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NVD / CVE Program· CNA Linux

CVE-2024-26665: tunnels: fix out of bounds access when building IPv6 PMTU error

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.68% (FIRST EPSS); higher than 52.8% of all records.
  • 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 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1, 7dc9feb8b1705cf00de20563b6bc4831f4c99dab, d75abeec401f8c86b470e7028a13fcdc87e5dd06.
  • Severity is disputed: the assigning authority (CNA) scores it 9.1, NVD 7.1.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1, 7dc9feb8b1705cf00de20563b6bc4831f4c99dab, d75abeec401f8c86b470e7028a13fcdc87e5dd06 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: tunnels: fix out of bounds access when building IPv6 PMTU error If the ICMPv6 error is built from a non-linear skb we get the following splat, BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240 Read of size 4 at addr ffff88811d402c80 by task netperf/820 CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543 ... kasan_report+0xd8/0x110 do_csum+0x220/0x240 csum_partial+0xc/0x20 skb_tunnel_check_pmtu+0xeb9/0x3280 vxlan_xmit_one+0x14c2/0x4080 vxlan_xmit+0xf61/0x5c00 dev_hard_start_xmit+0xfb/0x510 __dev_queue_xmit+0x7cd/0x32a0 br_dev_queue_push_xmit+0x39d/0x6a0 Use skb_checksum instead of csum_partial who cannot deal with non-linear SKBs.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Apr 2, 2024
Updated
Aug 5, 2026
EPSS
0.6% · 52th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.1
CNA · Linux
9.1
2.0 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-2024-26665

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 kernel5.11 and later · before 5.15.149
  • linux linux kernel5.16 and later · before 6.1.78
  • linux linux kernel5.9 and later · before 5.10.210
  • linux linux kernel6.7 and later · before 6.7.5
  • linux linux kernel6.2 and later · before 6.6.17
  • 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

    • 5.9affected
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before e77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1daffected · git
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before d964dd1bc1452594b4207d9229c157d9386e5d8aaffected · git
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before e37cde7a5716466ff2a76f7f27f0a29b05b9a732affected · git
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 510c869ffa4068c5f19ff4df51d1e2f3a30aaac1affected · git
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before 7dc9feb8b1705cf00de20563b6bc4831f4c99dabaffected · git
    • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f and later · before d75abeec401f8c86b470e7028a13fcdc87e5dd06affected · git
    • before 5.9not affected · semver
    • 5.10.210 and later · up to and including 5.10.*not affected · semver
    • 5.15.149 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.17.1.150600.12.6.26.4.0-150600.23.17.1.150600.12.6.2
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.17.36.4.0-150600.23.17.3
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.17.16.4.0-150600.23.17.1
Red Hat:rhel_eus:8.8::baseosbpftoolbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseosbpftool-debuginfobefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernelbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-abi-stablelistsbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-corebefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debugbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-corebefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-debuginfobefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-develbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8
Red Hat:rhel_eus:8.8::baseoskernel-debug-modulesbefore 0:4.18.0-477.74.1.el8_80:4.18.0-477.74.1.el8_8

+33

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-2024-26663Apr 2, 2024 · tipc: Check the bearer type before calling tipc_udp_nl_bearer_add()
    22Monitor
  • ← EarlierCVE-2024-26664Apr 2, 2024 · hwmon: (coretemp) Fix out-of-bounds memory access
    28Monitor
  • Later →CVE-2024-26666Apr 2, 2024 · wifi: mac80211: fix RCU use in TDLS fast-xmit
    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 Linux510c869ffa4068c5f19ff4df51d1e2f3a30aaac1Vendor (CNA)
Linux Linux7dc9feb8b1705cf00de20563b6bc4831f4c99dabVendor (CNA)
Linux Linuxd75abeec401f8c86b470e7028a13fcdc87e5dd06Vendor (CNA)
Linux Linuxd964dd1bc1452594b4207d9229c157d9386e5d8aVendor (CNA)
Linux Linuxe37cde7a5716466ff2a76f7f27f0a29b05b9a732Vendor (CNA)
Linux Linuxe77bf828f1ca1c47fcff58bdc26b60a9d3dfbe1dVendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.17.1.150600.12.6.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-docs6.4.0-150600.23.17.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-kvmsmall6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-build6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-obs-qa6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-zfcpdump6.4.0-150600.23.17.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:bpftool0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-477.74.1.el8_8 · Red Hat:rhel_eus:8.8::baseosPackage registry (OSV)

+10

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.

No nightly-computed relations.

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 (6 more)

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

All records