitting crafted command buffers. No victim user action is needed.\nS:U - The impact is within the local kernel/driver security authority on the same host. I found no VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The missing count validation permits out-of-bounds reads past the user command BO, with lengths large enough to copy substantial adjacent kernel-mapped memory into firmware/device command buffers. Under the higher-severity rule, this is a high confidentiality impact.\nI:N - The vulnerable count path over-reads the source command BO, while the observed destination copies are separately bounded. I did not find a kernel out-of-bounds write or control-flow modification primitive caused by this specific missing check.\nA:H - The out-of-bounds kernel read can fault/oops when it crosses unmapped vmalloc or invalid mapped memory, and it is repeatable through crafted command submissions. Kernel crash or scheduler/firmware destabilization is high availability impact."
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    "cveId": "CVE-2026-23424",
    "datePublished": "2026-04-03T13:24:32.622Z",
    "dateReserved": "2026-01-13T15:37:46.015Z",
    "dateUpdated": "2026-08-05T12:21:38.064Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:20:55+00:00",
      "cve": "CVE-2026-23424",
      "id": "CVE-2026-23424",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/amdxdna: Validate command buffer payload count",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23424.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

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.