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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-17 05:04
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < 6875ee2bef48f5d9f045d81a8a4d68893f768a8a (git)
Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < e8fadbffc19a233d1eedebfb8df0f522d1388280 (git)
Affected: aac243092b707bb3018e951d470cc1a9bcbaba6c , < faebb7ba1ac65fa5810b640df02ce04e509fdc11 (git)
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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": {
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          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_ctx.c"
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              "operator": "OR"
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          "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": [
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            "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"
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          "url": "https://git.kernel.org/stable/c/6875ee2bef48f5d9f045d81a8a4d68893f768a8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8fadbffc19a233d1eedebfb8df0f522d1388280"
        },
        {
          "url": "https://git.kernel.org/stable/c/faebb7ba1ac65fa5810b640df02ce04e509fdc11"
        }
      ],
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  "cveMetadata": {
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    "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"
  },
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-14T14:18:42+00:00",
      "cve": "CVE-2026-68380",
      "id": "CVE-2026-68380",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/amdxdna: Fix use-after-free of mm_struct in job scheduler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68380.json",
      "version": "3"
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      "cve": "CVE-2026-68380",
      "id": "CVE-2026-68380",
      "initial_release_date": "2026-08-12T16:22:32Z",
      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68380",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68380.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.