Vulnerability-Lookup

GHSA-RQRW-7V4F-GFW3

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: fix 32-bit overflow in CWSR total size calculation

total_cwsr_size was computed in 32-bit before being used as a BO/SVM allocation size. With large ctx_save_restore_area_size and debug_memory_size multiplied by the XCC count, the product can wrap, yielding an undersized CWSR save area that firmware later overruns.

Promote total_cwsr_size to u64 and use check_add_overflow()/ check_mul_overflow() in both kfd_queue_acquire_buffers() and kfd_queue_release_buffers().

(cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68257"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:14Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix 32-bit overflow in CWSR total size calculation\n\ntotal_cwsr_size was computed in 32-bit before being used as a BO/SVM\nallocation size.\nWith large ctx_save_restore_area_size and debug_memory_size\nmultiplied by the XCC count, the product can wrap,\nyielding an undersized CWSR save area that firmware later overruns.\n\nPromote total_cwsr_size to u64 and use check_add_overflow()/\ncheck_mul_overflow() in both kfd_queue_acquire_buffers() and\nkfd_queue_release_buffers().\n\n(cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)",
  "id": "GHSA-rqrw-7v4f-gfw3",
  "modified": "2026-08-14T00:31:53Z",
  "published": "2026-08-10T15:33:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68257"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b0386d4293920e690c0e017708f999b93cc729b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/865532d54eb57b660b1cb1b0e1755776ce21b849"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abce3276c57e36c955627307469b9f009057a467"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b88ffe6593607364a8c06a48c6f29e55437cdf8e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68257 (GCVE-0-2026-68257)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-18 06:55

Title

drm/amdkfd: fix 32-bit overflow in CWSR total size calculation

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix 32-bit overflow in CWSR total size calculation total_cwsr_size was computed in 32-bit before being used as a BO/SVM allocation size. With large ctx_save_restore_area_size and debug_memory_size multiplied by the XCC count, the product can wrap, yielding an undersized CWSR save area that firmware later overruns. Promote total_cwsr_size to u64 and use check_add_overflow()/ check_mul_overflow() in both kfd_queue_acquire_buffers() and kfd_queue_release_buffers(). (cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b88ffe6593607364a…
https://git.kernel.org/stable/c/abce3276c57e36c95…
https://git.kernel.org/stable/c/865532d54eb57b660…
https://git.kernel.org/stable/c/2b0386d4293920e69…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 325aa07165394b8e866ffe9ec1d4c99d9195b2f2 , < b88ffe6593607364a8c06a48c6f29e55437cdf8e (git) Affected: d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 , < abce3276c57e36c955627307469b9f009057a467 (git) Affected: d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 , < 865532d54eb57b660b1cb1b0e1755776ce21b849 (git) Affected: d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 , < 2b0386d4293920e690c0e017708f999b93cc729b (git) Affected: 63600103d2ac5c09fdeec5b931b396e4e0efd5d8 (git) Affected: 6.12.59 , < 6.12.101 (semver) Affected: 6.17.9 , < 6.18 (semver)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_queue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
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              "lessThan": "b88ffe6593607364a8c06a48c6f29e55437cdf8e",
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              "versionType": "git"
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            {
              "lessThan": "abce3276c57e36c955627307469b9f009057a467",
              "status": "affected",
              "version": "d15deafab5d722afb9e2f83c5edcdef9d9d98bd1",
              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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            {
              "status": "affected",
              "version": "63600103d2ac5c09fdeec5b931b396e4e0efd5d8",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6.12.59",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "6.17.9",
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.12.59",
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                },
                {
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                  "versionEndExcluding": "6.18.42",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix 32-bit overflow in CWSR total size calculation\n\ntotal_cwsr_size was computed in 32-bit before being used as a BO/SVM\nallocation size.\nWith large ctx_save_restore_area_size and debug_memory_size\nmultiplied by the XCC count, the product can wrap,\nyielding an undersized CWSR save area that firmware later overruns.\n\nPromote total_cwsr_size to u64 and use check_add_overflow()/\ncheck_mul_overflow() in both kfd_queue_acquire_buffers() and\nkfd_queue_release_buffers().\n\n(cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)"
        }
      ],
      "metrics": [
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
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              "lang": "en",
              "value": "AV:L - Triggered through the AMDKFD_IOC_CREATE_QUEUE ioctl on the local /dev/kfd character device; the attacker-controlled ctx_save_restore_size field comes straight from the ioctl argument struct with no remote reachability.\nAC:L - The overflow is pure deterministic arithmetic on a value the attacker fully controls \u2014 passing ctx_save_restore_size near 2^32 (or /NUM_XCC on multi-XCC MI300 parts) reliably wraps total_cwsr_size to 0 or a small value on every attempt, with no race or layout dependency.\nPR:L - Requires only an unprivileged local account with access to /dev/kfd, which is granted to the render group and is routinely available to ordinary users on ROCm hosts, GPU compute nodes, containers, Steam Deck/desktop and Chrome OS style systems; no capabilities are checked on this path.\nUI:N - The attacker creates the malicious compute queue entirely from its own process via a single ioctl; no action by any other user or administrator is needed.\nS:U - The undersized CWSR area and the resulting firmware overrun stay within the kernel/GPU driver security authority of the same machine; there is no hypervisor or IOMMU boundary crossed.\nC:H - With validation bypassed, CP firmware save/restore reads span memory adjacent to the tiny validated buffer and load it into wave state the attacker\u0027s shader can read back, and get_wave_state copies per-XCC control-stack contents out of the unvalidated region, giving a broad out-of-bounds disclosure primitive.\nI:H - The queue is programmed with the full unwrapped save size and per-XCC base offsets, so firmware performs large out-of-bounds writes of wave/control-stack data beyond the buffer that was actually validated and reference-counted, and the bypassed queue_refcount lets those buffers be unmapped or freed while the queue is live \u2014 an attacker-influenced memory-corruption primitive.\nA:H - Overrunning the CWSR save area drives the GPU into unmapped VA on preemption, causing VM faults, queue hangs and driver-initiated GPU resets that take down all GPU workloads on the machine, including other tenants on shared compute nodes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T06:55:54.208Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "drm/amdkfd: fix 32-bit overflow in CWSR total size calculation",
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    "cveId": "CVE-2026-68257",
    "datePublished": "2026-08-10T12:01:30.547Z",
    "dateReserved": "2026-07-30T09:28:09.378Z",
    "dateUpdated": "2026-08-18T06:55:54.208Z",
    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.