CVE-2026-46266 - Vulnerability Details

- inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

Description

In the Linux kernel, the following vulnerability has been resolved:

inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP

Yizhou Zhao reported that simply having one RAW socket on protocol
IPPROTO_RAW (255) was dangerous.

socket(AF_INET, SOCK_RAW, 255);

A malicious incoming ICMP packet can set the protocol field to 255
and match this socket, leading to FNHE cache changes.

inner = IP(src="192.168.2.1", dst="8.8.8.8", proto=255)/Raw("TEST")
pkt = IP(src="192.168.1.1", dst="192.168.2.1")/ICMP(type=3, code=4, nexthopmtu=576)/inner

"man 7 raw" states:

A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able
to send any IP protocol that is specified in the passed header.
Receiving of all IP protocols via IPPROTO_RAW is not possible
using raw sockets.

Make sure we drop these malicious packets.

Published: 2026-06-03

Score: 9.1 Critical

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

In the Linux kernel, a raw socket bound to IPPROTO_RAW (protocol number 255) can erroneously accept ICMP packets that set the protocol field to 255. A crafted ICMP packet matching this value will be delivered to the socket and can trigger changes in the kernel's FNHE cache. The result is undefined kernel state changes, which may manifest as instability or other erratic behavior. This issue is classified as CWE‑1287 (Improper Access Control).

Affected Systems

All Linux kernel implementations are susceptible, as indicated by the CPE entries covering the generic linux_kernel and specific build versions such as 2.6.12 and its release candidates.

Risk and Exploitability

Exploitation is possible by an attacker who can send arbitrary ICMP packets to the target host. The CVSS score of 9.1 indicates high severity, while the EPSS value of < 1% suggests a low but non‑zero likelihood of exploitation. The vulnerability is not listed in CISA's KEV catalog. Attackers could be the external network or any host with the ability to craft ICMP packets directed at the vulnerable system.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< db76b75ede3810e7cf9cfea5067d4f3e0993768b
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 19e42490c89bac9a388f28179e66bebbef350f99
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 531c1aec81bfe19d00af13da5531fbb8209e4bd2
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< 719d3932b8f6e3348ce2f0ac58e278301fc17575
`1da177e4c3f41524e886b7f1b8a0c1fc7321cac2`	affected	< c89477ad79446867394360b29bb801010fc3ff22

Linux

affected

Version	Status	Constraints
`2.6.12`	affected	—
`0`	unaffected	< 2.6.12
`6.6.128`	unaffected	≤ 6.6.*
`6.12.75`	unaffected	≤ 6.12.*
`6.18.14`	unaffected	≤ 6.18.*
`6.19.4`	unaffected	≤ 6.19.*
`7.0`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::
	cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,db76b75ede3810e7cf9cfea5067d4f3e0993768b)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,19e42490c89bac9a388f28179e66bebbef350f99)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,531c1aec81bfe19d00af13da5531fbb8209e4bd2)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,719d3932b8f6e3348ce2f0ac58e278301fc17575)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,c89477ad79446867394360b29bb801010fc3ff22)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.12`	affected	semver	—
`[0,2.6.12)`	unaffected	semver	—
`[6.6.128,6.7.0)`	unaffected	semver	—
`[6.12.75,6.13.0)`	unaffected	semver	—
`[6.18.14,6.19.0)`	unaffected	semver	—
`[6.19.4,6.20.0)`	unaffected	semver	—
`[7.0,*]`	unaffected	semver	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Update the Linux kernel to a version that includes the patch fixing this flaw.
Discontinue or disable the use of raw sockets with IPPROTO_RAW (255) if they are not required for your environment.
Configure network or host‑based firewalls to block any incoming ICMP packets that contain a protocol value of 255.

Generated by OpenCVE AI on June 9, 2026 at 23:07 UTC.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00346.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99
https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2
https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575
https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22
https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b
https://lore.kernel.org/linux-cve-announce/2026060337-CVE-2026-46266-1e5e@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-46266
https://www.cve.org/CVERecord?id=CVE-2026-46266

History

Tue, 09 Jun 2026 20:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		NVD-CWE-noinfo
CPEs		cpe:2.3:o:linux:linux_kernel:2.6.12:-:::::: cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:::::: cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:::::: cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:::::: cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::

Fri, 05 Jun 2026 06:45:00 +0000

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}`

Thu, 04 Jun 2026 02:15:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-284

Thu, 04 Jun 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-1287
References		https://lore.kernel.org/linux-cve-announce/2026060337-CVE-2026-46266-1e5e@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-46266 https://www.cve.org/CVERecord?id=CVE-2026-46266
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Moderate`

Wed, 03 Jun 2026 19:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-284

Wed, 03 Jun 2026 17:45:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP Yizhou Zhao reported that simply having one RAW socket on protocol IPPROTO_RAW (255) was dangerous. socket(AF_INET, SOCK_RAW, 255); A malicious incoming ICMP packet can set the protocol field to 255 and match this socket, leading to FNHE cache changes. inner = IP(src="192.168.2.1", dst="8.8.8.8", proto=255)/Raw("TEST") pkt = IP(src="192.168.1.1", dst="192.168.2.1")/ICMP(type=3, code=4, nexthopmtu=576)/inner "man 7 raw" states: A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able to send any IP protocol that is specified in the passed header. Receiving of all IP protocols via IPPROTO_RAW is not possible using raw sockets. Make sure we drop these malicious packets.
Title		inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99 https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2 https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575 https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22 https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-03T15:50:07.907Z

Updated: 2026-06-05T06:06:39.945Z

Reserved: 2026-05-13T15:03:33.108Z

Link: CVE-2026-46266

Vulnrichment

No data.

NVD

Status : Analyzed

Published: 2026-06-03T18:16:28.147

Modified: 2026-06-09T19:47:18.280

Link: CVE-2026-46266

Redhat

Severity : Moderate

Publid Date: 2026-06-03T00:00:00Z

Links: CVE-2026-46266 - Bugzilla

OpenCVE Enrichment

Updated: 2026-06-09T23:15:16Z

Weaknesses

CWE-1287
Improper Validation of Specified Type of Input
NVD-CWE-noinfo

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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