Red Hat Bug Fix Advisory: OpenShift Container Platform 4.21.17 packages update

Fixed packages 133

Vulnerabilities 2

• High 7.8
  CVE-2026-46300 Exploited Public exploit EPSS 16%

  net: skbuff: preserve shared-frag marker during coalescing

  In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain t…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 23, 2026

  KEV Oct 28, 2026
• High 8.8
  CVE-2026-43503 Public exploit

  net: skbuff: propagate shared-frag marker through frag-transfer helpers

  In the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker through frag-transfer helpers Two frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shi…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 23, 2026

References

• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhba-2026_20032.json
• report
  https://access.redhat.com/security/cve/CVE-2026-43503
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480902
• article
  https://access.redhat.com/security/vulnerabilities/RHSB-2026-003
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43503
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43503
• article
  https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43503.mbox
• report
  https://access.redhat.com/security/cve/CVE-2026-46300
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2477015
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-46300
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-46300
• article
  https://www.cisa.gov/known-exploited-vulnerabilities-catalog