Linux Distros Unpatched Vulnerability : CVE-2024-26960

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

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  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2024-26960");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-26960");

  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: mm: swap: fix race between
    free_swap_and_cache() and swapoff() There was previously a theoretical window where swapoff() could run
    and teardown a swap_info_struct while a call to free_swap_and_cache() was running in another thread. This
    could cause, amongst other bad possibilities, swap_page_trans_huge_swapped() (called by
    free_swap_and_cache()) to access the freed memory for swap_map. This is a theoretical problem and I
    haven't been able to provoke it from a test case. But there has been agreement based on code review that
    this is possible (see link below). Fix it by using get_swap_device()/put_swap_device(), which will stall
    swapoff(). There was an extra check in _swap_info_get() to confirm that the swap entry was not free. This
    isn't present in get_swap_device() because it doesn't make sense in general due to the race between
    getting the reference and swapoff. So I've added an equivalent check directly in free_swap_and_cache().
    Details of how to provoke one possible issue (thanks to David Hildenbrand for deriving this): --8<-----
    __swap_entry_free() might be the last user and result in count == SWAP_HAS_CACHE.
    swapoff->try_to_unuse() will stop as soon as soon as si->inuse_pages==0. So the question is: could someone
    reclaim the folio and turn si->inuse_pages==0, before we completed swap_page_trans_huge_swapped(). Imagine
    the following: 2 MiB folio in the swapcache. Only 2 subpages are still references by swap entries. Process
    1 still references subpage 0 via swap entry. Process 2 still references subpage 1 via swap entry. Process
    1 quits. Calls free_swap_and_cache(). -> count == SWAP_HAS_CACHE [then, preempted in the hypervisor etc.]
    Process 2 quits. Calls free_swap_and_cache(). -> count == SWAP_HAS_CACHE Process 2 goes ahead, passes
    swap_page_trans_huge_swapped(), and calls __try_to_reclaim_swap().
    __try_to_reclaim_swap()->folio_free_swap()->delete_from_swap_cache()->
    put_swap_folio()->free_swap_slot()->swapcache_free_entries()-> swap_entry_free()->swap_range_free()-> ...
    WRITE_ONCE(si->inuse_pages, si->inuse_pages - nr_entries); What stops swapoff to succeed after process 2
    reclaimed the swap cache but before process1 finished its call to swap_page_trans_huge_swapped()?
    --8<----- (CVE-2024-26960)

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-2024-26960");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-26960");
  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:N/C:C/I:C/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-2024-26960");

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  script_set_attribute(attribute:"vuln_publication_date", value:"2024/05/01");
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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")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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          {"reference": "kernel-rt-debug-modules-core"},
          {"reference": "kernel-rt-debug-modules-extra"},
          {"reference": "kernel-rt-debug-modules-internal"},
          {"reference": "kernel-rt-debug-modules-partner"},
          {"reference": "kernel-rt-devel"},
          {"reference": "kernel-rt-devel-matched"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-rt-modules-internal"},
          {"reference": "kernel-rt-modules-partner"},
          {"reference": "kernel-rt-selftests-internal"}
        ]
      }
    ]
  }
};

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');
}