Linux Distros Unpatched Vulnerability : CVE-2026-68437

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/12");

  script_cve_id("CVE-2026-68437");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-68437");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Fit paired fragment
    job in the correct CCCB For geometry jobs with a paired fragment job, at the moment, the DRM scheduler's
    prepare_job() callback: - checks for internal (driver) dependencies for the geometry job; - calls into
    pvr_queue_get_paired_frag_job_dep() to check for external dependencies for the fragment job (the two jobs
    are submitted together but the common scheduler code doesn't know about it, so this needs to be done at
    this point in time); - calls into the prepare_job() callback again, but for the fragment job, to check its
    internal dependencies as well, passing the fragment job's drm_sched_job and the geometry job's
    drm_sched_entity / pvr_queue. The problem with the last step is that pvr_queue_prepare_job() doesn't
    always take the mismatched fragment job and geometry queue into account, in particular when checking
    whether there is space for the fragment command to be submitted, so the code ends up checking for space in
    the geometry (i.e. wrong) CCCB. The rest of the nested prepare_job() callback happens to work fine at the
    moment as the other internal dependencies are not relevant for a paired fragment job. Move the
    initialisation of a paired fragment job's done fence and CCCB fence to
    pvr_queue_get_paired_frag_job_dep(), inferring the correct queue from the fragment job itself. This fixes
    cases where prepare_job() wrongly assumed that there was enough space for a paired fragment job in its own
    CCCB, unblocking run_job(), which then returned early without writing the full sequence of commands to the
    CCCB. The above lead to kernel warnings such as the following and potentially job timeouts (depending on
    waiters on the missing commands): [ 552.421075] WARNING: drivers/gpu/drm/imagination/pvr_cccb.c:178 at
    pvr_cccb_write_command_with_header+0x2c4/0x330 [powervr], CPU#2: kworker/u16:5/63 [ 552.421230] Modules
    linked in: [ 552.421592] CPU: 2 UID: 0 PID: 63 Comm: kworker/u16:5 Tainted: G W 7.0.0-rc2-gc5d053e4dccb
    #39 PREEMPT [ 552.421625] Tainted: [W]=WARN [ 552.421637] Hardware name: Texas Instruments AM625 SK (DT) [
    552.421655] Workqueue: powervr-sched drm_sched_run_job_work [gpu_sched] [ 552.421744] pstate: 80000005
    (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 552.421766] pc :
    pvr_cccb_write_command_with_header+0x2c4/0x330 [powervr] [ 552.421850] lr :
    pvr_queue_submit_job_to_cccb+0x57c/0xa74 [powervr] [ 552.421923] sp : ffff800084c47650 [ 552.421936] x29:
    ffff800084c47740 x28: 0000000000000df8 x27: ffff800088a77000 [ 552.421979] x26: 0000000000000030 x25:
    ffff800084c47680 x24: 0000000000001000 [ 552.422017] x23: ffff800084c47820 x22: 1ffff00010988ecc x21:
    0000000000000008 [ 552.422055] x20: 0000000000000208 x19: ffff000006ad5a88 x18: 0000000000000000 [
    552.422093] x17: 0000000020020000 x16: 0000000000020000 x15: 0000000000000000 [ 552.422130] x14:
    0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 552.422167] x11: 000000000000f2f2 x10:
    00000000f3000000 x9 : 00000000f3f3f3f3 [ 552.422204] x8 : 00000000f2f2f200 x7 : ffff700010988ecc x6 :
    0000000000000008 [ 552.422241] x5 : 0000000000000000 x4 : 1ffff0001114ee00 x3 : 0000000000000000 [
    552.422278] x2 : 0000000000000007 x1 : 0000000000000fff x0 : 000000000000002f [ 552.422316] Call trace: [
    552.422330] pvr_cccb_write_command_with_header+0x2c4/0x330 [powervr] (P) [ 552.422411]
    pvr_queue_submit_job_to_cccb+0x57c/0xa74 [powervr] [ 552.422486] pvr_queue_run_job+0x3a4/0x990 [powervr] [
    552.422562] drm_sched_run_job_work+0x580/0xd48 [gpu_sched] [ 552.422623] process_one_work+0x520/0x1288 [
    552.422657] worker_thread+0x3f0/0xb3c [ 552.422679] kthread+0x334/0x3d8 [ 552.422706]
    ret_from_fork+0x10/0x20 (CVE-2026-68437)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-68437");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
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  script_set_attribute(attribute:"risk_factor", value:"Medium");

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  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Red Hat Enterprise Linux-10");

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if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "kernel"},
          {"reference": "kernel-64k"},
          {"reference": "kernel-64k-core"},
          {"reference": "kernel-64k-debug"},
          {"reference": "kernel-64k-debug-core"},
          {"reference": "kernel-64k-debug-devel"},
          {"reference": "kernel-64k-debug-devel-matched"},
          {"reference": "kernel-64k-debug-modules"},
          {"reference": "kernel-64k-debug-modules-core"},
          {"reference": "kernel-64k-debug-modules-extra"},
          {"reference": "kernel-64k-devel"},
          {"reference": "kernel-64k-devel-matched"},
          {"reference": "kernel-64k-modules"},
          {"reference": "kernel-64k-modules-core"},
          {"reference": "kernel-64k-modules-extra"},
          {"reference": "kernel-abi-stablelists"},
          {"reference": "kernel-core"},
          {"reference": "kernel-debug"},
          {"reference": "kernel-debug-core"},
          {"reference": "kernel-debug-devel"},
          {"reference": "kernel-debug-devel-matched"},
          {"reference": "kernel-debug-modules"},
          {"reference": "kernel-debug-modules-core"},
          {"reference": "kernel-debug-modules-extra"},
          {"reference": "kernel-debug-uki-virt"},
          {"reference": "kernel-devel"},
          {"reference": "kernel-devel-matched"},
          {"reference": "kernel-doc"},
          {"reference": "kernel-modules"},
          {"reference": "kernel-modules-core"},
          {"reference": "kernel-modules-extra"},
          {"reference": "kernel-modules-extra-matched"},
          {"reference": "kernel-rt"},
          {"reference": "kernel-rt-64k"},
          {"reference": "kernel-rt-64k-core"},
          {"reference": "kernel-rt-64k-debug"},
          {"reference": "kernel-rt-64k-debug-core"},
          {"reference": "kernel-rt-64k-debug-devel"},
          {"reference": "kernel-rt-64k-debug-modules"},
          {"reference": "kernel-rt-64k-debug-modules-core"},
          {"reference": "kernel-rt-64k-debug-modules-extra"},
          {"reference": "kernel-rt-64k-devel"},
          {"reference": "kernel-rt-64k-modules"},
          {"reference": "kernel-rt-64k-modules-core"},
          {"reference": "kernel-rt-64k-modules-extra"},
          {"reference": "kernel-rt-core"},
          {"reference": "kernel-rt-debug"},
          {"reference": "kernel-rt-debug-core"},
          {"reference": "kernel-rt-debug-devel"},
          {"reference": "kernel-rt-debug-kvm"},
          {"reference": "kernel-rt-debug-modules"},
          {"reference": "kernel-rt-debug-modules-core"},
          {"reference": "kernel-rt-debug-modules-extra"},
          {"reference": "kernel-rt-devel"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-tools"},
          {"reference": "kernel-tools-libs"},
          {"reference": "kernel-tools-libs-devel"},
          {"reference": "kernel-uki-virt"},
          {"reference": "kernel-uki-virt-addons"},
          {"reference": "kernel-zfcpdump"},
          {"reference": "kernel-zfcpdump-core"},
          {"reference": "kernel-zfcpdump-devel"},
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          {"reference": "rtla"},
          {"reference": "rv"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}