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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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Show details on NVD website
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_ctx.c"
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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",
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            "version": "3.1"
          },
          "scenarios": [
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              "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",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6875ee2bef48f5d9f045d81a8a4d68893f768a8a"
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          "url": "https://git.kernel.org/stable/c/e8fadbffc19a233d1eedebfb8df0f522d1388280"
        },
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          "url": "https://git.kernel.org/stable/c/faebb7ba1ac65fa5810b640df02ce04e509fdc11"
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    "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",
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      "product_status:known_not_affected": "274",
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      "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",
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      "cve": "CVE-2026-68380",
      "id": "CVE-2026-68380",
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      "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.


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.