CVE-2026-43206 (GCVE-0-2026-43206)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-08-05 12:26
VLAI
Title
drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() The kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8 bytes via memset without checking the buffer size parameter. This allows unprivileged userspace to trigger an out-of bounds kernel memory write by passing a small buffer, leading to potential privilege escalation.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < 3e04bc310d80b46eaf481f1fefcbcb37a187412d (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < b4034442cb090e4a980bdcc1540948606cbc951b (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < 4857c37c7ba9aa38b9a4c694e8bd8d0091c87940 (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < 75fb57efdd7863fffbc39db23e9cad7aafda26ed (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < 4e72f419e4ed44cb3b60506752d8688c20a60a9b (git)
Affected: 0fc8011f89feb8b2c3008583b777d097e1974660 , < 8a70a26c9f34baea6c3199a9862ddaff4554a96d (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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        }
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            "version": "3.1"
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              "value": "AV:L - The vulnerable path is reached through local `/dev/kfd` ioctls, specifically allocating a KFD GPU memory object and passing its handle as `event_page_offset` to `AMDKFD_IOC_CREATE_EVENT`. There is no network, adjacent, or physical packet/device-input path.\nAC:L - The attacker controls the supplied event-page handle and can allocate a buffer smaller than `KFD_SIGNAL_EVENT_LIMIT * 8`, making the fixed-size `memset` out-of-bounds deterministic. No race or external condition is required.\nPR:L - The path is available to unprivileged userspace with access to KFD/AMDGPU device nodes, and the relevant ioctls have no capability flag or `capable()` gate. This is low privilege, not real administrator privilege.\nUI:N - Once a local attacker can execute code and open the device, exploitation only requires issuing ioctls. No victim user action is needed.\nS:U - The corruption occurs inside the kernel driver and impacts the same kernel security authority. This is standard local kernel compromise/DoS, not a cross-scope escape such as guest-to-host or IOMMU boundary bypass.\nC:H - The bug is an out-of-bounds kernel write into memory adjacent to a kernel-mapped GPU buffer, and kernel memory corruption can reasonably be leveraged to disclose sensitive kernel memory. Following the higher-severity rule for memory corruption, confidentiality impact is High.\nI:H - The vulnerable `memset` writes attacker-triggered data beyond the allocated object, giving a kernel memory corruption primitive. Out-of-bounds writes are scored as High integrity impact because they can plausibly be developed into privilege escalation or control-flow/data corruption.\nA:H - The out-of-bounds kernel write can corrupt adjacent kernel memory and readily crash or destabilize the kernel even without full exploitation. Kernel oops, panic, or persistent GPU/kernel failure is a High availability impact."
            }
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        "dateUpdated": "2026-08-05T12:26:33.242Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()",
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-20T07:57:48+00:00",
      "cve": "CVE-2026-43206",
      "id": "CVE-2026-43206",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43206.json",
      "version": "3"
    }
  }
}



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  • 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.