8.8

CVE-2026-23098: linux Double Free

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2026-23098DEBIAN-CVE-2026-23098
Published 04-02-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-23098 is a high (CVSS 8.8) Double Free vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.20%
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 34 · Related 28
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1MGASA-2026-0097MGASA-2026-0098

Timeline

  1. 04-02-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netrom: fix double-free in nr_route_frame() In nr_route_frame(), old_skb is immediately freed without checking if nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL, the caller function will free old_skb again, causing a double-free bug. Therefore, to prevent this, we need to modify it to check whether nr_neigh->ax25 is NULL before freeing old_skb.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

+0.01 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.20%

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

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-176.186 | < 6.8.0-117.117
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1105.112 | < 6.8.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 25aab6bfc31017a7e52035b99aef5c2b6bde8ffb | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6e0110ea90313b7c0558a0b77038274a6821caf8 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7c48fdf2d1349bb54815b56fb012b9d577707708 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < bd8955337e3764f912f49b360e176d8aaecf7016 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9f5fa78d9980fe75a69835521627ab7943cb3d67 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ba1096c315283ee3292765f6aea4cca15816c4f7 | 2.6.12
  • linux_kernel≥ 2.6.12.1, < 5.10.249 | ≥ 5.11, < 5.15.199 | ≥ 5.16, < 6.1.162 | ≥ 6.2, < 6.6.122 | ≥ 6.7, < 6.12.68 | ≥ 6.13, < 6.18.8 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 159 products

References

40 links
Show all 40 references