Linux Distros Unpatched Vulnerability : CVE-2025-21688

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

include('compat.inc');

if (description)
{
  script_id(243840);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/18");

  script_cve_id("CVE-2025-21688");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-21688");

  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/v3d: Assign job pointer to NULL
    before signaling the fence In commit e4b5ccd392b9 (drm/v3d: Ensure job pointer is set to NULL after job
    completion), we introduced a change to assign the job pointer to NULL after completing a job, indicating
    job completion. However, this approach created a race condition between the DRM scheduler workqueue and
    the IRQ execution thread. As soon as the fence is signaled in the IRQ execution thread, a new job starts
    to be executed. This results in a race condition where the IRQ execution thread sets the job pointer to
    NULL simultaneously as the `run_job()` function assigns a new job to the pointer. This race condition can
    lead to a NULL pointer dereference if the IRQ execution thread sets the job pointer to NULL after
    `run_job()` assigns it to the new job. When the new job completes and the GPU emits an interrupt,
    `v3d_irq()` is triggered, potentially causing a crash. [ 466.310099] Unable to handle kernel NULL pointer
    dereference at virtual address 00000000000000c0 [ 466.318928] Mem abort info: [ 466.321723] ESR =
    0x0000000096000005 [ 466.325479] EC = 0x25: DABT (current EL), IL = 32 bits [ 466.330807] SET = 0, FnV = 0
    [ 466.333864] EA = 0, S1PTW = 0 [ 466.337010] FSC = 0x05: level 1 translation fault [ 466.341900] Data
    abort info: [ 466.344783] ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 [ 466.350285] CM = 0, WnR = 0, TnD
    = 0, TagAccess = 0 [ 466.355350] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 466.360677] user pgtable: 4k
    pages, 39-bit VAs, pgdp=0000000089772000 [ 466.367140] [00000000000000c0] pgd=0000000000000000,
    p4d=0000000000000000, pud=0000000000000000 [ 466.375875] Internal error: Oops: 0000000096000005 [#1]
    PREEMPT SMP [ 466.382163] Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device
    algif_hash algif_skcipher af_alg bnep binfmt_misc vc4 snd_soc_hdmi_codec drm_display_helper cec
    brcmfmac_wcc spidev rpivid_hevc(C) drm_client_lib brcmfmac hci_uart drm_dma_helper pisp_be btbcm brcmutil
    snd_soc_core aes_ce_blk v4l2_mem2mem bluetooth aes_ce_cipher snd_compress videobuf2_dma_contig ghash_ce
    cfg80211 gf128mul snd_pcm_dmaengine videobuf2_memops ecdh_generic sha2_ce ecc videobuf2_v4l2 snd_pcm v3d
    sha256_arm64 rfkill videodev snd_timer sha1_ce libaes gpu_sched snd videobuf2_common sha1_generic
    drm_shmem_helper mc rp1_pio drm_kms_helper raspberrypi_hwmon spi_bcm2835 gpio_keys i2c_brcmstb rp1
    raspberrypi_gpiomem rp1_mailbox rp1_adc nvmem_rmem uio_pdrv_genirq uio i2c_dev drm ledtrig_pattern
    drm_panel_orientation_quirks backlight fuse dm_mod ip_tables x_tables ipv6 [ 466.458429] CPU: 0 UID: 1000
    PID: 2008 Comm: chromium Tainted: G C 6.13.0-v8+ #18 [ 466.467336] Tainted: [C]=CRAP [ 466.470306]
    Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT) [ 466.476157] pstate: 404000c9 (nZcv daIF +PAN -UAO
    -TCO -DIT -SSBS BTYPE=--) [ 466.483143] pc : v3d_irq+0x118/0x2e0 [v3d] [ 466.487258] lr :
    __handle_irq_event_percpu+0x60/0x228 [ 466.492327] sp : ffffffc080003ea0 [ 466.495646] x29:
    ffffffc080003ea0 x28: ffffff80c0c94200 x27: 0000000000000000 [ 466.502807] x26: ffffffd08dd81d7b x25:
    ffffff80c0c94200 x24: ffffff8003bdc200 [ 466.509969] x23: 0000000000000001 x22: 00000000000000a7 x21:
    0000000000000000 [ 466.517130] x20: ffffff8041bb0000 x19: 0000000000000001 x18: 0000000000000000 [
    466.524291] x17: ffffffafadfb0000 x16: ffffffc080000000 x15: 0000000000000000 [ 466.531452] x14:
    0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ 466.538613] x11: 0000000000000000 x10:
    0000000000000000 x9 : ffffffd08c527eb0 [ 466.545777] x8 : 0000000000000000 x7 : 0000000000000000 x6 :
    0000000000000000 [ 466.552941] x5 : ffffffd08c4100d0 x4 : ffffffafadfb0000 x3 : ffffffc080003f70 [
    466.560102] x2 : ffffffc0829e8058 x1 : 0000000000000001 x0 : 0000000000000000 [ 466.567263] Call trace: [
    466.569711] v3d_irq+0x118/0x2e0 [v3d] (P) [ 466. ---truncated--- (CVE-2025-21688)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-21688");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:S/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-21688");

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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/02/10");
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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/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
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  },
  "Ubuntu Linux-18.04": {
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        "release": "18.04",
        "pkgs": [
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          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
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          {"reference": "linux-gcp-headers-4.15.0"},
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  }
};

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}