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NVD / CVE Program· CNA Linux

CVE-2026-23442: ipv6: add NULL checks for idev in SRv6 paths

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: 0.13% (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 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4, 06413793526251870e20402c39930804f14d59c0, 50352fc103928e10e8729abc79a0d05abef26c4d; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4, 06413793526251870e20402c39930804f14d59c0, 50352fc103928e10e8729abc79a0d05abef26c4d; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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: ipv6: add NULL checks for idev in SRv6 paths __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 3, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 2th 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 · 0.1%

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.

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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 kernel4.10.1 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.19.10
  • linux linux kernel4.10
  • linux linux kernel7.0

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

    • 4.10affected
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 83d705d35e583cb1b1eacf196dfe7b77d442018eaffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before d1bd8b9edc6752d10f84d28ff64f842401ce336daffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 50352fc103928e10e8729abc79a0d05abef26c4daffected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before bc9843c39f9932a8b36efd1d362ea00bb88e4e78affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before c5cedee5d97382176573bbe21e1724e737a5eb64affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before a25853c9feea7bbf31d157ff6e004d2d3b4f7f13affected · git
    • 1ababeba4a21f3dba3da3523c670b207fb2feb62 and later · before 06413793526251870e20402c39930804f14d59c0affected · git
    • before 4.10not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1
Red Hat:enterprise_linux:10.2kernelbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64kbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debugbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-debuginfobefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-develbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-devel-matchedbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modulesbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modules-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debug-modules-extrabefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-debuginfobefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-develbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-devel-matchedbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modulesbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modules-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-64k-modules-extrabefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-abi-stablelistsbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-debugbefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2
Red Hat:enterprise_linux:10.2kernel-debug-corebefore 0:6.12.0-211.52.1.el10_20:6.12.0-211.52.1.el10_2

+96

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-2026-23440Apr 3, 2026 · net/mlx5e: Fix race condition during IPSec ESN update
    18Monitor
  • ← EarlierCVE-2026-23441Apr 3, 2026 · net/mlx5e: Prevent concurrent access to IPSec ASO context
    18Monitor
  • Later →CVE-2026-23444Apr 3, 2026 · wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure
    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 Linux0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4Vendor (CNA)
Linux Linux06413793526251870e20402c39930804f14d59c0Vendor (CNA)
Linux Linux50352fc103928e10e8729abc79a0d05abef26c4dVendor (CNA)
Linux Linux83d705d35e583cb1b1eacf196dfe7b77d442018eVendor (CNA)
Linux Linuxa25853c9feea7bbf31d157ff6e004d2d3b4f7f13Vendor (CNA)
Linux Linuxbc9843c39f9932a8b36efd1d362ea00bb88e4e78Vendor (CNA)
Linux Linuxc5cedee5d97382176573bbe21e1724e737a5eb64Vendor (CNA)
Linux Linuxd1bd8b9edc6752d10f84d28ff64f842401ce336dVendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:kernel0:6.12.0-211.52.1.el10_2 · Rocky Linux:10Package 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.

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).

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-476 · NULL Pointer Dereference

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records