Linux Distros Unpatched Vulnerability : CVE-2026-46063

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

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  script_cve_id("CVE-2026-46063");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-46063");

  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: x86/shstk: Prevent deadlock during
    shstk sigreturn During sigreturn the shadow stack signal frame is popped. The kernel does this by reading
    the shadow stack using normal read accesses. When it can't assume the memory is shadow stack, it takes
    extra steps to makes sure it is reading actual shadow stack memory and not other normal readable memory.
    It does this by holding the mmap read lock while doing the access and checking the flags of the VMA.
    Unfortunately that is not safe. If the read of the shadow stack sigframe hits a page fault, the fault
    handler will try to recursively grab another mmap read lock. This normally works ok, but if a writer on
    another CPU is also waiting, the second read lock could fail and cause a deadlock. Fix this by not holding
    mmap lock during the read access to userspace. Instead use mmap_lock_speculate_...() to watch for changes
    between dropping mmap lock and the userspace access. Retry if anything grabbed an mmap write lock in
    between and could have changed the VMA. These mmap_lock_speculate_...() helpers use mm::mm_lock_seq, which
    is only available when PER_VMA_LOCK is configured. So make X86_USER_SHADOW_STACK depend on it. On x86,
    PER_VMA_LOCK is a default configuration for SMP kernels. So drop support for the other configs under the
    assumption that the !SMP shadow stack user base does not exist. Currently there is a check that skips the
    lookup work when the SSP can be assumed to be on a shadow stack. While reorganizing the function, remove
    the optimization to make the tricky code flows more common, such that issues like this cannot escape
    detection for so long. (CVE-2026-46063)

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-2026-46063");
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  script_set_attribute(attribute:"agent", value:"unix");
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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');

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          {"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"},
          {"reference": "kernel-selftests-internal"},
          {"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"},
          {"reference": "kernel-zfcpdump-devel-matched"},
          {"reference": "kernel-zfcpdump-modules"},
          {"reference": "kernel-zfcpdump-modules-core"},
          {"reference": "kernel-zfcpdump-modules-extra"},
          {"reference": "kernel-zfcpdump-modules-internal"},
          {"reference": "kernel-zfcpdump-modules-partner"},
          {"reference": "libperf"},
          {"reference": "libperf-devel"},
          {"reference": "perf"},
          {"reference": "python3-perf"},
          {"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 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');
}