CVE-2026-52998 - Vulnerability Details

- netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

Description

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

netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check

The nf_osf_ttl() function accessed skb->dev to perform a local interface
address lookup without verifying that the device pointer was valid.

Additionally, the implementation utilized an in_dev_for_each_ifa_rcu
loop to match the packet source address against local interface
addresses. It assumed that packets from the same subnet should not see a
decrement on the initial TTL. A packet might appear it is from the same
subnet but it actually isn't especially in modern environments with
containers and virtual switching.

Remove the device dereference and interface loop. Replace the logic with
a switch statement that evaluates the TTL according to the ttl_check.

Published: 2026-06-24

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

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
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< f4de0777e4554a7de19c920accde6319dd530782
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< c996a90f3071cf43683e5423da31aadbe002b8b4
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< edc806f9122961f0d3819f7c69c14cccde31f277
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< 5d05de2f0928d81309a815ecc76d1a3ad72cbc16
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< 95be653a76793856ff8b2d8bd82c2943c23f5ca8
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< 79b90a96688e521771fa6ed3dc7864b76b8df293
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< 83fc5dd63455a779ea2dd0f7ffee3c920919d80b
`11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384`	affected	< 711987ba281fd806322a7cd244e98e2a81903114

Linux

affected

Version	Status	Constraints
`2.6.31`	affected	—
`0`	unaffected	< 2.6.31
`5.10.258`	unaffected	≤ 5.10.*
`5.15.209`	unaffected	≤ 5.15.*
`6.1.175`	unaffected	≤ 6.1.*
`6.6.141`	unaffected	≤ 6.6.*
`6.12.91`	unaffected	≤ 6.12.*
`6.18.33`	unaffected	≤ 6.18.*
`7.0.10`	unaffected	≤ 7.0.*
`7.1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,f4de0777e4554a7de19c920accde6319dd530782)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,c996a90f3071cf43683e5423da31aadbe002b8b4)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,edc806f9122961f0d3819f7c69c14cccde31f277)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,5d05de2f0928d81309a815ecc76d1a3ad72cbc16)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,95be653a76793856ff8b2d8bd82c2943c23f5ca8)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,79b90a96688e521771fa6ed3dc7864b76b8df293)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,83fc5dd63455a779ea2dd0f7ffee3c920919d80b)`	affected	code_commit	—
`[11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384,711987ba281fd806322a7cd244e98e2a81903114)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.31`	affected	semver	—
`[0,2.6.31)`	unaffected	generic	—
`[5.10.258,5.11.0)`	unaffected	semver	—
`[5.15.209,5.16.0)`	unaffected	semver	—
`[6.1.175,6.2.0)`	unaffected	semver	—
`[6.6.141,6.7.0)`	unaffected	semver	—
`[6.12.91,6.13.0)`	unaffected	semver	—
`[6.18.33,6.19.0)`	unaffected	semver	—
`[7.0.10,7.1.0)`	unaffected	semver	—
`[7.1,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

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 None

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 0.00508.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16
https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114
https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293
https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b
https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8
https://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4
https://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277
https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782
https://lore.kernel.org/linux-cve-announce/2026062446-CVE-2026-52998-38ee@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-52998
https://www.cve.org/CVERecord?id=CVE-2026-52998

History

Sun, 28 Jun 2026 08:00:00 +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': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Fri, 26 Jun 2026 00:15:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2026062446-CVE-2026-52998-38ee@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-52998 https://www.cve.org/CVERecord?id=CVE-2026-52998
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, 24 Jun 2026 20:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476

Wed, 24 Jun 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.
Title		netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check
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/5d05de2f0928d81309a815ecc76d1a3ad72cbc16 https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114 https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293 https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8 https://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4 https://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277 https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-24T16:29:10.874Z

Updated: 2026-06-28T06:37:48.038Z

Reserved: 2026-06-09T07:44:35.377Z

Link: CVE-2026-52998

Vulnrichment

No data.

NVD

No data.

Redhat

Severity : Moderate

Publid Date: 2026-06-24T00:00:00Z

Links: CVE-2026-52998 - Bugzilla

OpenCVE Enrichment

Updated: 2026-06-28T15:15:05Z

Weaknesses

CWE-476

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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