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Linux Distros Unpatched Vulnerability : CVE-2024-26991

🗓️ 05 Mar 2025 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 6 Views

Linux/Unix hosts have unpatched vulnerability CVE-2024-26991 affecting certain packages without fixes.

Related
Refs
Code
ReporterTitlePublishedViews
Family
AlmaLinux		Important: kernel security update
24 Sep 202400:00
–almalinux
AstraLinux		 Astra Linux - уязвимость в linux-5.10
3 May 202623:59
–astralinux
BDU FSTEC		The vulnerability of the kvm_arch_post_set_memory_attributes() function in the arch/x86/kvm/mmu/mmu.c module of the Linux operating system allows a hacker to trigger a service failure.
19 Mar 202500:00
–bdu_fstec
CNNVD		Linux kernel 安全漏洞
1 May 202400:00
–cnnvd
CVE		CVE-2024-26991
1 May 202405:27
–cve
Cvelist		CVE-2024-26991 KVM: x86/mmu: x86: Don't overflow lpage_info when checking attributes
1 May 202405:27
–cvelist
Debian CVE		CVE-2024-26991
1 May 202405:27
–debiancve
Oracle linux		kernel security update
24 Sep 202400:00
–oraclelinux
Fedora		[SECURITY] Fedora 38 Update: kernel-6.8.8-100.fc38
3 May 202401:38
–fedora
Fedora		[SECURITY] Fedora 40 Update: kernel-6.8.8-300.fc40
3 May 202401:49
–fedora
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

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  script_set_attribute(attribute:"synopsis", value:
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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: KVM: x86/mmu: x86: Don't overflow
    lpage_info when checking attributes Fix KVM_SET_MEMORY_ATTRIBUTES to not overflow lpage_info array and
    trigger KASAN splat, as seen in the private_mem_conversions_test selftest. When memory attributes are set
    on a GFN range, that range will have specific properties applied to the TDP. A huge page cannot be used
    when the attributes are inconsistent, so they are disabled for those the specific huge pages. For internal
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    allocated array of these for a specific supported page size. The kvm_lpage_info denotes whether a specific
    huge page (GFN and page size) on the memslot is supported. These arrays include indices for unaligned head
    and tail huge pages. Preventing huge pages from spanning adjacent memslot is covered by incrementing the
    count in head and tail kvm_lpage_info when the memslot is allocated, but disallowing huge pages for memory
    that has mixed attributes has to be done in a more complicated way. During the KVM_SET_MEMORY_ATTRIBUTES
    ioctl KVM updates lpage_info for each memslot in the range that has mismatched attributes. KVM does this a
    memslot at a time, and marks a special bit, KVM_LPAGE_MIXED_FLAG, in the kvm_lpage_info for any huge page.
    This bit is essentially a permanently elevated count. So huge pages will not be mapped for the GFN at that
    page size if the count is elevated in either case: a huge head or tail page unaligned to the memslot or if
    KVM_LPAGE_MIXED_FLAG is set because it has mixed attributes. To determine whether a huge page has
    consistent attributes, the KVM_SET_MEMORY_ATTRIBUTES operation checks an xarray to make sure it
    consistently has the incoming attribute. Since level - 1 huge pages are aligned to level huge pages, it
    employs an optimization. As long as the level - 1 huge pages are checked first, it can just check these
    and assume that if each level - 1 huge page contained within the level sized huge page is not mixed, then
    the level size huge page is not mixed. This optimization happens in the helper hugepage_has_attrs().
    Unfortunately, although the kvm_lpage_info array representing page size 'level' will contain an entry for
    an unaligned tail page of size level, the array for level - 1 will not contain an entry for each GFN at
    page size level. The level - 1 array will only contain an index for any unaligned region covered by level
    - 1 huge page size, which can be a smaller region. So this causes the optimization to overflow the level -
    1 kvm_lpage_info and perform a vmalloc out of bounds read. In some cases of head and tail pages where an
    overflow could happen, callers skip the operation completely as KVM_LPAGE_MIXED_FLAG is not required to
    prevent huge pages as discussed earlier. But for memslots that are smaller than the 1GB page size, it does
    call hugepage_has_attrs(). In this case the huge page is both the head and tail page. The issue can be
    observed simply by compiling the kernel with CONFIG_KASAN_VMALLOC and running the selftest
    private_mem_conversions_test, which produces the output like the following: BUG: KASAN: vmalloc-out-of-
    bounds in hugepage_has_attrs+0x7e/0x110 Read of size 4 at addr ffffc900000a3008 by task
    private_mem_con/169 Call Trace: dump_stack_lvl print_report ? __virt_addr_valid ? hugepage_has_attrs ?
    hugepage_has_attrs kasan_report ? hugepage_has_attrs hugepage_has_attrs
    kvm_arch_post_set_memory_attributes kvm_vm_ioctl It is a little ambiguous whether the unaligned head page
    (in the bug case also the tail page) should be expected to have KVM_LPAGE_MIXED_FLAG set. It is not
    functionally required, as the unal ---truncated--- (CVE-2024-26991)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  script_set_attribute(attribute:"solution", value:
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  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
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  exit(0);
}

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');

var distro_constraints_array = {
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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
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          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
          {"reference": "linux-azure-headers-4.15.0"},
          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
          {"reference": "linux-gcp-5.3"},
          {"reference": "linux-gcp-headers-4.15.0"},
          {"reference": "linux-gcp-tools-4.15.0"},
          {"reference": "linux-gke-4.15"},
          {"reference": "linux-gke-5.4"},
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          {"reference": "linux-udebs-oem"}
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    "package_manager": "dpkg-l",
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          {"reference": "linux-oem-5.6-tools-5.6.0"},
          {"reference": "linux-oem-5.6-tools-common"},
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          {"reference": "linux-oracle-5.13"},
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          {"reference": "linux-raspi2"},
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          {"reference": "linux-riscv-5.8"},
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          {"reference": "linux-tools-5.4.0"},
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          {"reference": "linux-udebs-oem"}
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      }
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          {"reference": "linux-aws-6.2"},
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          {"reference": "linux-image-5.15.0"},
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          {"reference": "linux-intel-iot-realtime"},
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          {"reference": "linux-lowlatency-hwe-6.2"},
          {"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-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-realtime"},
          {"reference": "linux-riscv-5.19"},
          {"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-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "kernel-rt"},
          {"reference": "kernel-rt-core"},
          {"reference": "kernel-rt-debug"},
          {"reference": "kernel-rt-debug-core"},
          {"reference": "kernel-rt-debug-devel"},
          {"reference": "kernel-rt-debug-devel-matched"},
          {"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-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');
}

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06 Sep 2025 00:00Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.15.5
EPSS0.00015
SSVC
linux vulnerabilitiesunpatched vulnerabilitiescve-2024-26991linux kernelmemory attributeskvm issues.
6