CVE-2026-68271 (GCVE-0-2026-68271)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-17 05:02
VLAI
Title
drm/nouveau: fix reversed error cleanup order in ucopy functions
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix reversed error cleanup order in ucopy functions nouveau_uvmm_vm_bind_ucopy() and nouveau_exec_ucopy() place their error cleanup labels in allocation order rather than reverse allocation order. On a u_memcpya() failure for in_sync.s, the goto to err_free_ops (or err_free_pushs) frees the first allocation and then falls through to err_free_ins, which calls u_free() on args->in_sync.s. Since args->in_sync.s still holds the ERR_PTR returned by the failed u_memcpya(), and ERR_PTR values are not caught by ZERO_OR_NULL_PTR(), kvfree() proceeds to dereference it, which can result in a kernel oops. A failure for out_sync.s instead jumps to err_free_ins and skips freeing the first allocation, leading to a memory leak. Fix by swapping the cleanup label order so resources are freed in the correct reverse allocation sequence.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b88baab828713ce0b49b185444b2ee83bed373a8 , < 2473ac314387a5def7244eb6d6a345934ed140bf (git)
Affected: b88baab828713ce0b49b185444b2ee83bed373a8 , < e15c25c7972d38a9f6bf8c3f7f29179a67263eba (git)
Affected: b88baab828713ce0b49b185444b2ee83bed373a8 , < 4e109faa9ea2b6c04cc5a99e76db3126575a59d1 (git)
Affected: b88baab828713ce0b49b185444b2ee83bed373a8 , < ebbaf64d2635d1e78196c067fa8fa582a7dc17f7 (git)
Affected: b88baab828713ce0b49b185444b2ee83bed373a8 , < ab99ead646b1b833ecd57fe577a2816f2e848167 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (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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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_exec.c",
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: fix reversed error cleanup order in ucopy functions\n\nnouveau_uvmm_vm_bind_ucopy() and nouveau_exec_ucopy() place their error\ncleanup labels in allocation order rather than reverse allocation order.\nOn a u_memcpya() failure for in_sync.s, the goto to err_free_ops (or\nerr_free_pushs) frees the first allocation and then falls through to\nerr_free_ins, which calls u_free() on args-\u003ein_sync.s.\n\nSince args-\u003ein_sync.s still holds the ERR_PTR returned by the failed\nu_memcpya(), and ERR_PTR values are not caught by ZERO_OR_NULL_PTR(),\nkvfree() proceeds to dereference it, which can result in a kernel oops.\nA failure for out_sync.s instead jumps to err_free_ins and skips freeing\nthe first allocation, leading to a memory leak.\n\nFix by swapping the cleanup label order so resources are freed in the\ncorrect reverse allocation sequence."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:02:04.681Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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        },
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          "url": "https://git.kernel.org/stable/c/ebbaf64d2635d1e78196c067fa8fa582a7dc17f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab99ead646b1b833ecd57fe577a2816f2e848167"
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      ],
      "title": "drm/nouveau: fix reversed error cleanup order in ucopy functions",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68271",
    "datePublished": "2026-08-10T12:01:46.534Z",
    "dateReserved": "2026-07-30T09:28:09.378Z",
    "dateUpdated": "2026-08-17T05:02:04.681Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-12T21:46:03+00:00",
      "cve": "CVE-2026-68271",
      "id": "CVE-2026-68271",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "182",
      "product_status:known_not_affected": "94",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/nouveau: fix reversed error cleanup order in ucopy functions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68271.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:45:15Z",
      "cve": "CVE-2026-68271",
      "id": "CVE-2026-68271",
      "initial_release_date": "2026-08-14T17:14:49Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "266",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68271",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68271.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.

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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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