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NVD / CVE Program· CNA Linux

CVE-2024-56573: efi/libstub: Free correct pointer on failure

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 06d39d79cbd5a91a33707951ebf2512d0e759847, d173aee5709bd0994d216d60589ec67f8b11376a, eaafbcf0a5782ae412ca7de12ef83fc48ccea4cf.

Low priority for now. Upgrade to Linux Linux 06d39d79cbd5a91a33707951ebf2512d0e759847, d173aee5709bd0994d216d60589ec67f8b11376a, eaafbcf0a5782ae412ca7de12ef83fc48ccea4cf or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Dec 27, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
5.5
CNA · Linux
7.0
1.5 point gap

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-56573

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.2 and later · before 6.6.64
  • linux linux kernel6.7 and later · before 6.12.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.2affected
    • 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 and later · before d173aee5709bd0994d216d60589ec67f8b11376aaffected · git
    • 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 and later · before eaafbcf0a5782ae412ca7de12ef83fc48ccea4cfaffected · git
    • 42c8ea3dca094ab82776ca706fb7a9cbe8ac3dc9 and later · before 06d39d79cbd5a91a33707951ebf2512d0e759847affected · git
    • before 6.2not affected · semver
    • 6.6.64 and later · up to and including 6.6.*not affected · semver
    • 6.12.4 and later · up to and including 6.12.*not affected · semver
    • 6.13 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.5-16.12.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-56568Dec 27, 2024 · iommu/arm-smmu: Defer probe of clients after smmu device bound
    18Monitor
  • ← EarlierCVE-2024-56572Dec 27, 2024 · media: platform: allegro-dvt: Fix possible memory leak in allocate_buffers_internal()
    22Monitor
  • Later →CVE-2024-56574Dec 27, 2024 · media: ts2020: fix null-ptr-deref in ts2020_probe()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux06d39d79cbd5a91a33707951ebf2512d0e759847Vendor (CNA)
Linux Linuxd173aee5709bd0994d216d60589ec67f8b11376aVendor (CNA)
Linux Linuxeaafbcf0a5782ae412ca7de12ef83fc48ccea4cfVendor (CNA)
debian:linux6.12.5-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2021-47087298 days aparttee: optee: Fix incorrect page free bug
    31Monitor
  • CVE-2024-42132150 days apartbluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX
    28Monitor
  • CVE-2022-4916061 days apartscsi: qla2xxx: Fix crash during module load unload test
    22Monitor
  • CVE-2022-48835164 days apartscsi: mpt3sas: Page fault in reply q processing
    22Monitor
  • CVE-2024-38617191 days apartkunit/fortify: Fix mismatched kvalloc()/vfree() usage
    22Monitor
  • CVE-2024-36890211 days apartmm/slab: make __free(kfree) accept error pointers
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-763 · Release of Invalid Pointer or Reference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records