Red Hat Security Advisory: OpenShift Container Platform 4.20.25 bug fix and security update
Affects Red HatSource GCVE Database
Not known to be exploited · CVSS 9.8 Critical · fixed in Red Hat package updates : patch Red Hat as a priority.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 52% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in ea9f65b27c8404e164848ebff1443310fd187629, d6621f60192fe10c047a4487be42a6f4c150707f, a0c4ce9900a108eaf55d0f3b399cb55999647d39 +5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
Red Hat has released OpenShift Container Platform 4.20.25 containing the fix for CVE-2026-43037. Users should upgrade to this version using the OpenShift CLI (oc) or web console as soon as the update is available in their release channel. Detailed upgrade instructions are available in Red Hat's official documentation. No alternative mitigations or workarounds are specified, so applying the update is the recommended action.
Description
Red Hat OpenShift Container Platform 4.20.25 includes a critical security update addressing a kernel vulnerability identified as CVE-2026-43037. The flaw involves the ip6_tunnel component where skb2->cb[] is not cleared in the ip4ip6_err() function. This update fixes the issue by clearing this data structure to prevent potential security risks. Users of OpenShift Container Platform 4.20 are advised to upgrade to this release to mitigate the vulnerability.
References
- access.redhat.com/errata/RHSA-2026:25193 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2464351 (opens in a new tab)
- issues.redhat.com/browse/OCPBUGS-77834 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_25193.json (opens in a new tab)