7.5

CVE-2026-52998: linux NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2026-52998DEBIAN-CVE-2026-52998
Published 24-06-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-52998 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.58%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 50 · Related 50
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23221-1

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.01 pp

From 0.56% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu166 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < f4de0777e4554a7de19c920accde6319dd530782 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < c996a90f3071cf43683e5423da31aadbe002b8b4 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < edc806f9122961f0d3819f7c69c14cccde31f277 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < 5d05de2f0928d81309a815ecc76d1a3ad72cbc16 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < 95be653a76793856ff8b2d8bd82c2943c23f5ca8 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < 79b90a96688e521771fa6ed3dc7864b76b8df293 | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < 83fc5dd63455a779ea2dd0f7ffee3c920919d80b | ≥ 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384, < 711987ba281fd806322a7cd244e98e2a81903114 | 2.6.31
  • linux_kernel≥ 2.6.31, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.141 | ≥ 6.7, < 6.12.91 | ≥ 6.13, < 6.18.33 | ≥ 6.19, < 7.0.10
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.10-1

3 vendors · 169 products

References

52 links
Show all 52 references