5.5

CVE-2026-23442: ipv6: add NULL checks for idev in SRv6 paths

Modified
AliasesUBUNTU-CVE-2026-23442DEBIAN-CVE-2026-23442CGA-2428-5cm7-86q9
Published 03-04-2026Last modified 15-10-2026

Vulnerability summary

CVE-2026-23442 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 32 · Related 30
RHSA-2026:64775RHSA-2026:76739RHSA-2026:77219SUSE-SU-2026:21834-1SUSE-SU-2026:2238-1USN-8567-1

Timeline

  1. 03-04-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: add NULL checks for idev in SRv6 paths __in6_dev_get() can return NULL when the device has no IPv6 configuration (e.g. MTU < IPV6_MIN_MTU or after NETDEV_UNREGISTER). Add NULL checks for idev returned by __in6_dev_get() in both seg6_hmac_validate_skb() and ipv6_srh_rcv() to prevent potential NULL pointer dereferences.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.12% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard41 products
  • hyperv-daemons-6.18All versions (No fix recorded)
  • linux-aws-6.12< 6.12.85-r0
  • linux-aws-6.18All versions (No fix recorded) | < 6.18.25-r0
  • linux-aws-6.18-boot-installed< 6.18.25-r0
  • linux-aws-6.18-bootcAll versions (No fix recorded) | < 6.18.25-r0 | < 6.18.55-r0
Linux2 products
  • linux≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 0348fa0ada37cef7c6b5ab2a428bb2c6aee784e4 | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 83d705d35e583cb1b1eacf196dfe7b77d442018e | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < d1bd8b9edc6752d10f84d28ff64f842401ce336d | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 50352fc103928e10e8729abc79a0d05abef26c4d | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < bc9843c39f9932a8b36efd1d362ea00bb88e4e78 | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < c5cedee5d97382176573bbe21e1724e737a5eb64 | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < a25853c9feea7bbf31d157ff6e004d2d3b4f7f13 | ≥ 1ababeba4a21f3dba3da3523c670b207fb2feb62, < 06413793526251870e20402c39930804f14d59c0 | 4.10
  • linux_kernel≥ 4.10.1, < 6.12.83 | ≥ 6.13, < 6.19.10 | 4.10 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.10-1

4 vendors · 200 products

References

41 links
Show all 41 references