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CVE-2024-26752· NVD / CVE Program· CNA Linux

l2tp: pass correct message length to ip6_append_data

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: 0.25% (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 0da15a70395182ee8cb75716baf00dddc0bea38d, 13cd1daeea848614e585b2c6ecc11ca9c8ab2500, 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0da15a70395182ee8cb75716baf00dddc0bea38d, 13cd1daeea848614e585b2c6ecc11ca9c8ab2500, 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79 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: l2tp: pass correct message length to ip6_append_data l2tp_ip6_sendmsg needs to avoid accounting for the transport header twice when splicing more data into an already partially-occupied skbuff. To manage this, we check whether the skbuff contains data using skb_queue_empty when deciding how much data to append using ip6_append_data. However, the code which performed the calculation was incorrect: ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0; ...due to C operator precedence, this ends up setting ulen to transhdrlen for messages with a non-zero length, which results in corrupted packets on the wire. Add parentheses to correct the calculation in line with the original intent.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 3, 2024
Updated
Jun 17, 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.

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-2024-26752

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
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • linux linux kernel5.4.258 and later · before 5.4.270
  • linux linux kernel5.10.198 and later · before 5.10.211
  • linux linux kernel5.15.135 and later · before 5.15.150
  • linux linux kernel6.1.57 and later · before 6.1.80
  • linux linux kernel4.19.296 and later · before 4.19.308
  • linux linux kernel6.7 and later · before 6.7.7
  • linux linux kernel6.6 and later · before 6.6.19
  • linux linux kernel4.14.327
  • linux linux kernel6.5.7
  • linux linux kernel6.8

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

    • 7626b9fed53092aa2147978070e610ecb61af844, fe80658c08e3001c80c5533cd41abfbb0e0e28fd, 6.6affected
    • 559d697c5d072593d22b3e0bd8b8081108aeaf59 and later · before 4c3ce64bc9d36ca9164dd6c77ff144c121011aaeaffected · git
    • 1fc793d68d50dee4782ef2e808913d5dd880bcc6 and later · before c1d3a84a67db910ce28a871273c992c3d7f9efb5affected · git
    • 96b2e1090397217839fcd6c9b6d8f5d439e705ed and later · before dcb4d14268595065c85dc5528056713928e17243affected · git
    • cd1189956393bf850b2e275e37411855d3bd86bb and later · before 0da15a70395182ee8cb75716baf00dddc0bea38daffected · git
    • f6a7182179c0ed788e3755ee2ed18c888ddcc33f and later · before 13cd1daeea848614e585b2c6ecc11ca9c8ab2500affected · git
    • 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 and later · before 804bd8650a3a2bf3432375f8c97d5049d845ce56affected · git
    • 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 and later · before 83340c66b498e49353530e41542500fc8a4782d6affected · git
    • 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 and later · before 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79affected · git
    • 4.19.296 and later · before 4.19.308affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-26749Apr 3, 2024 · usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()
    31Monitor
  • ← EarlierCVE-2024-26751Apr 3, 2024 · ARM: ep93xx: Add terminator to gpiod_lookup_table
    22Monitor
  • Later →CVE-2024-26753Apr 3, 2024 · crypto: virtio/akcipher - Fix stack overflow on memcpy
    31Monitor

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 Linux0da15a70395182ee8cb75716baf00dddc0bea38dVendor (CNA)
Linux Linux13cd1daeea848614e585b2c6ecc11ca9c8ab2500Vendor (CNA)
Linux Linux359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.19.308Vendor (CNA)
Linux Linux4c3ce64bc9d36ca9164dd6c77ff144c121011aaeVendor (CNA)
Linux Linux5.10.211Vendor (CNA)
Linux Linux5.15.150Vendor (CNA)
Linux Linux5.4.270Vendor (CNA)
Linux Linux6.1.80Vendor (CNA)
Linux Linux6.6Vendor (CNA)
Linux Linux804bd8650a3a2bf3432375f8c97d5049d845ce56Vendor (CNA)
Linux Linux83340c66b498e49353530e41542500fc8a4782d6Vendor (CNA)
Linux Linuxc1d3a84a67db910ce28a871273c992c3d7f9efb5Vendor (CNA)
Linux Linuxdcb4d14268595065c85dc5528056713928e17243Vendor (CNA)
debian:linux6.1.82-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2022-43945516 days apartThe Linux kernel NFSD implementation prior to versions 5.19.17 and 6.0.2 are vulnerable to buffer overflow.
    37Monitor
  • CVE-2021-4694336 days apartmedia: staging/intel-ipu3: Fix set_fmt error handling
    31Monitor
  • CVE-2024-43843136 days apartriscv, bpf: Fix out-of-bounds issue when preparing trampoline image
    31Monitor
  • CVE-2024-46729168 days apartdrm/amd/display: Fix incorrect size calculation for loop
    31Monitor
  • CVE-2022-4378454 days apartA stack overflow flaw was found in the Linux kernel's SYSCTL subsystem in how a user changes certain kernel parameters and variables.
    31Monitor
  • CVE-2023-45871171 days apartAn issue was discovered in drivers/net/ethernet/intel/igb/igb_main.c in the IGB driver in the Linux kernel before 6.5.3.
    30Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-131 · Incorrect Calculation of Buffer Size

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.

ATT&CK techniques

—

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