Linux Distros Unpatched Vulnerability : CVE-2026-23435

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

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  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/25");

  script_cve_id("CVE-2026-23435");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-23435");

  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.

  - perf/x86: Move event pointer setup earlier in x86_pmu_enable() A production AMD EPYC system crashed with a
    NULL pointer dereference in the PMU NMI handler: BUG: kernel NULL pointer dereference, address:
    0000000000000198 RIP: x86_perf_event_update+0xc/0xa0 Call Trace: <NMI> amd_pmu_v2_handle_irq+0x1a6/0x390
    perf_event_nmi_handler+0x24/0x40 The faulting instruction is `cmpq $0x0, 0x198(%rdi)` with RDI=0,
    corresponding to the `if (unlikely(!hwc->event_base))` check in x86_perf_event_update() where hwc =
    &event->hw and event is NULL. drgn inspection of the vmcore on CPU 106 showed a mismatch between
    cpuc->active_mask and cpuc->events[]: active_mask: 0x1e (bits 1, 2, 3, 4) events[1]: 0xff1100136cbd4f38
    (valid) events[2]: 0x0 (NULL, but active_mask bit 2 set) events[3]: 0xff1100076fd2cf38 (valid) events[4]:
    0xff1100079e990a90 (valid) The event that should occupy events[2] was found in event_list[2] with hw.idx=2
    and hw.state=0x0, confirming x86_pmu_start() had run (which clears hw.state and sets active_mask) but
    events[2] was never populated. Another event (event_list[0]) had hw.state=0x7 (STOPPED|UPTODATE|ARCH),
    showing it was stopped when the PMU rescheduled events, confirming the throttle-then-reschedule sequence
    occurred. The root cause is commit 7e772a93eb61 (perf/x86: Fix NULL event access and potential PEBS
    record loss) which moved the cpuc->events[idx] assignment out of x86_pmu_start() and into step 2 of
    x86_pmu_enable(), after the PERF_HES_ARCH check. This broke any path that calls pmu->start() without going
    through x86_pmu_enable() -- specifically the unthrottle path: perf_adjust_freq_unthr_events() ->
    perf_event_unthrottle_group() -> perf_event_unthrottle() -> event->pmu->start(event, 0) -> x86_pmu_start()
    // sets active_mask but not events[] The race sequence is: 1. A group of perf events overflows, triggering
    group throttle via perf_event_throttle_group(). All events are stopped: active_mask bits cleared, events[]
    preserved (x86_pmu_stop no longer clears events[] after commit 7e772a93eb61). 2. While still throttled
    (PERF_HES_STOPPED), x86_pmu_enable() runs due to other scheduling activity. Stopped events that need to
    move counters get PERF_HES_ARCH set and events[old_idx] cleared. In step 2 of x86_pmu_enable(),
    PERF_HES_ARCH causes these events to be skipped -- events[new_idx] is never set. 3. The timer tick
    unthrottles the group via pmu->start(). Since commit 7e772a93eb61 removed the events[] assignment from
    x86_pmu_start(), active_mask[new_idx] is set but events[new_idx] remains NULL. 4. A PMC overflow NMI
    fires. The handler iterates active counters, finds active_mask[2] set, reads events[2] which is NULL, and
    crashes dereferencing it. Move the cpuc->events[hwc->idx] assignment in x86_pmu_enable() to before the
    PERF_HES_ARCH check, so that events[] is populated even for events that are not immediately started. This
    ensures the unthrottle path via pmu->start() always finds a valid event pointer. (CVE-2026-23435)

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-2026-23435");
  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:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/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-2026-23435");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/03");
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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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          {"reference": "linux-lowlatency-hwe-5.19"},
          {"reference": "linux-lowlatency-hwe-6.2"},
          {"reference": "linux-lowlatency-hwe-6.5"},
          {"reference": "linux-modules-5.15.0"},
          {"reference": "linux-modules-5.17.0"},
          {"reference": "linux-modules-extra-5.15.0"},
          {"reference": "linux-modules-extra-5.17.0"},
          {"reference": "linux-nvidia-6.2"},
          {"reference": "linux-nvidia-6.5"},
          {"reference": "linux-oem-5.17-headers-5.17.0"},
          {"reference": "linux-oem-5.17-tools-5.17.0"},
          {"reference": "linux-oem-5.17-tools-host"},
          {"reference": "linux-oem-6.0"},
          {"reference": "linux-oem-6.1"},
          {"reference": "linux-oem-6.5"},
          {"reference": "linux-oracle-6.5"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-aws-6.14"},
          {"reference": "linux-aws-6.17"},
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.17"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-gcp-6.14"},
          {"reference": "linux-gcp-6.17"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"reference": "linux-hwe-6.17"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-nvidia-6.11"},
          {"reference": "linux-nvidia-6.17"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"reference": "linux-oem-6.17"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-oracle-6.14"},
          {"reference": "linux-oracle-6.17"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"reference": "linux-riscv-6.17"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-6.17.0"},
          {"reference": "linux-aws-headers-6.17.0"},
          {"reference": "linux-aws-tools-6.17.0"},
          {"reference": "linux-azure-cloud-tools-6.17.0"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-headers-6.17.0"},
          {"reference": "linux-azure-tools-6.17.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-6.17.0"},
          {"reference": "linux-cloud-tools-6.17.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-6.17.0"},
          {"reference": "linux-gcp-tools-6.17.0"},
          {"reference": "linux-headers-6.17.0"},
          {"reference": "linux-image-6.17.0"},
          {"reference": "linux-image-unsigned-6.17.0"},
          {"reference": "linux-lib-rust-6.17.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-6.17.0"},
          {"reference": "linux-modules-extra-6.17.0"},
          {"reference": "linux-modules-ipu6-6.17.0"},
          {"reference": "linux-modules-ipu7-6.17.0"},
          {"reference": "linux-modules-iwlwifi-6.17.0"},
          {"reference": "linux-modules-usbio-6.17.0"},
          {"reference": "linux-modules-vision-6.17.0"},
          {"reference": "linux-oracle-headers-6.17.0"},
          {"reference": "linux-oracle-tools-6.17.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-6.17.0"},
          {"reference": "linux-raspi-tools-6.17.0"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.17.0"},
          {"reference": "linux-riscv-tools-6.17.0"},
          {"reference": "linux-source-6.17.0"},
          {"reference": "linux-tools-6.17.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"},
          {"reference": "linux-udebs-azure"}
        ]
      }
    ]
  }
};

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 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');
}