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Vulnerability record · CVE-2026-52998 · published 24 June 2026

CVE-2026-52998: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.81% · top 45.0% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16 Patch
https://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114 Patch
https://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293 Patch
https://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b Patch
https://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8 Patch
https://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4 Patch
https://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277 Patch
https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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Source: NIST National Vulnerability Database (record CVE-2026-52998), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.