NVD / CVE Program· CNA Linux

CVE-2026-46172: ipv6: xfrm6: release dst on error in xfrm6_rcv_encap()

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 554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13, 6a5eec0a2a0e99ec9743cf8f1c4082178811d90a, 870560015ce6e0d8f841c6a8aba33c44be52c727; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13, 6a5eec0a2a0e99ec9743cf8f1c4082178811d90a, 870560015ce6e0d8f841c6a8aba33c44be52c727; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: ipv6: xfrm6: release dst on error in xfrm6_rcv_encap() xfrm6_rcv_encap() performs an IPv6 route lookup when the skb does not already have a dst attached. ip6_route_input_lookup() returns a referenced dst entry even when the lookup resolves to an error route. If dst->error is set, xfrm6_rcv_encap() drops the skb without attaching the dst to the skb and without releasing the reference returned by the lookup. Repeated packets hitting this path therefore leak dst entries. Release the dst before jumping to the drop path.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2026-15671

Published: May 28, 2026
Updated: Nov 6, 2026
EPSS: 0.1% · 2th percentile
CWE: —

Report tools

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Action score

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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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel5.8 and later · before 5.10.258
linux linux kernel5.11 and later · before 5.15.209
linux linux kernel5.16 and later · before 6.1.175
linux linux kernel6.2 and later · before 6.6.140
linux linux kernel6.7 and later · before 6.12.88
linux linux kernel6.13 and later · before 6.18.30
linux linux kernel6.19 and later · before 7.0.7
linux linux kernel7.1

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
- 5.8affected
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before a0721bcd72641c32b281f227a94505b31cf54117affected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before a20b34f6e854fe6f2aa82528fae7a88759919eb4affected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before 870560015ce6e0d8f841c6a8aba33c44be52c727affected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before c2efc4956981066df2fef1cc77391b523db6d8e4affected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before 554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13affected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before 9d5047782f9bd2829e529df69209bf3232eb561faffected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before 6a5eec0a2a0e99ec9743cf8f1c4082178811d90aaffected · git
- 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 and later · before bc0fcb9823cd0894934cf968b525c575833d7078affected · git
- before 5.8not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.88-1	6.12.88-1
Debian:14	linux	before 7.0.7-1	7.0.7-1

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-2026-46170May 28, 2026 · mptcp: pm: ADD_ADDR rtx: free sk if last
22Monitor
← EarlierCVE-2026-46171May 28, 2026 · riscv: kvm: fix vector context allocation leak
22Monitor
Later →CVE-2026-46173May 28, 2026 · exit: prevent preemption of oopsing TASK_DEAD task
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 / package	Fixed version	Source
Linux Linux	554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13	Vendor (CNA)
Linux Linux	6a5eec0a2a0e99ec9743cf8f1c4082178811d90a	Vendor (CNA)
Linux Linux	870560015ce6e0d8f841c6a8aba33c44be52c727	Vendor (CNA)
Linux Linux	9d5047782f9bd2829e529df69209bf3232eb561f	Vendor (CNA)
Linux Linux	a0721bcd72641c32b281f227a94505b31cf54117	Vendor (CNA)
Linux Linux	a20b34f6e854fe6f2aa82528fae7a88759919eb4	Vendor (CNA)
Linux Linux	bc0fcb9823cd0894934cf968b525c575833d7078	Vendor (CNA)
Linux Linux	c2efc4956981066df2fef1cc77391b523db6d8e4	Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.0	6.6.141.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · Debian:12	Package 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)

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)

—

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

SSVC exploitation— → noneNov 6, 2026, 6:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13

Show all references (10 more)

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

All records