CVE-2024-56573 (GCVE-0-2024-56573)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:23 – Updated: 2026-08-05 11:45
VLAI
Title
efi/libstub: Free correct pointer on failure
Summary
In the Linux kernel, the following vulnerability has been resolved: efi/libstub: Free correct pointer on failure cmdline_ptr is an out parameter, which is not allocated by the function itself, and likely points into the caller's stack. cmdline refers to the pool allocation that should be freed when cleaning up after a failure, so pass this instead to free_pool().
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 , < d173aee5709bd0994d216d60589ec67f8b11376a (git)
Affected: 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 , < eaafbcf0a5782ae412ca7de12ef83fc48ccea4cf (git)
Affected: 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 , < 06d39d79cbd5a91a33707951ebf2512d0e759847 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.12.4 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/libstub/efi-stub.c"
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              "value": "AV:L - The vulnerable code is the EFI stub entry point (`efi_pe_entry`/`efi_zboot_entry`), which executes only in the UEFI pre-boot environment on arm64/ARM/RISC-V/LoongArch; it is not bound to any network stack. An attacker needs local access to the machine to influence the boot environment and cause the kernel image to be loaded.\nAC:H - The `fail_free_cmdline` path is only reachable when `efi_parse_options()`\u0027s `allocate_pool` of a \u2264COMMAND_LINE_SIZE buffer fails, i.e. UEFI boot-services pool exhaustion \u2014 a firmware memory state the attacker cannot reliably influence, since the immediately preceding `efi_convert_cmdline()` allocation of comparable size already succeeded.\nPR:L - Reaching the stub requires a local foothold sufficient to influence the boot (boot entry/command line, chainloaded image, or a reboot on an embedded/kiosk arm64 device); no OS root or CAP_SYS_ADMIN in the running kernel is required.\nUI:N - No victim action is needed \u2014 the attacker with local access triggers the boot themselves, and the faulty path executes automatically inside the stub with no user prompt or interaction.\nS:U - The EFI stub already runs with full UEFI boot-services privilege by design, so corrupting the firmware pool does not cross into a different security authority; this is the standard \"same privilege domain\" case rather than a VM/IOMMU boundary escape.\nC:H - Firmware `FreePool()` on a stack address links stub stack memory into the boot-services free list, so that memory can later be handed to other allocations and read back; allocator-metadata corruption in the pre-boot environment is leverageable as an arbitrary-read primitive.\nI:H - Corrupting the UEFI pool allocator\u0027s free list yields attacker-influenced writes into fully privileged pre-boot memory, which is exploitable for control-flow hijack before any kernel hardening or Secure Boot lockdown is in effect.\nA:H - The invalid free hangs the boot outright on firmware that asserts on a bad pool signature (EDK2 DEBUG deadloop), and otherwise corrupts firmware heap state; the real `cmdline` pool allocation is additionally leaked on every occurrence."
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    "datePublished": "2024-12-27T14:23:16.231Z",
    "dateReserved": "2024-12-27T14:03:05.998Z",
    "dateUpdated": "2026-08-05T11:45:08.677Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2025-11-25T08:45:22+00:00",
      "cve": "CVE-2024-56573",
      "id": "CVE-2024-56573",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: efi/libstub: Free correct pointer on failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56573.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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