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NVD / CVE Program· CNA Linux

CVE-2024-56720: bpf, sockmap: Several fixes to bpf_msg_pop_data

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.24% (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 275a9f3ef8fabb0cb282a62b9e164dedba7284c5, 5d609ba262475db450ba69b8e8a557bd768ac07a, 785180bed9879680d8e5c5e1b54c8ae8d948f4c8; azl3 kernel 6.6.57.1-7 on Azure Linux 3.0 6.6.64.2-1; azl3 kernel 6.6.64.2-1 on Azure Linux 3.0 6.6.64.2-1.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 275a9f3ef8fabb0cb282a62b9e164dedba7284c5, 5d609ba262475db450ba69b8e8a557bd768ac07a, 785180bed9879680d8e5c5e1b54c8ae8d948f4c8; azl3 kernel 6.6.57.1-7 on Azure Linux 3.0 6.6.64.2-1; azl3 kernel 6.6.64.2-1 on Azure Linux 3.0 6.6.64.2-1 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: bpf, sockmap: Several fixes to bpf_msg_pop_data Several fixes to bpf_msg_pop_data, 1. In sk_msg_shift_left, we should put_page 2. if (len == 0), return early is better 3. pop the entire sk_msg (last == msg->sg.size) should be supported 4. Fix for the value of variable "a" 5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG.

Published
Dec 29, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 15th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 point gap

CVSS:3.1/AV:L/AC:L/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-2024-56720

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 kernel5.0 and later · before 5.4.287
  • linux linux kernel5.5 and later · before 5.10.231
  • linux linux kernel5.11 and later · before 5.15.174
  • linux linux kernel5.16 and later · before 6.1.120
  • linux linux kernel6.2 and later · before 6.6.64
  • linux linux kernel6.7 and later · before 6.11.11
  • linux linux kernel6.12 and later · before 6.12.2

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

    • 5.0affected
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before d3f5763b3062514a234114e97bbde74d8d702449affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before d26d977633d1d0b8bf9407278189bd0a8d973323affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before e1f54c61c4c9a5244eb8159dce60d248f7d97b32affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before f58d3aa457e77a3d9b3df2ab081dcf9950f6029faffected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before 98c7ea7d11f2588e8197db042e0291e4ac8f8346affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before 785180bed9879680d8e5c5e1b54c8ae8d948f4c8affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before 275a9f3ef8fabb0cb282a62b9e164dedba7284c5affected · git
    • 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 and later · before 5d609ba262475db450ba69b8e8a557bd768ac07aaffected · git
    • before 5.0not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.123-16.1.123-1
Debian:13linuxbefore 6.12.3-16.12.3-1

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-2024-56717Dec 29, 2024 · net: mscc: ocelot: fix incorrect IFH SRC_PORT field in ocelot_ifh_set_basic()
    22Monitor
  • ← EarlierCVE-2024-56718Dec 29, 2024 · net/smc: protect link down work from execute after lgr freed
    22Monitor
  • Later →CVE-2024-56721Dec 29, 2024 · x86/CPU/AMD: Terminate the erratum_1386_microcode array
    28Monitor

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 Linux275a9f3ef8fabb0cb282a62b9e164dedba7284c5Vendor (CNA)
Linux Linux5d609ba262475db450ba69b8e8a557bd768ac07aVendor (CNA)
Linux Linux785180bed9879680d8e5c5e1b54c8ae8d948f4c8Vendor (CNA)
Linux Linux98c7ea7d11f2588e8197db042e0291e4ac8f8346Vendor (CNA)
Linux Linuxd26d977633d1d0b8bf9407278189bd0a8d973323Vendor (CNA)
Linux Linuxd3f5763b3062514a234114e97bbde74d8d702449Vendor (CNA)
Linux Linuxe1f54c61c4c9a5244eb8159dce60d248f7d97b32Vendor (CNA)
Linux Linuxf58d3aa457e77a3d9b3df2ab081dcf9950f6029fVendor (CNA)
azl3 kernel 6.6.57.1-7 on Azure Linux 3.06.6.64.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.64.2-1 on Azure Linux 3.06.6.64.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.123-1 · Debian:12Package 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-2023-38429531 days apartAn issue was discovered in the Linux kernel before 6.3.4.
    39Monitor
  • CVE-2024-5799059 days apartwifi: mt76: mt7925: fix off by one in mt7925_load_clc()
    31Monitor
  • CVE-2024-4768269 days apartscsi: sd: Fix off-by-one error in sd_read_block_characteristics()
    31Monitor
  • CVE-2024-4988069 days apartext4: fix off by one issue in alloc_flex_gd()
    31Monitor
  • CVE-2024-4685293 days apartdma-buf: heaps: Fix off-by-one in CMA heap fault handler
    31Monitor
  • CVE-2024-43852134 days aparthwmon: (ltc2991) re-order conditions to fix off by one bug
    31Monitor

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-193 · Off-by-one Error

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 (9 more)

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

All records