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GHSA-Q88G-F4FR-FFWF

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:

accel/amdxdna: Fix use-after-free of mm_struct in job scheduler

amdxdna_cmd_submit() stores current->mm in job->mm without holding any reference. aie2_sched_job_run() later access job->mm from the DRM scheduler worker thread. With only a raw pointer and no structural reference, the mm_struct can be freed before the scheduler runs the job.

Fix this by calling mmgrab() to hold a structural mm_count reference for the lifetime of the job, paired with mmdrop() in every cleanup path.

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-2026-68380"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:31Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix use-after-free of mm_struct in job scheduler\n\namdxdna_cmd_submit() stores current-\u003emm in job-\u003emm without holding any\nreference. aie2_sched_job_run() later access job-\u003emm from the DRM\nscheduler worker thread. With only a raw pointer and no structural\nreference, the mm_struct can be freed before the scheduler runs the job.\n\nFix this by calling mmgrab() to hold a structural mm_count reference for\nthe lifetime of the job, paired with mmdrop() in every cleanup path.",
  "id": "GHSA-q88g-f4fr-ffwf",
  "modified": "2026-08-14T00:31:56Z",
  "published": "2026-08-10T15:33:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68380"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6875ee2bef48f5d9f045d81a8a4d68893f768a8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8fadbffc19a233d1eedebfb8df0f522d1388280"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/faebb7ba1ac65fa5810b640df02ce04e509fdc11"
    }
  ],
  "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-2026-68380 (GCVE-0-2026-68380)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-17 05:04

Title

accel/amdxdna: Fix use-after-free of mm_struct in job scheduler

Summary

In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Fix use-after-free of mm_struct in job scheduler amdxdna_cmd_submit() stores current->mm in job->mm without holding any reference. aie2_sched_job_run() later access job->mm from the DRM scheduler worker thread. With only a raw pointer and no structural reference, the mm_struct can be freed before the scheduler runs the job. Fix this by calling mmgrab() to hold a structural mm_count reference for the lifetime of the job, paired with mmdrop() in every cleanup path.

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 Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6875ee2bef48f5d9f…
https://git.kernel.org/stable/c/e8fadbffc19a233d1…
https://git.kernel.org/stable/c/faebb7ba1ac65fa58…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < 6875ee2bef48f5d9f045d81a8a4d68893f768a8a (git) Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < e8fadbffc19a233d1eedebfb8df0f522d1388280 (git) Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < faebb7ba1ac65fa5810b640df02ce04e509fdc11 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (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/accel/amdxdna/amdxdna_ctx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6875ee2bef48f5d9f045d81a8a4d68893f768a8a",
              "status": "affected",
              "version": "aac243092b707bb3018e951d470cc1a9bcbaba6c",
              "versionType": "git"
            },
            {
              "lessThan": "e8fadbffc19a233d1eedebfb8df0f522d1388280",
              "status": "affected",
              "version": "aac243092b707bb3018e951d470cc1a9bcbaba6c",
              "versionType": "git"
            },
            {
              "lessThan": "faebb7ba1ac65fa5810b640df02ce04e509fdc11",
              "status": "affected",
              "version": "aac243092b707bb3018e951d470cc1a9bcbaba6c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_ctx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "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": "6.18.42",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix use-after-free of mm_struct in job scheduler\n\namdxdna_cmd_submit() stores current-\u003emm in job-\u003emm without holding any\nreference. aie2_sched_job_run() later access job-\u003emm from the DRM\nscheduler worker thread. With only a raw pointer and no structural\nreference, the mm_struct can be freed before the scheduler runs the job.\n\nFix this by calling mmgrab() to hold a structural mm_count reference for\nthe lifetime of the job, paired with mmdrop() in every cleanup path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is the AMDXDNA_EXEC_CMD ioctl on the /dev/accel/accel* accel/DRM node, requiring local access to the device file; there is no remote or adjacent-network entry point into the NPU job scheduler.\nAC:L - The attacker controls both sides of the lifetime race: it can saturate the hwctx job semaphore with long-running commands to keep jobs queued, then submit from a forked task sharing the fd and exit that task so its mm_struct is freed while the job is still pending. No condition outside attacker control is needed.\nPR:L - The EXEC_CMD ioctl is registered with no privilege flags (unlike SET_STATE which is DRM_ROOT_ONLY), so any unprivileged local user holding an open handle to the accel render node can submit jobs and trigger the bug.\nUI:N - Exploitation is entirely driven by the attacker\u0027s own process tree (open, submit, fork, exit); no victim action or interaction with any other user is required.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no crossing of a VM, IOMMU or sandbox boundary as a direct consequence of the flaw.\nC:H - The freed mm_struct is reallocated from a general kernel cache, and the driver\u0027s continued use of it (mmget_not_zero, later mmput_async/__mmput walking page tables) gives an attacker who sprays the reclaimed slot a path to disclose arbitrary kernel memory.\nI:H - mmget_not_zero() performs an atomic increment into freed memory and mmput_async() can drive a reclaimed object through __mmput()/exit_mmap(), yielding controlled kernel writes and page-table teardown on attacker-shaped data, i.e. a route to privilege escalation.\nA:H - Even without full exploitation the use-after-free reliably corrupts an mm_struct that the kernel then dereferences and tears down, causing oops or panic and rendering the system unavailable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:26.414Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6875ee2bef48f5d9f045d81a8a4d68893f768a8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8fadbffc19a233d1eedebfb8df0f522d1388280"
        },
        {
          "url": "https://git.kernel.org/stable/c/faebb7ba1ac65fa5810b640df02ce04e509fdc11"
        }
      ],
      "title": "accel/amdxdna: Fix use-after-free of mm_struct in job scheduler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68380",
    "datePublished": "2026-08-10T12:03:58.536Z",
    "dateReserved": "2026-07-30T09:28:09.387Z",
    "dateUpdated": "2026-08-17T05:04:26.414Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
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GHSA-Q88G-F4FR-FFWF

CVE-2026-68380 (GCVE-0-2026-68380)

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